Begin switching to JSpecify annotations (#11448)

* Begin switching to JSpecify annotations

* more

* fixes

patches/api/0002-Build-system-changes.patch

@@ -5,10 +5,10 @@ Subject: [PATCH] Build system changes
 
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 6271e2bad0ed937c2c46a8c8fdf186c46b0b620e..a918fd14c95e714e935758d60bccd72755e00b11 100644
+index 6271e2bad0ed937c2c46a8c8fdf186c46b0b620e..2e99ea99cfc96b3602ba26b20a402e7d30f0f05f 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
-@@ -18,15 +18,26 @@ dependencies {
+@@ -18,15 +18,27 @@ dependencies {
      api("net.md-5:bungeecord-chat:$bungeeCordChatVersion")
      api("org.yaml:snakeyaml:2.2")
      api("org.joml:joml:1.10.5")
@@ -32,11 +32,12 @@ index 6271e2bad0ed937c2c46a8c8fdf186c46b0b620e..a918fd14c95e714e935758d60bccd727
 +    compileOnlyApi(checkerQual)
 +    testCompileOnly(checkerQual)
 +    // Paper end
++    api("org.jspecify:jspecify:1.0.0") // Paper - add jspecify
 +
      testImplementation("org.apache.commons:commons-lang3:3.12.0")
      testImplementation("org.junit.jupiter:junit-jupiter:5.10.2")
      testImplementation("org.hamcrest:hamcrest:2.2")
-@@ -69,8 +80,12 @@ tasks.withType<Javadoc> {
+@@ -69,8 +81,12 @@ tasks.withType<Javadoc> {
      options.links(
          "https://guava.dev/releases/32.1.2-jre/api/docs/",
          "https://javadoc.io/doc/org.yaml/snakeyaml/2.2/",
@@ -50,7 +51,7 @@ index 6271e2bad0ed937c2c46a8c8fdf186c46b0b620e..a918fd14c95e714e935758d60bccd727
      )
      options.tags("apiNote:a:API Note:")
  
-@@ -89,3 +104,14 @@ tasks.withType<Javadoc> {
+@@ -89,3 +105,14 @@ tasks.withType<Javadoc> {
  tasks.test {
      useJUnitPlatform()
  }

patches/api/0003-Test-changes.patch

@@ -12,10 +12,10 @@ Co-authored-by: Riley Park <rileysebastianpark@gmail.com>
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index a918fd14c95e714e935758d60bccd72755e00b11..768024b2b4584fd7dd86f068c0e79c89ffc5faa1 100644
+index 2e99ea99cfc96b3602ba26b20a402e7d30f0f05f..d91ce069b5fce4afb245691bd90f448d6dfdc492 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
-@@ -105,6 +105,12 @@ tasks.test {
+@@ -106,6 +106,12 @@ tasks.test {
      useJUnitPlatform()
  }
  
@@ -66,7 +66,7 @@ index 0000000000000000000000000000000000000000..77154095cfb8b259bdb318e8ff40cb6f
 +    }
 +}
 diff --git a/src/test/java/org/bukkit/AnnotationTest.java b/src/test/java/org/bukkit/AnnotationTest.java
-index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9d6888609 100644
+index 64e7aef6220097edefdff3b98a771b988365930d..7ff939ea41417bad3a436a87c89d5efa7ecefe86 100644
 --- a/src/test/java/org/bukkit/AnnotationTest.java
 +++ b/src/test/java/org/bukkit/AnnotationTest.java
 @@ -29,7 +29,13 @@ public class AnnotationTest {
@@ -103,7 +103,19 @@ index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9
      };
  
      @Test
-@@ -67,14 +83,48 @@ public class AnnotationTest {
+@@ -61,20 +77,60 @@ public class AnnotationTest {
+                 continue;
+             }
+ 
++            // Paper start - skip class if it's @NullMarked
++            if (isClassNullMarked(clazz)) {
++                return;
++            }
++            // Paper end - skip class if it's @NullMarked
++
+             for (MethodNode method : clazz.methods) {
+                 if (!isMethodIncluded(clazz, method, foundClasses)) {
+                     continue;
                  }
  
                  if (mustBeAnnotated(Type.getReturnType(method.desc)) && !isWellAnnotated(method.invisibleAnnotations)) {
@@ -152,7 +164,7 @@ index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9
                          ParameterNode paramNode = parameters == null ? null : parameters.get(i);
                          String paramName = paramNode == null ? null : paramNode.name;
  
-@@ -91,13 +141,18 @@ public class AnnotationTest {
+@@ -91,13 +147,18 @@ public class AnnotationTest {
  
          Collections.sort(errors);
  
@@ -175,7 +187,20 @@ index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9
      }
  
      private static void collectClasses(@NotNull File from, @NotNull Map<String, ClassNode> to) throws IOException {
-@@ -140,6 +195,11 @@ public class AnnotationTest {
+@@ -125,6 +186,12 @@ public class AnnotationTest {
+         }
+     }
+ 
++    // Paper start - skip class if it's @NullMarked
++    private static boolean isClassNullMarked(@NotNull ClassNode clazz) {
++        return clazz.visibleAnnotations != null && clazz.visibleAnnotations.stream().anyMatch(node -> "Lorg/jspecify/annotations/NullMarked;".equals(node.desc));
++    }
++    // Paper end - skip class if it's @NullMarked
++
+     private static boolean isClassIncluded(@NotNull ClassNode clazz, @NotNull Map<String, ClassNode> allClasses) {
+         // Exclude private, synthetic or deprecated classes and annotations, since their members can't be null
+         if ((clazz.access & (Opcodes.ACC_PRIVATE | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_DEPRECATED | Opcodes.ACC_ANNOTATION)) != 0) {
+@@ -140,6 +207,11 @@ public class AnnotationTest {
              // Exceptions are excluded
              return false;
          }
@@ -187,7 +212,7 @@ index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9
  
          for (String excludedClass : EXCLUDED_CLASSES) {
              if (excludedClass.equals(clazz.name)) {
-@@ -152,7 +212,7 @@ public class AnnotationTest {
+@@ -152,7 +224,7 @@ public class AnnotationTest {
  
      private static boolean isMethodIncluded(@NotNull ClassNode clazz, @NotNull MethodNode method, @NotNull Map<String, ClassNode> allClasses) {
          // Exclude private, synthetic and deprecated methods
@@ -196,7 +221,7 @@ index 64e7aef6220097edefdff3b98a771b988365930d..d9091ba1e5a55e03adca98305233cce9
              return false;
          }
  
-@@ -170,11 +230,30 @@ public class AnnotationTest {
+@@ -170,11 +242,30 @@ public class AnnotationTest {
          if ("<init>".equals(method.name) && isAnonymous(clazz)) {
              return false;
          }

patches/api/0004-Code-Generation.patch

@@ -7,7 +7,7 @@ Currently includes generated key holder classes for types
 used in the Registry Modification API
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 768024b2b4584fd7dd86f068c0e79c89ffc5faa1..f11a22ab01e97e51619c96f2d8a78a99297efc59 100644
+index d91ce069b5fce4afb245691bd90f448d6dfdc492..f715ae19c1e71d854a722130d3db447887fa2d2b 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -1,6 +1,7 @@
@@ -18,7 +18,7 @@ index 768024b2b4584fd7dd86f068c0e79c89ffc5faa1..f11a22ab01e97e51619c96f2d8a78a99
  }
  
  java {
-@@ -45,6 +46,22 @@ dependencies {
+@@ -46,6 +47,22 @@ dependencies {
      testImplementation("org.ow2.asm:asm-tree:9.7")
  }
  
@@ -41,7 +41,7 @@ index 768024b2b4584fd7dd86f068c0e79c89ffc5faa1..f11a22ab01e97e51619c96f2d8a78a99
  configure<PublishingExtension> {
      publications.create<MavenPublication>("maven") {
          from(components["java"])
-@@ -121,3 +138,14 @@ tasks.check {
+@@ -122,3 +139,14 @@ tasks.check {
      dependsOn(scanJar)
  }
  // Paper end

patches/api/0006-Adventure.patch

@@ -8,7 +8,7 @@ Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 Co-authored-by: Yannick Lamprecht <yannicklamprecht@live.de>
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 2f266350a787a4cfdfda1b0e760bfb7604cac43c..af3514113abdf3f42c41f1e7ff0f930cc1a417f5 100644
+index 7470f18dc36c5e4357ce3bb936c4842066df9114..7624069435a9be6c4249a444db0bf1bf54691caa 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -11,12 +11,28 @@ java {
@@ -55,7 +55,7 @@ index 2f266350a787a4cfdfda1b0e760bfb7604cac43c..af3514113abdf3f42c41f1e7ff0f930c
      // Paper end
  
      compileOnly("org.apache.maven:maven-resolver-provider:3.9.6")
-@@ -99,14 +122,31 @@ tasks.withType<Javadoc> {
+@@ -100,14 +123,31 @@ tasks.withType<Javadoc> {
          "https://guava.dev/releases/32.1.2-jre/api/docs/",
          "https://javadoc.io/doc/org.yaml/snakeyaml/2.2/",
          "https://javadoc.io/doc/org.jetbrains/annotations/$annotationsVersion/", // Paper - we don't want Java 5 annotations

patches/api/0009-Paper-Plugins.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Paper Plugins
 
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index ed0b67ac322aa22b191cd35502ae5b4f20af19f8..258d7010d24c529c9bbc76cc26adf226c641ee58 100644
+index dd1e8d3fda7ae6e5f0dfc6a5293f1ac4eb5fd3f4..b88bf39df6fb920b2c802e7057468c1476d63778 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -52,7 +52,7 @@ dependencies {
@@ -17,7 +17,7 @@ index ed0b67ac322aa22b191cd35502ae5b4f20af19f8..258d7010d24c529c9bbc76cc26adf226
      compileOnly("org.apache.maven.resolver:maven-resolver-connector-basic:1.9.18")
      compileOnly("org.apache.maven.resolver:maven-resolver-transport-http:1.9.18")
  
-@@ -139,6 +139,7 @@ tasks.withType<Javadoc> {
+@@ -140,6 +140,7 @@ tasks.withType<Javadoc> {
          "https://jd.advntr.dev/text-serializer-plain/$adventureVersion/",
          "https://jd.advntr.dev/text-logger-slf4j/$adventureVersion/",
          // Paper end

patches/api/0018-Add-BeaconEffectEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add BeaconEffectEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/block/BeaconEffectEvent.java b/src/main/java/com/destroystokyo/paper/event/block/BeaconEffectEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1288f8f13
+index 0000000000000000000000000000000000000000..741d0e73bc635a545c94c4b1254cee8f41ba8925
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/block/BeaconEffectEvent.java
-@@ -0,0 +1,91 @@
+@@ -0,0 +1,88 @@
 +package com.destroystokyo.paper.event.block;
 +
 +import org.bukkit.block.Block;
@@ -19,11 +19,12 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.potion.PotionEffect;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a beacon effect is being applied to a player.
 + */
++@NullMarked
 +public class BeaconEffectEvent extends BlockEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,7 +36,7 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BeaconEffectEvent(@NotNull Block block, @NotNull PotionEffect effect, @NotNull Player player, boolean primary) {
++    public BeaconEffectEvent(final Block block, final PotionEffect effect, final Player player, final boolean primary) {
 +        super(block);
 +        this.effect = effect;
 +        this.player = player;
@@ -47,7 +48,6 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +     *
 +     * @return Potion effect
 +     */
-+    @NotNull
 +    public PotionEffect getEffect() {
 +        return this.effect;
 +    }
@@ -57,7 +57,7 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +     *
 +     * @param effect Potion effect
 +     */
-+    public void setEffect(@NotNull PotionEffect effect) {
++    public void setEffect(final PotionEffect effect) {
 +        this.effect = effect;
 +    }
 +
@@ -66,7 +66,6 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +     *
 +     * @return Affected player
 +     */
-+    @NotNull
 +    public Player getPlayer() {
 +        return this.player;
 +    }
@@ -86,17 +85,15 @@ index 0000000000000000000000000000000000000000..7270c1feece2dc15a4a0503c4bca93a1
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0031-Entity-AddTo-RemoveFrom-World-Events.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Entity AddTo/RemoveFrom World Events
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..1d8e3c93a139bba11affca74b742269f24300d2c
+index 0000000000000000000000000000000000000000..990b307801be996a4707d87e420b05ee25286d5b
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java
-@@ -0,0 +1,45 @@
+@@ -0,0 +1,43 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.World;
@@ -18,21 +18,22 @@ index 0000000000000000000000000000000000000000..1d8e3c93a139bba11affca74b742269f
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity is being added to the world for any reason (including a chunk loading).
 + * <p>
 + * Not to be confused with {@link CreatureSpawnEvent}
 + */
++@NullMarked
 +public class EntityAddToWorldEvent extends EntityEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final World world;
++    private final World world;
 +
 +    @ApiStatus.Internal
-+    public EntityAddToWorldEvent(@NotNull Entity entity, @NotNull World world) {
++    public EntityAddToWorldEvent(final Entity entity, final World world) {
 +        super(entity);
 +        this.world = world;
 +    }
@@ -40,27 +41,24 @@ index 0000000000000000000000000000000000000000..1d8e3c93a139bba11affca74b742269f
 +    /**
 +     * @return The world that the entity is being added to
 +     */
-+    @NotNull
 +    public World getWorld() {
 +        return this.world;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..d75e6a8334c7408ea8c3f155414fc14dc427f190
+index 0000000000000000000000000000000000000000..b7776c1e65c8140a1e800df56bda5bec5717b50e
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java
-@@ -0,0 +1,43 @@
+@@ -0,0 +1,41 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.World;
@@ -68,20 +66,21 @@ index 0000000000000000000000000000000000000000..d75e6a8334c7408ea8c3f155414fc14d
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity is being removed from a world for any reason (including a chunk unloading).
 + * Note: The entity is updated prior to this event being called, as such, the entity's world may not be equal to {@link #getWorld()}.
 + */
++@NullMarked
 +public class EntityRemoveFromWorldEvent extends EntityEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final World world;
++    private final World world;
 +
 +    @ApiStatus.Internal
-+    public EntityRemoveFromWorldEvent(@NotNull Entity entity, @NotNull World world) {
++    public EntityRemoveFromWorldEvent(final Entity entity, final World world) {
 +        super(entity);
 +        this.world = world;
 +    }
@@ -89,17 +88,14 @@ index 0000000000000000000000000000000000000000..d75e6a8334c7408ea8c3f155414fc14d
 +    /**
 +     * @return The world that the entity is being removed from
 +     */
-+    @NotNull
 +    public World getWorld() {
 +        return this.world;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0032-EntityPathfindEvent.patch

@@ -7,10 +7,10 @@ Fires when an Entity decides to start moving to a location.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityPathfindEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityPathfindEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee4b29e109
+index 0000000000000000000000000000000000000000..2dd25136d81624025244a82de119fbecd0d7224c
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityPathfindEvent.java
-@@ -0,0 +1,87 @@
+@@ -0,0 +1,83 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.Location;
@@ -19,8 +19,8 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when an Entity decides to start moving towards a location.
@@ -28,16 +28,17 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 + * This event does not fire for the entities actual movement. Only when it
 + * is choosing to start moving to a location.
 + */
++@NullMarked
 +public class EntityPathfindEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @Nullable private final Entity targetEntity;
++    private final @Nullable Entity targetEntity;
-+    @NotNull private final Location location;
++    private final Location location;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityPathfindEvent(@NotNull Entity entity, @NotNull Location location, @Nullable Entity targetEntity) {
++    public EntityPathfindEvent(final Entity entity, final Location location, final @Nullable Entity targetEntity) {
 +        super(entity);
 +        this.targetEntity = targetEntity;
 +        this.location = location;
@@ -48,7 +49,6 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 +     *
 +     * @return The Entity that is pathfinding.
 +     */
-+    @NotNull
 +    public Entity getEntity() {
 +        return this.entity;
 +    }
@@ -56,12 +56,11 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 +    /**
 +     * If the Entity is trying to pathfind to an entity, this is the entity in relation.
 +     * <br>
-+     * Otherwise this will return {@code null}.
++     * Otherwise, this will return {@code null}.
 +     *
 +     * @return The entity target or {@code null}
 +     */
-+    @Nullable
++    public @Nullable Entity getTargetEntity() {
-+    public Entity getTargetEntity() {
 +        return this.targetEntity;
 +    }
 +
@@ -72,7 +71,6 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 +     *
 +     * @return Location of where the entity is trying to pathfind to.
 +     */
-+    @NotNull
 +    public Location getLoc() {
 +        return this.location.clone();
 +    }
@@ -83,17 +81,15 @@ index 0000000000000000000000000000000000000000..8267e8f1f0ade29a284831069e1268ee
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0036-Add-handshake-event-to-allow-plugins-to-handle-clien.patch

@@ -7,13 +7,14 @@ Subject: [PATCH] Add handshake event to allow plugins to handle client
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerHandshakeEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerHandshakeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4ce03ef477
+index 0000000000000000000000000000000000000000..aea04fb357f5728195fd9c9bdcd6304a0b953c45
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerHandshakeEvent.java
-@@ -0,0 +1,267 @@
+@@ -0,0 +1,257 @@
 +package com.destroystokyo.paper.event.player;
 +
 +import com.google.common.base.Preconditions;
++import java.util.UUID;
 +import net.kyori.adventure.text.Component;
 +import net.kyori.adventure.text.format.NamedTextColor;
 +import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
@@ -21,10 +22,8 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
-+
-+import java.util.UUID;
 +
 +/**
 + * This event is fired during a player handshake.
@@ -34,16 +33,17 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 + *
 + * <p>WARNING: TAMPERING WITH THIS EVENT CAN BE DANGEROUS</p>
 + */
++@NullMarked
 +public class PlayerHandshakeEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final String originalHandshake;
++    private final String originalHandshake;
-+    @NotNull private final String originalSocketAddressHostname;
++    private final String originalSocketAddressHostname;
-+    @Nullable private String serverHostname;
++    private @Nullable String serverHostname;
-+    @Nullable private String socketAddressHostname;
++    private @Nullable String socketAddressHostname;
-+    @Nullable private UUID uniqueId;
++    private @Nullable UUID uniqueId;
-+    @Nullable private String propertiesJson;
++    private @Nullable String propertiesJson;
 +    private boolean failed;
 +    private Component failMessage = Component.text("If you wish to use IP forwarding, please enable it in your BungeeCord config as well!", NamedTextColor.YELLOW);
 +
@@ -51,12 +51,12 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public PlayerHandshakeEvent(@NotNull String originalHandshake, boolean cancelled) {
++    public PlayerHandshakeEvent(final String originalHandshake, final boolean cancelled) {
 +        this(originalHandshake, "127.0.0.1", cancelled);
 +    }
 +
 +    @ApiStatus.Internal
-+    public PlayerHandshakeEvent(@NotNull String originalHandshake, @NotNull String originalSocketAddressHostname, boolean cancelled) {
++    public PlayerHandshakeEvent(final String originalHandshake, final String originalSocketAddressHostname, final boolean cancelled) {
 +        super(true);
 +        this.originalHandshake = originalHandshake;
 +        this.originalSocketAddressHostname = originalSocketAddressHostname;
@@ -85,7 +85,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     * @param cancel {@code true} if this event is cancelled, {@code false} otherwise
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
@@ -94,7 +94,6 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the original handshake string
 +     */
-+    @NotNull
 +    public String getOriginalHandshake() {
 +        return this.originalHandshake;
 +    }
@@ -107,7 +106,6 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the original socket address hostname
 +     */
-+    @NotNull
 +    public String getOriginalSocketAddressHostname() {
 +        return this.originalSocketAddressHostname;
 +    }
@@ -119,8 +117,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the server hostname string
 +     */
-+    @Nullable
++    public @Nullable String getServerHostname() {
-+    public String getServerHostname() {
 +        return this.serverHostname;
 +    }
 +
@@ -131,7 +128,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param serverHostname the server hostname string
 +     */
-+    public void setServerHostname(@NotNull String serverHostname) {
++    public void setServerHostname(final String serverHostname) {
 +        this.serverHostname = serverHostname;
 +    }
 +
@@ -142,8 +139,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the socket address hostname string
 +     */
-+    @Nullable
++    public @Nullable String getSocketAddressHostname() {
-+    public String getSocketAddressHostname() {
 +        return this.socketAddressHostname;
 +    }
 +
@@ -154,7 +150,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param socketAddressHostname the socket address hostname string
 +     */
-+    public void setSocketAddressHostname(@NotNull String socketAddressHostname) {
++    public void setSocketAddressHostname(final String socketAddressHostname) {
 +        this.socketAddressHostname = socketAddressHostname;
 +    }
 +
@@ -163,8 +159,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the unique id
 +     */
-+    @Nullable
++    public @Nullable UUID getUniqueId() {
-+    public UUID getUniqueId() {
 +        return this.uniqueId;
 +    }
 +
@@ -173,7 +168,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param uniqueId the unique id
 +     */
-+    public void setUniqueId(@NotNull UUID uniqueId) {
++    public void setUniqueId(final UUID uniqueId) {
 +        this.uniqueId = uniqueId;
 +    }
 +
@@ -184,8 +179,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the profile properties, as JSON
 +     */
-+    @Nullable
++    public @Nullable String getPropertiesJson() {
-+    public String getPropertiesJson() {
 +        return this.propertiesJson;
 +    }
 +
@@ -209,7 +203,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param failed {@code true} if authentication failed, {@code false} otherwise
 +     */
-+    public void setFailed(boolean failed) {
++    public void setFailed(final boolean failed) {
 +        this.failed = failed;
 +    }
 +
@@ -220,7 +214,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param propertiesJson the profile properties, as JSON
 +     */
-+    public void setPropertiesJson(@NotNull String propertiesJson) {
++    public void setPropertiesJson(final String propertiesJson) {
 +        this.propertiesJson = propertiesJson;
 +    }
 +
@@ -229,7 +223,6 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @return the message to display to the client
 +     */
-+    @NotNull
 +    public Component failMessage() {
 +        return this.failMessage;
 +    }
@@ -239,7 +232,7 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     *
 +     * @param failMessage the message to display to the client
 +     */
-+    public void failMessage(@NotNull Component failMessage) {
++    public void failMessage(final Component failMessage) {
 +        this.failMessage = failMessage;
 +    }
 +
@@ -249,7 +242,6 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     * @return the message to display to the client
 +     * @deprecated use {@link #failMessage()}
 +     */
-+    @NotNull
 +    @Deprecated
 +    public String getFailMessage() {
 +        return LegacyComponentSerializer.legacySection().serialize(this.failMessage());
@@ -262,18 +254,16 @@ index 0000000000000000000000000000000000000000..7c049bad187b94331f42f96833d1cf4c
 +     * @deprecated use {@link #failMessage(Component)}
 +     */
 +    @Deprecated
-+    public void setFailMessage(@NotNull String failMessage) {
++    public void setFailMessage(final String failMessage) {
 +        Preconditions.checkArgument(failMessage != null && !failMessage.isEmpty(), "fail message cannot be null or empty");
 +        this.failMessage(LegacyComponentSerializer.legacySection().deserialize(failMessage));
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0040-Add-EntityZapEvent.patch

@@ -6,34 +6,34 @@ Subject: [PATCH] Add EntityZapEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityZapEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityZapEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..dc6d15975a47e68c5bd939e68ddd2773028a6ac8
+index 0000000000000000000000000000000000000000..af2b1629f845ffe1559e7d580b482636cc6441d9
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityZapEvent.java
-@@ -0,0 +1,69 @@
+@@ -0,0 +1,65 @@
 +package com.destroystokyo.paper.event.entity;
 +
++import java.util.Collections;
 +import org.bukkit.entity.Entity;
 +import org.bukkit.entity.LightningStrike;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityTransformEvent;
-+
-+import java.util.Collections;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when lightning strikes an entity
 + */
++@NullMarked
 +public class EntityZapEvent extends EntityTransformEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final LightningStrike bolt;
++    private final LightningStrike bolt;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityZapEvent(@NotNull final Entity entity, @NotNull final LightningStrike bolt, @NotNull final Entity replacementEntity) {
++    public EntityZapEvent(final Entity entity, final LightningStrike bolt, final Entity replacementEntity) {
 +        super(entity, Collections.singletonList(replacementEntity), TransformReason.LIGHTNING);
 +        this.bolt = bolt;
 +    }
@@ -43,7 +43,6 @@ index 0000000000000000000000000000000000000000..dc6d15975a47e68c5bd939e68ddd2773
 +     *
 +     * @return The lightning bolt responsible for this event
 +     */
-+    @NotNull
 +    public LightningStrike getBolt() {
 +        return this.bolt;
 +    }
@@ -53,7 +52,6 @@ index 0000000000000000000000000000000000000000..dc6d15975a47e68c5bd939e68ddd2773
 +     *
 +     * @return The entity that will replace the struck entity
 +     */
-+    @NotNull
 +    public Entity getReplacementEntity() {
 +        return super.getTransformedEntity();
 +    }
@@ -64,17 +62,15 @@ index 0000000000000000000000000000000000000000..dc6d15975a47e68c5bd939e68ddd2773
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0061-Profile-Lookup-Events.patch

@@ -8,19 +8,18 @@ profiles that had to be looked up.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/profile/LookupProfileEvent.java b/src/main/java/com/destroystokyo/paper/event/profile/LookupProfileEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..2ad2782aafe76f8b10565c0f0419d6b9c665b267
+index 0000000000000000000000000000000000000000..9e8ae0ab13cac9a260c9959eb6bf5b93a3c15018
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/profile/LookupProfileEvent.java
-@@ -0,0 +1,48 @@
+@@ -0,0 +1,45 @@
 +package com.destroystokyo.paper.event.profile;
 +
 +import com.destroystokyo.paper.profile.PlayerProfile;
 +import org.bukkit.Bukkit;
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
-+
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Allows a plugin to be notified anytime AFTER a Profile has been looked up from the Mojang API
@@ -29,14 +28,15 @@ index 0000000000000000000000000000000000000000..2ad2782aafe76f8b10565c0f0419d6b9
 + * No guarantees are made about thread execution context for this event. If you need to know, check
 + * {@link Event#isAsynchronous()}
 + */
++@NullMarked
 +public class LookupProfileEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final PlayerProfile profile;
++    private final PlayerProfile profile;
 +
 +    @ApiStatus.Internal
-+    public LookupProfileEvent(@NotNull PlayerProfile profile) {
++    public LookupProfileEvent(final PlayerProfile profile) {
 +        super(!Bukkit.isPrimaryThread());
 +        this.profile = profile;
 +    }
@@ -44,41 +44,37 @@ index 0000000000000000000000000000000000000000..2ad2782aafe76f8b10565c0f0419d6b9
 +    /**
 +     * @return The profile that was recently looked up. This profile can be mutated
 +     */
-+    @NotNull
 +    public PlayerProfile getPlayerProfile() {
 +        return this.profile;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/profile/PreLookupProfileEvent.java b/src/main/java/com/destroystokyo/paper/event/profile/PreLookupProfileEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533dfa474356
+index 0000000000000000000000000000000000000000..07416cc9e2b8156be2cc92d6d974b881b427fd99
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/profile/PreLookupProfileEvent.java
-@@ -0,0 +1,112 @@
+@@ -0,0 +1,107 @@
 +package com.destroystokyo.paper.event.profile;
 +
 +import com.destroystokyo.paper.profile.ProfileProperty;
-+import org.bukkit.Bukkit;
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+
 +import java.util.HashSet;
 +import java.util.Set;
 +import java.util.UUID;
++import org.bukkit.Bukkit;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Allows a plugin to intercept a Profile Lookup for a Profile by name
@@ -90,17 +86,18 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 + * No guarantees are made about thread execution context for this event. If you need to know, check
 + * {@link Event#isAsynchronous()}
 + */
++@NullMarked
 +public class PreLookupProfileEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final String name;
++    private final String name;
 +
-+    private UUID uuid;
++    private @Nullable UUID uuid;
-+    @NotNull private Set<ProfileProperty> properties = new HashSet<>();
++    private Set<ProfileProperty> properties = new HashSet<>();
 +
 +    @ApiStatus.Internal
-+    public PreLookupProfileEvent(@NotNull String name) {
++    public PreLookupProfileEvent(final String name) {
 +        super(!Bukkit.isPrimaryThread());
 +        this.name = name;
 +    }
@@ -108,7 +105,6 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +    /**
 +     * @return Name of the profile
 +     */
-+    @NotNull
 +    public String getName() {
 +        return this.name;
 +    }
@@ -120,8 +116,7 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +     *
 +     * @return The UUID of the profile if it has already been provided by a plugin
 +     */
-+    @Nullable
++    public @Nullable UUID getUUID() {
-+    public UUID getUUID() {
 +        return this.uuid;
 +    }
 +
@@ -132,7 +127,7 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +     *
 +     * @param uuid the UUID to set for the profile or {@code null} to reset
 +     */
-+    public void setUUID(@Nullable UUID uuid) {
++    public void setUUID(final @Nullable UUID uuid) {
 +        this.uuid = uuid;
 +    }
 +
@@ -140,7 +135,6 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +     * @return The currently pending pre-populated properties.
 +     * Any property in this Set will be automatically prefilled on this Profile
 +     */
-+    @NotNull
 +    public Set<ProfileProperty> getProfileProperties() {
 +        return this.properties;
 +    }
@@ -151,7 +145,7 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +     *
 +     * @param properties The properties to add
 +     */
-+    public void setProfileProperties(@NotNull Set<ProfileProperty> properties) {
++    public void setProfileProperties(final Set<ProfileProperty> properties) {
 +        this.properties = new HashSet<>();
 +        this.properties.addAll(properties);
 +    }
@@ -162,17 +156,15 @@ index 0000000000000000000000000000000000000000..3f73ec52f9b581001bef3a19a5f1533d
 +     *
 +     * @param properties The properties to add
 +     */
-+    public void addProfileProperties(@NotNull Set<ProfileProperty> properties) {
++    public void addProfileProperties(final Set<ProfileProperty> properties) {
 +        this.properties.addAll(properties);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0067-Allow-plugins-to-use-SLF4J-for-logging.patch

@@ -14,7 +14,7 @@ it without having to shade it in the plugin and going through
 several layers of logging abstraction.
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 258d7010d24c529c9bbc76cc26adf226c641ee58..4da053d427f3f9c5e7fc144408836ebef80026c6 100644
+index b88bf39df6fb920b2c802e7057468c1476d63778..37ff4cb89dfb28eab6f836840ff1838d67895c1e 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -12,6 +12,8 @@ java {
@@ -35,7 +35,7 @@ index 258d7010d24c529c9bbc76cc26adf226c641ee58..4da053d427f3f9c5e7fc144408836ebe
  
      implementation("org.ow2.asm:asm:9.7")
      implementation("org.ow2.asm:asm-commons:9.7")
-@@ -138,6 +142,8 @@ tasks.withType<Javadoc> {
+@@ -139,6 +143,8 @@ tasks.withType<Javadoc> {
          "https://jd.advntr.dev/text-serializer-legacy/$adventureVersion/",
          "https://jd.advntr.dev/text-serializer-plain/$adventureVersion/",
          "https://jd.advntr.dev/text-logger-slf4j/$adventureVersion/",
@@ -45,7 +45,7 @@ index 258d7010d24c529c9bbc76cc26adf226c641ee58..4da053d427f3f9c5e7fc144408836ebe
          "https://javadoc.io/doc/org.apache.maven.resolver/maven-resolver-api/1.7.3", // Paper
      )
 diff --git a/src/main/java/org/bukkit/plugin/Plugin.java b/src/main/java/org/bukkit/plugin/Plugin.java
-index 8c76716249e44ed8bf6be94c1f5c7b6d9bb35be2..4eb639fbb46a0848be207149ea433455550fae1c 100644
+index 68a0ed5f0ed25e98f4ab4d1e482ec2ccfda9cd3a..46fc37a36403c8fbc4c0c9f863d4d57eb3896bd4 100644
 --- a/src/main/java/org/bukkit/plugin/Plugin.java
 +++ b/src/main/java/org/bukkit/plugin/Plugin.java
 @@ -198,6 +198,22 @@ public interface Plugin extends TabExecutor {

patches/api/0073-AsyncTabCompleteEvent.patch

@@ -17,10 +17,10 @@ Co-authored-by: Aikar <aikar@aikar.co>
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/server/AsyncTabCompleteEvent.java b/src/main/java/com/destroystokyo/paper/event/server/AsyncTabCompleteEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98d2e9595f
+index 0000000000000000000000000000000000000000..e2bfd86c964ce5a75470fef1ea7e031a95735fb3
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/server/AsyncTabCompleteEvent.java
-@@ -0,0 +1,339 @@
+@@ -0,0 +1,332 @@
 +/*
 + * Copyright (c) 2017 Daniel Ennis (Aikar) MIT License
 + *
@@ -48,6 +48,10 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +
 +import com.google.common.base.Preconditions;
 +import io.papermc.paper.util.TransformingRandomAccessList;
++import java.util.ArrayList;
++import java.util.List;
++import java.util.Objects;
++import java.util.stream.Stream;
 +import net.kyori.adventure.text.Component;
 +import net.kyori.examination.Examinable;
 +import net.kyori.examination.ExaminableProperty;
@@ -58,14 +62,9 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
-+
-+import java.util.ArrayList;
-+import java.util.List;
-+import java.util.Objects;
-+import java.util.stream.Stream;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Allows plugins to compute tab completion results asynchronously.
@@ -76,15 +75,15 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 + * <p>
 + * Only 1 process will be allowed to provide completions, the Async Event, or the standard process.
 + */
++@NullMarked
 +public class AsyncTabCompleteEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final CommandSender sender;
++    private final CommandSender sender;
-+    @NotNull private final String buffer;
++    private final String buffer;
 +    private final boolean isCommand;
-+    @Nullable
++    private final @Nullable Location location;
-+    private final Location location;
 +    private final List<Completion> completions = new ArrayList<>();
 +    private final List<String> stringCompletions = new TransformingRandomAccessList<>(
 +        this.completions,
@@ -95,7 +94,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public AsyncTabCompleteEvent(@NotNull CommandSender sender, @NotNull String buffer, boolean isCommand, @Nullable Location loc) {
++    public AsyncTabCompleteEvent(final CommandSender sender, final String buffer, final boolean isCommand, final @Nullable Location loc) {
 +        super(true);
 +        this.sender = sender;
 +        this.buffer = buffer;
@@ -105,7 +104,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public AsyncTabCompleteEvent(@NotNull CommandSender sender, @NotNull List<String> completions, @NotNull String buffer, boolean isCommand, @Nullable Location loc) {
++    public AsyncTabCompleteEvent(final CommandSender sender, final List<String> completions, final String buffer, final boolean isCommand, final @Nullable Location loc) {
 +        super(true);
 +        this.sender = sender;
 +        this.completions.addAll(fromStrings(completions));
@@ -119,7 +118,6 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @return the {@link CommandSender} instance
 +     */
-+    @NotNull
 +    public CommandSender getSender() {
 +        return this.sender;
 +    }
@@ -134,7 +132,6 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @return a list of offered completions
 +     */
-+    @NotNull
 +    public List<String> getCompletions() {
 +        return this.stringCompletions;
 +    }
@@ -149,7 +146,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @param completions the new completions
 +     */
-+    public void setCompletions(@NotNull List<String> completions) {
++    public void setCompletions(final List<String> completions) {
 +        Preconditions.checkArgument(completions != null, "Completions list cannot be null");
 +        if (completions == this.stringCompletions) {
 +            return;
@@ -168,7 +165,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @return a list of offered completions
 +     */
-+    public @NotNull List<Completion> completions() {
++    public List<Completion> completions() {
 +        return this.completions;
 +    }
 +
@@ -182,7 +179,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @param newCompletions the new completions
 +     */
-+    public void completions(final @NotNull List<Completion> newCompletions) {
++    public void completions(final List<Completion> newCompletions) {
 +        Preconditions.checkArgument(newCompletions != null, "new completions cannot be null");
 +        this.completions.clear();
 +        this.completions.addAll(newCompletions);
@@ -193,7 +190,6 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @return command buffer, as entered
 +     */
-+    @NotNull
 +    public String getBuffer() {
 +        return this.buffer;
 +    }
@@ -208,8 +204,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +    /**
 +     * @return The position looked at by the sender, or {@code null} if none
 +     */
-+    @Nullable
++    public @Nullable Location getLocation() {
-+    public Location getLocation() {
 +        return this.location != null ? this.location.clone() : null;
 +    }
 +
@@ -230,7 +225,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     *
 +     * @param handled if this completion should be marked as being handled
 +     */
-+    public void setHandled(boolean handled) {
++    public void setHandled(final boolean handled) {
 +        this.handled = handled;
 +    }
 +
@@ -245,21 +240,19 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +     * Will provide no completions, and will not fire the synchronous process
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
-+    private static @NotNull List<Completion> fromStrings(final @NotNull List<String> suggestions) {
++    private static List<Completion> fromStrings(final List<String> suggestions) {
 +        final List<Completion> list = new ArrayList<>(suggestions.size());
 +        for (final String suggestion : suggestions) {
 +            list.add(new CompletionImpl(suggestion, null));
@@ -277,7 +270,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +         *
 +         * @return suggestion string
 +         */
-+        @NotNull String suggestion();
++        String suggestion();
 +
 +        /**
 +         * Get the suggestion tooltip for this {@link Completion}.
@@ -287,7 +280,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +        @Nullable Component tooltip();
 +
 +        @Override
-+        default @NotNull Stream<? extends ExaminableProperty> examinableProperties() {
++        default Stream<? extends ExaminableProperty> examinableProperties() {
 +            return Stream.of(ExaminableProperty.of("suggestion", this.suggestion()), ExaminableProperty.of("tooltip", this.tooltip()));
 +        }
 +
@@ -297,7 +290,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +         * @param suggestion suggestion string
 +         * @return new completion instance
 +         */
-+        static @NotNull Completion completion(final @NotNull String suggestion) {
++        static Completion completion(final String suggestion) {
 +            return new CompletionImpl(suggestion, null);
 +        }
 +
@@ -310,7 +303,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +         * @param tooltip    tooltip component, or {@code null}
 +         * @return new completion instance
 +         */
-+        static @NotNull Completion completion(final @NotNull String suggestion, final @Nullable Component tooltip) {
++        static Completion completion(final String suggestion, final @Nullable Component tooltip) {
 +            return new CompletionImpl(suggestion, tooltip);
 +        }
 +    }
@@ -319,15 +312,15 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +    static final class CompletionImpl implements Completion {
 +
 +        private final String suggestion;
-+        private final Component tooltip;
++        private final @Nullable Component tooltip;
 +
-+        CompletionImpl(final @NotNull String suggestion, final @Nullable Component tooltip) {
++        CompletionImpl(final String suggestion, final @Nullable Component tooltip) {
 +            this.suggestion = suggestion;
 +            this.tooltip = tooltip;
 +        }
 +
 +        @Override
-+        public @NotNull String suggestion() {
++        public String suggestion() {
 +            return this.suggestion;
 +        }
 +
@@ -355,7 +348,7 @@ index 0000000000000000000000000000000000000000..8965974988ad20fbe1d45885f20a3a98
 +        }
 +
 +        @Override
-+        public @NotNull String toString() {
++        public String toString() {
 +            return StringExaminer.simpleEscaping().examine(this);
 +        }
 +    }
@@ -599,7 +592,7 @@ index 270e6d8ad4358baa256cee5f16cff281f063ce3b..6465e290c090d82986352d5ab7ba5dc6
  
      @Override
 diff --git a/src/test/java/org/bukkit/AnnotationTest.java b/src/test/java/org/bukkit/AnnotationTest.java
-index d9091ba1e5a55e03adca98305233cce9d6888609..b82f07a2879412f6b30643ca93a97439aa49a98a 100644
+index 65cca227207efb8177f3cdbcbff5fe0c3b8a563f..d3a2cb7cf1bc708002fa0b7a44c03ed53fc0c454 100644
 --- a/src/test/java/org/bukkit/AnnotationTest.java
 +++ b/src/test/java/org/bukkit/AnnotationTest.java
 @@ -48,6 +48,8 @@ public class AnnotationTest {

patches/api/0077-ExperienceOrb-merging-stacking-API.patch

@@ -12,10 +12,10 @@ Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/ExperienceOrbMergeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/ExperienceOrbMergeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..c520e5517861c4686806df233d1ef5e6bfb76ad3
+index 0000000000000000000000000000000000000000..5902e6d6c0516a1249c72b405a49dfc5cc490e0e
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/ExperienceOrbMergeEvent.java
-@@ -0,0 +1,91 @@
+@@ -0,0 +1,88 @@
 +/*
 + * Copyright (c) 2017 Daniel Ennis (Aikar) MIT License
 + *
@@ -46,22 +46,23 @@ index 0000000000000000000000000000000000000000..c520e5517861c4686806df233d1ef5e6
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired anytime the server is about to merge 2 experience orbs into one
 + */
++@NullMarked
 +public class ExperienceOrbMergeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final ExperienceOrb mergeTarget;
++    private final ExperienceOrb mergeTarget;
-+    @NotNull private final ExperienceOrb mergeSource;
++    private final ExperienceOrb mergeSource;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ExperienceOrbMergeEvent(@NotNull ExperienceOrb mergeTarget, @NotNull ExperienceOrb mergeSource) {
++    public ExperienceOrbMergeEvent(final ExperienceOrb mergeTarget, final ExperienceOrb mergeSource) {
 +        super(mergeTarget);
 +        this.mergeTarget = mergeTarget;
 +        this.mergeSource = mergeSource;
@@ -70,7 +71,6 @@ index 0000000000000000000000000000000000000000..c520e5517861c4686806df233d1ef5e6
 +    /**
 +     * @return The orb that will absorb the other experience orb
 +     */
-+    @NotNull
 +    public ExperienceOrb getMergeTarget() {
 +        return this.mergeTarget;
 +    }
@@ -78,7 +78,6 @@ index 0000000000000000000000000000000000000000..c520e5517861c4686806df233d1ef5e6
 +    /**
 +     * @return The orb that is subject to being removed and merged into the target orb
 +     */
-+    @NotNull
 +    public ExperienceOrb getMergeSource() {
 +        return this.mergeSource;
 +    }
@@ -92,17 +91,15 @@ index 0000000000000000000000000000000000000000..c520e5517861c4686806df233d1ef5e6
 +     * @param cancel {@code true} if you wish to cancel this event, and prevent the orbs from merging
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0079-PreCreatureSpawnEvent.patch

@@ -16,10 +16,10 @@ See: https://github.com/PaperMC/Paper/issues/917
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f93ffc2a4
+index 0000000000000000000000000000000000000000..c1c96f93a4a5450381cb5bdb198b056a37ba0fbe
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java
-@@ -0,0 +1,109 @@
+@@ -0,0 +1,105 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.Location;
@@ -29,7 +29,7 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * WARNING: This event only fires for a limited number of cases, and not for every case that {@link CreatureSpawnEvent} does.
@@ -41,19 +41,20 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 + * Currently: NATURAL and SPAWNER based reasons. <!-- Please submit a Pull Request for future additions. -->
 + * Also, Plugins that replace Entity Registrations with their own custom entities might not fire this event.
 + */
++@NullMarked
 +public class PreCreatureSpawnEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Location location;
++    private final Location location;
-+    @NotNull private final EntityType type;
++    private final EntityType type;
-+    @NotNull private final CreatureSpawnEvent.SpawnReason reason;
++    private final CreatureSpawnEvent.SpawnReason reason;
 +    private boolean shouldAbortSpawn;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PreCreatureSpawnEvent(@NotNull Location location, @NotNull EntityType type, @NotNull CreatureSpawnEvent.SpawnReason reason) {
++    public PreCreatureSpawnEvent(final Location location, final EntityType type, final CreatureSpawnEvent.SpawnReason reason) {
 +        this.location = location;
 +        this.type = type;
 +        this.reason = reason;
@@ -62,7 +63,6 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +    /**
 +     * @return The location this creature is being spawned at
 +     */
-+    @NotNull
 +    public Location getSpawnLocation() {
 +        return this.location.clone();
 +    }
@@ -70,7 +70,6 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +    /**
 +     * @return The type of creature being spawned
 +     */
-+    @NotNull
 +    public EntityType getType() {
 +        return this.type;
 +    }
@@ -78,7 +77,6 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +    /**
 +     * @return Reason this creature is spawning (ie, NATURAL vs SPAWNER)
 +     */
-+    @NotNull
 +    public CreatureSpawnEvent.SpawnReason getReason() {
 +        return this.reason;
 +    }
@@ -96,7 +94,7 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +     *
 +     * @param shouldAbortSpawn Set if the spawn process should be aborted vs trying more attempts
 +     */
-+    public void setShouldAbortSpawn(boolean shouldAbortSpawn) {
++    public void setShouldAbortSpawn(final boolean shouldAbortSpawn) {
 +        this.shouldAbortSpawn = shouldAbortSpawn;
 +    }
 +
@@ -114,17 +112,15 @@ index 0000000000000000000000000000000000000000..633ef4dcc701916f2dbfefbbebd5994f
 +     * @param cancel {@code true} if you wish to cancel this event, and abort the spawn of this creature
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0080-PlayerNaturallySpawnCreaturesEvent.patch

@@ -10,10 +10,10 @@ Also a highly more effecient way to blanket block spawns in a world
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PlayerNaturallySpawnCreaturesEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PlayerNaturallySpawnCreaturesEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7fcee73d61347165cefef7b92f0e63e0bed8ad73
+index 0000000000000000000000000000000000000000..a3267a283b39e8db1e9b7e5338d2909320f1421c
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/PlayerNaturallySpawnCreaturesEvent.java
-@@ -0,0 +1,66 @@
+@@ -0,0 +1,65 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Player;
@@ -21,11 +21,12 @@ index 0000000000000000000000000000000000000000..7fcee73d61347165cefef7b92f0e63e0
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when the server is calculating what chunks to try to spawn monsters in every Monster Spawn Tick event
 + */
++@NullMarked
 +public class PlayerNaturallySpawnCreaturesEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,7 +35,7 @@ index 0000000000000000000000000000000000000000..7fcee73d61347165cefef7b92f0e63e0
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PlayerNaturallySpawnCreaturesEvent(@NotNull Player player, byte radius) {
++    public PlayerNaturallySpawnCreaturesEvent(final Player player, final byte radius) {
 +        super(player);
 +        this.radius = radius;
 +    }
@@ -49,12 +50,12 @@ index 0000000000000000000000000000000000000000..7fcee73d61347165cefef7b92f0e63e0
 +    /**
 +     * @param radius The radius of chunks around this player to be included in natural spawn selection
 +     */
-+    public void setSpawnRadius(byte radius) {
++    public void setSpawnRadius(final byte radius) {
 +        this.radius = radius;
 +    }
 +
 +    /**
-+     * @return If this players chunks will be excluded from natural spawns
++     * @return If this player's chunks will be excluded from natural spawns
 +     */
 +    @Override
 +    public boolean isCancelled() {
@@ -62,20 +63,18 @@ index 0000000000000000000000000000000000000000..7fcee73d61347165cefef7b92f0e63e0
 +    }
 +
 +    /**
-+     * @param cancel {@code true} if you wish to cancel this event, and not include this players chunks for natural spawning
++     * @param cancel {@code true} if you wish to cancel this event, and not include this player's chunks for natural spawning
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0094-EndermanEscapeEvent.patch

@@ -9,10 +9,10 @@ You may cancel this, enabling ranged attacks to damage the enderman for example.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..f6be848c44d5efaca3fbc03c3be7451411943c24
+index 0000000000000000000000000000000000000000..ae72916972dbe86bfbca499eb7b6f97b1a6eae25
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
-@@ -0,0 +1,86 @@
+@@ -0,0 +1,83 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Enderman;
@@ -20,22 +20,22 @@ index 0000000000000000000000000000000000000000..f6be848c44d5efaca3fbc03c3be74514
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class EndermanEscapeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Reason reason;
++    private final Reason reason;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EndermanEscapeEvent(@NotNull Enderman entity, @NotNull Reason reason) {
++    public EndermanEscapeEvent(final Enderman entity, final Reason reason) {
 +        super(entity);
 +        this.reason = reason;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Enderman getEntity() {
 +        return (Enderman) super.getEntity();
@@ -44,7 +44,6 @@ index 0000000000000000000000000000000000000000..f6be848c44d5efaca3fbc03c3be74514
 +    /**
 +     * @return The reason the enderman is trying to escape
 +     */
-+    @NotNull
 +    public Reason getReason() {
 +        return this.reason;
 +    }
@@ -57,21 +56,19 @@ index 0000000000000000000000000000000000000000..f6be848c44d5efaca3fbc03c3be74514
 +    /**
 +     * Cancels the escape.
 +     * <p>
-+     * If this escape normally would of resulted in damage avoidance such as indirect,
++     * If this escape normally had resulted in damage avoidance such as indirect,
 +     * the enderman will now take damage.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0099-EndermanAttackPlayerEvent.patch

@@ -9,10 +9,10 @@ This allows you to override/extend the pumpkin/stare logic.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EndermanAttackPlayerEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EndermanAttackPlayerEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272743a8f35
+index 0000000000000000000000000000000000000000..b261e0420002da3f94862e664edc65536cd05fc8
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EndermanAttackPlayerEvent.java
-@@ -0,0 +1,101 @@
+@@ -0,0 +1,98 @@
 +/*
 + * Copyright (c) 2018 Daniel Ennis (Aikar) MIT License
 + *
@@ -44,7 +44,7 @@ index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an Enderman determines if it should attack a player or not.
@@ -52,15 +52,16 @@ index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272
 + * Starts off cancelled if the player is wearing a pumpkin head or is not looking
 + * at the Enderman, according to Vanilla rules.
 + */
++@NullMarked
 +public class EndermanAttackPlayerEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Player player;
++    private final Player player;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EndermanAttackPlayerEvent(@NotNull Enderman entity, @NotNull Player player) {
++    public EndermanAttackPlayerEvent(final Enderman entity, final Player player) {
 +        super(entity);
 +        this.player = player;
 +    }
@@ -70,7 +71,6 @@ index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272
 +     *
 +     * @return The enderman considering attacking
 +     */
-+    @NotNull
 +    @Override
 +    public Enderman getEntity() {
 +        return (Enderman) super.getEntity();
@@ -81,7 +81,6 @@ index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272
 +     *
 +     * @return The player the Enderman is considering attacking
 +     */
-+    @NotNull
 +    public Player getPlayer() {
 +        return this.player;
 +    }
@@ -100,16 +99,14 @@ index 0000000000000000000000000000000000000000..ae34e679723a2ef436da04c116038272
 +     * Cancels if the Enderman will attack this player
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0100-WitchConsumePotionEvent.patch

@@ -7,10 +7,10 @@ Fires when a witch consumes the potion in their hand
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/WitchConsumePotionEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/WitchConsumePotionEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..773079aa92280bb97e9b4c0e62d9ead08135610a
+index 0000000000000000000000000000000000000000..6476501ff3299686a059bb75a8ff2424db0cc7f8
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/WitchConsumePotionEvent.java
-@@ -0,0 +1,73 @@
+@@ -0,0 +1,70 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Witch;
@@ -19,26 +19,26 @@ index 0000000000000000000000000000000000000000..773079aa92280bb97e9b4c0e62d9ead0
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when a witch consumes the potion in their hand to buff themselves.
 + */
++@NullMarked
 +public class WitchConsumePotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @Nullable private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchConsumePotionEvent(@NotNull Witch witch, @Nullable ItemStack potion) {
++    public WitchConsumePotionEvent(final Witch witch, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -47,8 +47,7 @@ index 0000000000000000000000000000000000000000..773079aa92280bb97e9b4c0e62d9ead0
 +    /**
 +     * @return the potion the witch will consume and have the effects applied.
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -57,7 +56,7 @@ index 0000000000000000000000000000000000000000..773079aa92280bb97e9b4c0e62d9ead0
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -70,16 +69,14 @@ index 0000000000000000000000000000000000000000..773079aa92280bb97e9b4c0e62d9ead0
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0101-WitchThrowPotionEvent.patch

@@ -7,10 +7,10 @@ Fired when a witch throws a potion at a player
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/WitchThrowPotionEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/WitchThrowPotionEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f621ea043a
+index 0000000000000000000000000000000000000000..02395582b680f4baa3dc2251a8a79f41241b96ec
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/WitchThrowPotionEvent.java
-@@ -0,0 +1,85 @@
+@@ -0,0 +1,81 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.LivingEntity;
@@ -20,28 +20,28 @@ index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f6
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when a witch throws a potion at a player
 + */
++@NullMarked
 +public class WitchThrowPotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final LivingEntity target;
++    private final LivingEntity target;
-+    @Nullable private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchThrowPotionEvent(@NotNull Witch witch, @NotNull LivingEntity target, @Nullable ItemStack potion) {
++    public WitchThrowPotionEvent(final Witch witch, final LivingEntity target, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.target = target;
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -50,7 +50,6 @@ index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f6
 +    /**
 +     * @return The target of the potion
 +     */
-+    @NotNull
 +    public LivingEntity getTarget() {
 +        return this.target;
 +    }
@@ -58,8 +57,7 @@ index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f6
 +    /**
 +     * @return The potion the witch will throw at a player
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -68,7 +66,7 @@ index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f6
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -81,17 +79,15 @@ index 0000000000000000000000000000000000000000..f1d546a3576a170ecb3608e07befa0f6
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0104-WitchReadyPotionEvent.patch

@@ -7,10 +7,10 @@ Control what potion the witch readies to use
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/WitchReadyPotionEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/WitchReadyPotionEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7feca06e72bd585bbfa219df38a2161b77e8d4c4
+index 0000000000000000000000000000000000000000..bda48563cc9e00bd9a537ddec0c730b5e784c9a4
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/WitchReadyPotionEvent.java
-@@ -0,0 +1,68 @@
+@@ -0,0 +1,65 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Witch;
@@ -19,23 +19,23 @@ index 0000000000000000000000000000000000000000..7feca06e72bd585bbfa219df38a2161b
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
++@NullMarked
 +public class WitchReadyPotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchReadyPotionEvent(@NotNull Witch witch, @Nullable ItemStack potion) {
++    public WitchReadyPotionEvent(final Witch witch, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -44,8 +44,7 @@ index 0000000000000000000000000000000000000000..7feca06e72bd585bbfa219df38a2161b
 +    /**
 +     * @return the potion the witch is readying to use
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -54,7 +53,7 @@ index 0000000000000000000000000000000000000000..7feca06e72bd585bbfa219df38a2161b
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -64,17 +63,15 @@ index 0000000000000000000000000000000000000000..7feca06e72bd585bbfa219df38a2161b
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0106-Add-EntityTeleportEndGatewayEvent.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Add EntityTeleportEndGatewayEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityTeleportEndGatewayEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityTeleportEndGatewayEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..88b9c059f9d66877260c66496443ad0aefaf8f47
+index 0000000000000000000000000000000000000000..cea029bfbd526d21509dee69bbfad44323107cf2
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityTeleportEndGatewayEvent.java
 @@ -0,0 +1,33 @@
@@ -17,17 +17,18 @@ index 0000000000000000000000000000000000000000..88b9c059f9d66877260c66496443ad0a
 +import org.bukkit.entity.Entity;
 +import org.bukkit.event.entity.EntityTeleportEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity attempts to teleport in an end gateway
 + */
++@NullMarked
 +public class EntityTeleportEndGatewayEvent extends EntityTeleportEvent {
 +
-+    @NotNull private final EndGateway gateway;
++    private final EndGateway gateway;
 +
 +    @ApiStatus.Internal
-+    public EntityTeleportEndGatewayEvent(@NotNull Entity entity, @NotNull Location from, @NotNull Location to, @NotNull EndGateway gateway) {
++    public EntityTeleportEndGatewayEvent(final Entity entity, final Location from, final Location to, final EndGateway gateway) {
 +        super(entity, from, to);
 +        this.gateway = gateway;
 +    }
@@ -37,7 +38,6 @@ index 0000000000000000000000000000000000000000..88b9c059f9d66877260c66496443ad0a
 +     *
 +     * @return EndGateway used
 +     */
-+    @NotNull
 +    public EndGateway getGateway() {
 +        return this.gateway;
 +    }

patches/api/0111-Add-entity-knockback-events.patch

@@ -12,10 +12,10 @@ Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityKnockbackByEntityEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityKnockbackByEntityEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..beb1715e30ec476e3031c247285d0d3219e8a8ea
+index 0000000000000000000000000000000000000000..6f376e1ac0f2f44255993b3d5b144f5559d13cc3
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityKnockbackByEntityEvent.java
-@@ -0,0 +1,51 @@
+@@ -0,0 +1,52 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import io.papermc.paper.event.entity.EntityKnockbackEvent;
@@ -23,19 +23,20 @@ index 0000000000000000000000000000000000000000..beb1715e30ec476e3031c247285d0d32
 +import org.bukkit.entity.Entity;
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an Entity is knocked back by the hit of another Entity. The acceleration
 + * vector can be modified. If this event is cancelled, the entity is not knocked back.
 + */
++@NullMarked
 +public class EntityKnockbackByEntityEvent extends EntityPushedByEntityAttackEvent {
 +
 +    private final float knockbackStrength;
 +
 +    @ApiStatus.Internal
-+    public EntityKnockbackByEntityEvent(final @NonNull LivingEntity entity, final @NonNull Entity hitBy, final EntityKnockbackEvent.@NonNull Cause cause, final float knockbackStrength, final @NonNull Vector knockback) {
++    public EntityKnockbackByEntityEvent(final LivingEntity entity, final Entity hitBy, final EntityKnockbackEvent.Cause cause, final float knockbackStrength, final Vector knockback) {
 +        super(entity, cause, hitBy, knockback);
 +        this.knockbackStrength = knockbackStrength;
 +    }
@@ -44,7 +45,7 @@ index 0000000000000000000000000000000000000000..beb1715e30ec476e3031c247285d0d32
 +     * @return the entity which was knocked back
 +     */
 +    @Override
-+    public @NonNull LivingEntity getEntity() {
++    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
 +    }
 +
@@ -62,17 +63,17 @@ index 0000000000000000000000000000000000000000..beb1715e30ec476e3031c247285d0d32
 +     *
 +     * @return the Entity which hit
 +     */
-+    public @NonNull Entity getHitBy() {
++    public Entity getHitBy() {
 +        return super.getPushedBy();
 +    }
 +
 +}
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityKnockbackEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityKnockbackEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b103e03a6
+index 0000000000000000000000000000000000000000..bc120d4928dc41ea827e2a06f7d30d0e3d484ce0
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityKnockbackEvent.java
-@@ -0,0 +1,116 @@
+@@ -0,0 +1,117 @@
 +package io.papermc.paper.event.entity;
 +
 +import com.google.common.base.Preconditions;
@@ -81,14 +82,15 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity receives knockback.
 + * @see EntityPushedByEntityAttackEvent
 + * @see com.destroystokyo.paper.event.entity.EntityKnockbackByEntityEvent
 + */
++@NullMarked
 +public class EntityKnockbackEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -98,7 +100,7 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityKnockbackEvent(final @NonNull Entity entity, final EntityKnockbackEvent.@NonNull Cause cause, final @NonNull Vector knockback) {
++    public EntityKnockbackEvent(final Entity entity, final EntityKnockbackEvent.Cause cause, final Vector knockback) {
 +        super(entity);
 +        this.cause = cause;
 +        this.knockback = knockback;
@@ -109,7 +111,7 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +     *
 +     * @return the cause of the knockback
 +     */
-+    public EntityKnockbackEvent.@NonNull Cause getCause() {
++    public EntityKnockbackEvent.Cause getCause() {
 +        return this.cause;
 +    }
 +
@@ -121,7 +123,7 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +     *
 +     * @return the knockback
 +     */
-+    public @NonNull Vector getKnockback() {
++    public Vector getKnockback() {
 +        return this.knockback.clone();
 +    }
 +
@@ -130,7 +132,7 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +     *
 +     * @param knockback the knockback
 +     */
-+    public void setKnockback(final @NonNull Vector knockback) {
++    public void setKnockback(final Vector knockback) {
 +        Preconditions.checkArgument(knockback != null, "knockback");
 +        this.knockback = knockback.clone();
 +    }
@@ -146,11 +148,11 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +    }
 +
 +    @Override
-+    public @NonNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NonNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
@@ -191,17 +193,17 @@ index 0000000000000000000000000000000000000000..8aaafa4ea837f54b32497010d121f02b
 +}
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityPushedByEntityAttackEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityPushedByEntityAttackEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..b9d2a7a5bc4e67d8c36047da616046cbedce1d4a
+index 0000000000000000000000000000000000000000..7655c3694b9d6b37206fc46bf892004686e0a7dd
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityPushedByEntityAttackEvent.java
-@@ -0,0 +1,66 @@
+@@ -0,0 +1,67 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.Entity;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an entity is pushed by another entity's attack. The acceleration vector can be
@@ -210,12 +212,13 @@ index 0000000000000000000000000000000000000000..b9d2a7a5bc4e67d8c36047da616046cb
 + * Note: Some entities might trigger this multiple times on the same entity
 + * as multiple acceleration calculations are done.
 + */
++@NullMarked
 +public class EntityPushedByEntityAttackEvent extends EntityKnockbackEvent implements Cancellable {
 +
 +    private final Entity pushedBy;
 +
 +    @ApiStatus.Internal
-+    public EntityPushedByEntityAttackEvent(final @NonNull Entity entity, final EntityKnockbackEvent.@NonNull Cause cause, final @NonNull Entity pushedBy, final @NonNull Vector knockback) {
++    public EntityPushedByEntityAttackEvent(final Entity entity, final EntityKnockbackEvent.Cause cause, final Entity pushedBy, final Vector knockback) {
 +        super(entity, cause, knockback);
 +        this.pushedBy = pushedBy;
 +    }
@@ -225,7 +228,7 @@ index 0000000000000000000000000000000000000000..b9d2a7a5bc4e67d8c36047da616046cb
 +     *
 +     * @return the pushing entity
 +     */
-+    public @NonNull Entity getPushedBy() {
++    public Entity getPushedBy() {
 +        return this.pushedBy;
 +    }
 +
@@ -236,7 +239,7 @@ index 0000000000000000000000000000000000000000..b9d2a7a5bc4e67d8c36047da616046cb
 +     * @deprecated use {@link #getKnockback()}
 +     */
 +    @Deprecated(since = "1.20.6", forRemoval = true)
-+    public @NonNull Vector getAcceleration() {
++    public Vector getAcceleration() {
 +        return this.knockback; // TODO Clone in 1.21 to not instantly break what was technically already modifiable (call super.getKnockback())
 +    }
 +
@@ -247,7 +250,7 @@ index 0000000000000000000000000000000000000000..b9d2a7a5bc4e67d8c36047da616046cb
 +     * @deprecated use {@link #setKnockback(Vector)}
 +     */
 +    @Deprecated(since = "1.20.6", forRemoval = true)
-+    public void setAcceleration(final @NonNull Vector acceleration) {
++    public void setAcceleration(final Vector acceleration) {
 +        super.setKnockback(acceleration);
 +    }
 +

patches/api/0120-EnderDragon-Events.patch

@@ -6,36 +6,36 @@ Subject: [PATCH] EnderDragon Events
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFireballHitEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFireballHitEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..bf5f82c8ba36bd245e1536fd4f654487aa8f6e21
+index 0000000000000000000000000000000000000000..242eb9c07866365568c036819be2b4f882319aa1
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFireballHitEvent.java
-@@ -0,0 +1,79 @@
+@@ -0,0 +1,74 @@
 +package com.destroystokyo.paper.event.entity;
 +
++import java.util.Collection;
 +import org.bukkit.entity.AreaEffectCloud;
 +import org.bukkit.entity.DragonFireball;
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
-+
-+import java.util.Collection;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a DragonFireball collides with a block/entity and spawns an AreaEffectCloud
 + */
++@NullMarked
 +public class EnderDragonFireballHitEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Collection<LivingEntity> targets;
++    private final Collection<LivingEntity> targets;
-+    @NotNull private final AreaEffectCloud areaEffectCloud;
++    private final AreaEffectCloud areaEffectCloud;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonFireballHitEvent(@NotNull DragonFireball fireball, @NotNull Collection<LivingEntity> targets, @NotNull AreaEffectCloud areaEffectCloud) {
++    public EnderDragonFireballHitEvent(final DragonFireball fireball, final Collection<LivingEntity> targets, final AreaEffectCloud areaEffectCloud) {
 +        super(fireball);
 +        this.targets = targets;
 +        this.areaEffectCloud = areaEffectCloud;
@@ -44,7 +44,6 @@ index 0000000000000000000000000000000000000000..bf5f82c8ba36bd245e1536fd4f654487
 +    /**
 +     * The fireball involved in this event
 +     */
-+    @NotNull
 +    @Override
 +    public DragonFireball getEntity() {
 +        return (DragonFireball) super.getEntity();
@@ -55,7 +54,6 @@ index 0000000000000000000000000000000000000000..bf5f82c8ba36bd245e1536fd4f654487
 +     *
 +     * @return the targets
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getTargets() {
 +        return this.targets;
 +    }
@@ -63,7 +61,6 @@ index 0000000000000000000000000000000000000000..bf5f82c8ba36bd245e1536fd4f654487
 +    /**
 +     * @return The area effect cloud spawned in this collision
 +     */
-+    @NotNull
 +    public AreaEffectCloud getAreaEffectCloud() {
 +        return this.areaEffectCloud;
 +    }
@@ -74,27 +71,25 @@ index 0000000000000000000000000000000000000000..bf5f82c8ba36bd245e1536fd4f654487
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFlameEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFlameEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..4a61878152c95a07160f4216e78b042ca45d24b3
+index 0000000000000000000000000000000000000000..0d6409e3198e57dfa479abb6fee28d6028e13e2d
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonFlameEvent.java
-@@ -0,0 +1,63 @@
+@@ -0,0 +1,60 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.AreaEffectCloud;
@@ -103,20 +98,21 @@ index 0000000000000000000000000000000000000000..4a61878152c95a07160f4216e78b042c
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an EnderDragon spawns an AreaEffectCloud by shooting flames
 + */
++@NullMarked
 +public class EnderDragonFlameEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final AreaEffectCloud areaEffectCloud;
++    private final AreaEffectCloud areaEffectCloud;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonFlameEvent(@NotNull EnderDragon enderDragon, @NotNull AreaEffectCloud areaEffectCloud) {
++    public EnderDragonFlameEvent(final EnderDragon enderDragon, final AreaEffectCloud areaEffectCloud) {
 +        super(enderDragon);
 +        this.areaEffectCloud = areaEffectCloud;
 +    }
@@ -124,7 +120,6 @@ index 0000000000000000000000000000000000000000..4a61878152c95a07160f4216e78b042c
 +    /**
 +     * The enderdragon involved in this event
 +     */
-+    @NotNull
 +    @Override
 +    public EnderDragon getEntity() {
 +        return (EnderDragon) super.getEntity();
@@ -133,7 +128,6 @@ index 0000000000000000000000000000000000000000..4a61878152c95a07160f4216e78b042c
 +    /**
 +     * @return The area effect cloud spawned in this collision
 +     */
-+    @NotNull
 +    public AreaEffectCloud getAreaEffectCloud() {
 +        return this.areaEffectCloud;
 +    }
@@ -144,26 +138,24 @@ index 0000000000000000000000000000000000000000..4a61878152c95a07160f4216e78b042c
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonShootFireballEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonShootFireballEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..3c6c3db37d91aad3638aef107a3bf8ca1d4f7085
+index 0000000000000000000000000000000000000000..7dd6e17b648868cf5d549f1e779e5d92439751dd
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EnderDragonShootFireballEvent.java
-@@ -0,0 +1,64 @@
+@@ -0,0 +1,61 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.DragonFireball;
@@ -172,20 +164,21 @@ index 0000000000000000000000000000000000000000..3c6c3db37d91aad3638aef107a3bf8ca
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an EnderDragon shoots a fireball
 + */
++@NullMarked
 +public class EnderDragonShootFireballEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final DragonFireball fireball;
++    private final DragonFireball fireball;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonShootFireballEvent(@NotNull EnderDragon entity, @NotNull DragonFireball fireball) {
++    public EnderDragonShootFireballEvent(final EnderDragon entity, final DragonFireball fireball) {
 +        super(entity);
 +        this.fireball = fireball;
 +    }
@@ -193,7 +186,6 @@ index 0000000000000000000000000000000000000000..3c6c3db37d91aad3638aef107a3bf8ca
 +    /**
 +     * The enderdragon shooting the fireball
 +     */
-+    @NotNull
 +    @Override
 +    public EnderDragon getEntity() {
 +        return (EnderDragon) super.getEntity();
@@ -202,7 +194,6 @@ index 0000000000000000000000000000000000000000..3c6c3db37d91aad3638aef107a3bf8ca
 +    /**
 +     * @return The fireball being shot
 +     */
-+    @NotNull
 +    public DragonFireball getFireball() {
 +        return this.fireball;
 +    }
@@ -213,17 +204,15 @@ index 0000000000000000000000000000000000000000..3c6c3db37d91aad3638aef107a3bf8ca
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0124-SkeletonHorse-Additions.patch

@@ -6,26 +6,26 @@ Subject: [PATCH] SkeletonHorse Additions
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SkeletonHorseTrapEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SkeletonHorseTrapEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..f6724e6e5754996ac10888aaa92baf2dcc6134d3
+index 0000000000000000000000000000000000000000..a70f4972a012f955b45a91fe20ca5df7e2123528
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SkeletonHorseTrapEvent.java
-@@ -0,0 +1,68 @@
+@@ -0,0 +1,64 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import com.google.common.collect.ImmutableList;
++import java.util.List;
 +import org.bukkit.entity.HumanEntity;
 +import org.bukkit.entity.SkeletonHorse;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Event called when a player gets close to a skeleton horse and triggers the lightning trap
 + */
++@NullMarked
 +public class SkeletonHorseTrapEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,23 +35,21 @@ index 0000000000000000000000000000000000000000..f6724e6e5754996ac10888aaa92baf2d
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public SkeletonHorseTrapEvent(@NotNull SkeletonHorse horse) {
++    public SkeletonHorseTrapEvent(final SkeletonHorse horse) {
 +        this(horse, ImmutableList.of());
 +    }
 +
 +    @ApiStatus.Internal
-+    public SkeletonHorseTrapEvent(@NotNull SkeletonHorse horse, @NotNull List<HumanEntity> eligibleHumans) {
++    public SkeletonHorseTrapEvent(final SkeletonHorse horse, final List<HumanEntity> eligibleHumans) {
 +        super(horse);
 +        this.eligibleHumans = eligibleHumans;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public SkeletonHorse getEntity() {
 +        return (SkeletonHorse) super.getEntity();
 +    }
 +
-+    @NotNull
 +    public List<HumanEntity> getEligibleHumans() {
 +        return this.eligibleHumans;
 +    }
@@ -62,17 +60,15 @@ index 0000000000000000000000000000000000000000..f6724e6e5754996ac10888aaa92baf2d
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0127-AnvilDamageEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] AnvilDamageEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/block/AnvilDamagedEvent.java b/src/main/java/com/destroystokyo/paper/event/block/AnvilDamagedEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816337666d7
+index 0000000000000000000000000000000000000000..456e2a638421b435ede4205d3eedfafeedb196c1
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/block/AnvilDamagedEvent.java
-@@ -0,0 +1,154 @@
+@@ -0,0 +1,148 @@
 +package com.destroystokyo.paper.event.block;
 +
 +import org.bukkit.Material;
@@ -20,12 +20,13 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +import org.bukkit.inventory.AnvilInventory;
 +import org.bukkit.inventory.InventoryView;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an anvil is damaged from being used
 + */
++@NullMarked
 +public class AnvilDamagedEvent extends InventoryEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,12 +35,11 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public AnvilDamagedEvent(@NotNull InventoryView inventory, @Nullable BlockData blockData) {
++    public AnvilDamagedEvent(final InventoryView inventory, final @Nullable BlockData blockData) {
 +        super(inventory);
 +        this.damageState = DamageState.getState(blockData);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public AnvilInventory getInventory() {
 +        return (AnvilInventory) super.getInventory();
@@ -50,7 +50,6 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +     *
 +     * @return Damage state
 +     */
-+    @NotNull
 +    public DamageState getDamageState() {
 +        return this.damageState;
 +    }
@@ -60,7 +59,7 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +     *
 +     * @param damageState Damage state
 +     */
-+    public void setDamageState(@NotNull DamageState damageState) {
++    public void setDamageState(final DamageState damageState) {
 +        this.damageState = damageState;
 +    }
 +
@@ -78,7 +77,7 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +     *
 +     * @param breaking {@code true} if breaking
 +     */
-+    public void setBreaking(boolean breaking) {
++    public void setBreaking(final boolean breaking) {
 +        if (breaking) {
 +            this.damageState = DamageState.BROKEN;
 +        } else if (this.damageState == DamageState.BROKEN) {
@@ -92,16 +91,14 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -117,7 +114,7 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +
 +        private final Material material;
 +
-+        DamageState(@NotNull Material material) {
++        DamageState(final Material material) {
 +            this.material = material;
 +        }
 +
@@ -126,7 +123,6 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +         *
 +         * @return Material
 +         */
-+        @NotNull
 +        public Material getMaterial() {
 +            return this.material;
 +        }
@@ -138,8 +134,7 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +         * @return DamageState
 +         * @throws IllegalArgumentException If non anvil block data is given
 +         */
-+        @NotNull
++        public static DamageState getState(final @Nullable BlockData blockData) {
-+        public static DamageState getState(@Nullable BlockData blockData) {
 +            return blockData == null ? BROKEN : getState(blockData.getMaterial());
 +        }
 +
@@ -150,12 +145,11 @@ index 0000000000000000000000000000000000000000..4f88c101d81e5c3a8a065260304d5816
 +         * @return DamageState
 +         * @throws IllegalArgumentException If non anvil material is given
 +         */
-+        @NotNull
++        public static DamageState getState(final @Nullable Material material) {
-+        public static DamageState getState(@Nullable Material material) {
 +            if (material == null) {
 +                return BROKEN;
 +            }
-+            for (DamageState state : values()) {
++            for (final DamageState state : values()) {
 +                if (state.getMaterial() == material) {
 +                    return state;
 +                }

patches/api/0133-Slime-Pathfinder-Events.patch

@@ -6,15 +6,15 @@ Subject: [PATCH] Slime Pathfinder Events
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SlimeChangeDirectionEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SlimeChangeDirectionEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..30864539574e23bbe9e4c5dc73ad6614de782ac2
+index 0000000000000000000000000000000000000000..a5d4442b53c4bd70165c3240c7dbd3d56b6bf0ae
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SlimeChangeDirectionEvent.java
-@@ -0,0 +1,40 @@
+@@ -0,0 +1,41 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to change its facing direction.
@@ -22,12 +22,13 @@ index 0000000000000000000000000000000000000000..30864539574e23bbe9e4c5dc73ad6614
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to change direction.
 + */
++@NullMarked
 +public class SlimeChangeDirectionEvent extends SlimePathfindEvent {
 +
 +    private float yaw;
 +
 +    @ApiStatus.Internal
-+    public SlimeChangeDirectionEvent(@NotNull Slime slime, float yaw) {
++    public SlimeChangeDirectionEvent(final Slime slime, final float yaw) {
 +        super(slime);
 +        this.yaw = yaw;
 +    }
@@ -46,16 +47,16 @@ index 0000000000000000000000000000000000000000..30864539574e23bbe9e4c5dc73ad6614
 +     *
 +     * @param yaw Chosen yaw
 +     */
-+    public void setNewYaw(float yaw) {
++    public void setNewYaw(final float yaw) {
 +        this.yaw = yaw;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SlimePathfindEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SlimePathfindEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9e2bab27d
+index 0000000000000000000000000000000000000000..48963ce451c05f80ff13b4361e8aba196b629319
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SlimePathfindEvent.java
-@@ -0,0 +1,56 @@
+@@ -0,0 +1,54 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Slime;
@@ -63,7 +64,7 @@ index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start pathfinding.
@@ -71,6 +72,7 @@ index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimePathfindEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -78,7 +80,7 @@ index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public SlimePathfindEvent(@NotNull Slime slime) {
++    public SlimePathfindEvent(final Slime slime) {
 +        super(slime);
 +    }
 +
@@ -87,7 +89,6 @@ index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9
 +     *
 +     * @return The Slime that is pathfinding.
 +     */
-+    @NotNull
 +    public Slime getEntity() {
 +        return (Slime) super.getEntity();
 +    }
@@ -98,31 +99,29 @@ index 0000000000000000000000000000000000000000..706ed85a5415d688aaa5f138cbf583b9
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SlimeSwimEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SlimeSwimEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..65e8a29751e338b0f0acda7bef9e014852a73e6e
+index 0000000000000000000000000000000000000000..4233ea3012c03660c42e3ec93832a6e019440eba
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SlimeSwimEvent.java
-@@ -0,0 +1,19 @@
+@@ -0,0 +1,20 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start jumping while swimming in water/lava.
@@ -130,16 +129,17 @@ index 0000000000000000000000000000000000000000..65e8a29751e338b0f0acda7bef9e0148
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start jumping.
 + */
++@NullMarked
 +public class SlimeSwimEvent extends SlimeWanderEvent {
 +
 +    @ApiStatus.Internal
-+    public SlimeSwimEvent(@NotNull Slime slime) {
++    public SlimeSwimEvent(final Slime slime) {
 +        super(slime);
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SlimeTargetLivingEntityEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SlimeTargetLivingEntityEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..87c64b04dfec232e98361c3ec29da7664498c65b
+index 0000000000000000000000000000000000000000..ba7369aab0c257acafda7d3a43a41e409240bf1d
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SlimeTargetLivingEntityEvent.java
 @@ -0,0 +1,33 @@
@@ -148,7 +148,7 @@ index 0000000000000000000000000000000000000000..87c64b04dfec232e98361c3ec29da766
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to change direction to target a LivingEntity.
@@ -156,12 +156,13 @@ index 0000000000000000000000000000000000000000..87c64b04dfec232e98361c3ec29da766
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimeTargetLivingEntityEvent extends SlimePathfindEvent {
 +
-+    @NotNull private final LivingEntity target;
++    private final LivingEntity target;
 +
 +    @ApiStatus.Internal
-+    public SlimeTargetLivingEntityEvent(@NotNull Slime slime, @NotNull LivingEntity target) {
++    public SlimeTargetLivingEntityEvent(final Slime slime, final LivingEntity target) {
 +        super(slime);
 +        this.target = target;
 +    }
@@ -171,22 +172,21 @@ index 0000000000000000000000000000000000000000..87c64b04dfec232e98361c3ec29da766
 +     *
 +     * @return Targeted entity
 +     */
-+    @NotNull
 +    public LivingEntity getTarget() {
 +        return this.target;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/SlimeWanderEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/SlimeWanderEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..2ad9cc1673ffbb8b48349e461d1154d1d4ec2874
+index 0000000000000000000000000000000000000000..0ea085c4a1cf663e2333444cebda876db321164d
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/SlimeWanderEvent.java
-@@ -0,0 +1,19 @@
+@@ -0,0 +1,20 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start wandering.
@@ -194,10 +194,11 @@ index 0000000000000000000000000000000000000000..2ad9cc1673ffbb8b48349e461d1154d1
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimeWanderEvent extends SlimePathfindEvent {
 +
 +    @ApiStatus.Internal
-+    public SlimeWanderEvent(@NotNull Slime slime) {
++    public SlimeWanderEvent(final Slime slime) {
 +        super(slime);
 +    }
 +}

patches/api/0134-Add-PhantomPreSpawnEvent.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Add PhantomPreSpawnEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PhantomPreSpawnEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PhantomPreSpawnEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..ff7d9ff618ab821eeece6923a694a9a4eea8585d
+index 0000000000000000000000000000000000000000..e465222aa8218a7fef85f2e1df1a919a88499eab
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/PhantomPreSpawnEvent.java
 @@ -0,0 +1,32 @@
@@ -17,17 +17,18 @@ index 0000000000000000000000000000000000000000..ff7d9ff618ab821eeece6923a694a9a4
 +import org.bukkit.entity.EntityType;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a phantom is spawned for an exhausted player
 + */
++@NullMarked
 +public class PhantomPreSpawnEvent extends PreCreatureSpawnEvent {
 +
-+    @NotNull private final Entity entity;
++    private final Entity entity;
 +
 +    @ApiStatus.Internal
-+    public PhantomPreSpawnEvent(@NotNull Location location, @NotNull Entity entity, @NotNull CreatureSpawnEvent.SpawnReason reason) {
++    public PhantomPreSpawnEvent(final Location location, final Entity entity, final CreatureSpawnEvent.SpawnReason reason) {
 +        super(location, EntityType.PHANTOM, reason);
 +        this.entity = entity;
 +    }
@@ -37,7 +38,6 @@ index 0000000000000000000000000000000000000000..ff7d9ff618ab821eeece6923a694a9a4
 +     *
 +     * @return the Entity
 +     */
-+    @NotNull
 +    public Entity getSpawningEntity() {
 +        return this.entity;
 +    }

patches/api/0135-Add-More-Creeper-API.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add More Creeper API
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/CreeperIgniteEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/CreeperIgniteEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..e86500337f26fcb6bb04545c68c67df32021ce25
+index 0000000000000000000000000000000000000000..0c2f4f257b03d00c0ef1c50fdba6beb790fc808d
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/CreeperIgniteEvent.java
-@@ -0,0 +1,60 @@
+@@ -0,0 +1,58 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Creeper;
@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..e86500337f26fcb6bb04545c68c67df3
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Creeper is ignited either by a
 + * flint and steel, {@link Creeper#ignite()} or
 + * {@link Creeper#setIgnited(boolean)}.
 + */
++@NullMarked
 +public class CreeperIgniteEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,12 +33,11 @@ index 0000000000000000000000000000000000000000..e86500337f26fcb6bb04545c68c67df3
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public CreeperIgniteEvent(@NotNull Creeper creeper, boolean ignited) {
++    public CreeperIgniteEvent(final Creeper creeper, final boolean ignited) {
 +        super(creeper);
 +        this.ignited = ignited;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Creeper getEntity() {
 +        return (Creeper) super.getEntity();
@@ -47,7 +47,7 @@ index 0000000000000000000000000000000000000000..e86500337f26fcb6bb04545c68c67df3
 +        return this.ignited;
 +    }
 +
-+    public void setIgnited(boolean ignited) {
++    public void setIgnited(final boolean ignited) {
 +        this.ignited = ignited;
 +    }
 +
@@ -55,17 +55,15 @@ index 0000000000000000000000000000000000000000..e86500337f26fcb6bb04545c68c67df3
 +        return this.cancelled;
 +    }
 +
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0148-PreSpawnerSpawnEvent.patch

@@ -12,7 +12,7 @@ Dropped as it does not apply due to the earlier PreCreatureSpawnEvent patch not
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..2910f0bf929d918c86510f29d9361bbc19411256
+index 0000000000000000000000000000000000000000..679b37056be9515c69922285affbf0301f5335e3
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java
 @@ -0,0 +1,29 @@
@@ -22,7 +22,7 @@ index 0000000000000000000000000000000000000000..2910f0bf929d918c86510f29d9361bbc
 +import org.bukkit.entity.EntityType;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called before an entity is spawned into a world by a spawner.
@@ -30,17 +30,17 @@ index 0000000000000000000000000000000000000000..2910f0bf929d918c86510f29d9361bbc
 + * This only includes the spawner's location and not the full BlockState snapshot for performance reasons.
 + * If you really need it you have to get the spawner yourself.
 + */
++@NullMarked
 +public class PreSpawnerSpawnEvent extends PreCreatureSpawnEvent {
 +
-+    @NotNull private final Location spawnerLocation;
++    private final Location spawnerLocation;
 +
 +    @ApiStatus.Internal
-+    public PreSpawnerSpawnEvent(@NotNull Location location, @NotNull EntityType type, @NotNull Location spawnerLocation) {
++    public PreSpawnerSpawnEvent(final Location location, final EntityType type, final Location spawnerLocation) {
 +        super(location, type, CreatureSpawnEvent.SpawnReason.SPAWNER);
 +        this.spawnerLocation = spawnerLocation;
 +    }
 +
-+    @NotNull
 +    public Location getSpawnerLocation() {
 +        return this.spawnerLocation.clone();
 +    }

patches/api/0151-Turtle-API.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Turtle API
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/TurtleGoHomeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/TurtleGoHomeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..cfbc8aaf862ac90e794ee38bf8a6cb9ea414b13e
+index 0000000000000000000000000000000000000000..560b46b7b4fdd3394bc5e8fc917776a5838eba09
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/TurtleGoHomeEvent.java
-@@ -0,0 +1,53 @@
+@@ -0,0 +1,51 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.Turtle;
@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..cfbc8aaf862ac90e794ee38bf8a6cb9e
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle decides to go home
 + */
++@NullMarked
 +public class TurtleGoHomeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..cfbc8aaf862ac90e794ee38bf8a6cb9e
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleGoHomeEvent(@NotNull Turtle turtle) {
++    public TurtleGoHomeEvent(final Turtle turtle) {
 +        super(turtle);
 +    }
 +
@@ -38,7 +39,6 @@ index 0000000000000000000000000000000000000000..cfbc8aaf862ac90e794ee38bf8a6cb9e
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -49,26 +49,24 @@ index 0000000000000000000000000000000000000000..cfbc8aaf862ac90e794ee38bf8a6cb9e
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/TurtleLayEggEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/TurtleLayEggEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0bb7b01e4
+index 0000000000000000000000000000000000000000..d1b2bbb57280726690e704c5978d312d856243eb
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/TurtleLayEggEvent.java
-@@ -0,0 +1,92 @@
+@@ -0,0 +1,88 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.Location;
@@ -77,23 +75,23 @@ index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle lays eggs
 + */
++@NullMarked
 +public class TurtleLayEggEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull
 +    private final Location location;
 +    private int eggCount;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleLayEggEvent(@NotNull Turtle turtle, @NotNull Location location, int eggCount) {
++    public TurtleLayEggEvent(final Turtle turtle, final Location location, final int eggCount) {
 +        super(turtle);
 +        this.location = location;
 +        this.eggCount = eggCount;
@@ -104,7 +102,6 @@ index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -114,7 +111,6 @@ index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0
 +     *
 +     * @return Location of eggs
 +     */
-+    @NotNull
 +    public Location getLocation() {
 +        return this.location.clone();
 +    }
@@ -133,7 +129,7 @@ index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0
 +     *
 +     * @param eggCount Number of eggs
 +     */
-+    public void setEggCount(int eggCount) {
++    public void setEggCount(final int eggCount) {
 +        if (eggCount < 1) {
 +            this.cancelled = true;
 +            return;
@@ -147,26 +143,24 @@ index 0000000000000000000000000000000000000000..3029e406cd684efb5645e38711dff9c0
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/TurtleStartDiggingEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/TurtleStartDiggingEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7a2fa4a11b47e4982d1644830d7e28f12b4378ec
+index 0000000000000000000000000000000000000000..4a53af5da307cd71e0e647917bec9be44136e6aa
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/TurtleStartDiggingEvent.java
-@@ -0,0 +1,66 @@
+@@ -0,0 +1,63 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.Location;
@@ -175,20 +169,21 @@ index 0000000000000000000000000000000000000000..7a2fa4a11b47e4982d1644830d7e28f1
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle starts digging to lay eggs
 + */
++@NullMarked
 +public class TurtleStartDiggingEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Location location;
++    private final Location location;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleStartDiggingEvent(@NotNull Turtle turtle, @NotNull Location location) {
++    public TurtleStartDiggingEvent(final Turtle turtle, final Location location) {
 +        super(turtle);
 +        this.location = location;
 +    }
@@ -198,7 +193,6 @@ index 0000000000000000000000000000000000000000..7a2fa4a11b47e4982d1644830d7e28f1
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -208,7 +202,6 @@ index 0000000000000000000000000000000000000000..7a2fa4a11b47e4982d1644830d7e28f1
 +     *
 +     * @return Location where digging
 +     */
-+    @NotNull
 +    public Location getLocation() {
 +        return this.location.clone();
 +    }
@@ -219,16 +212,14 @@ index 0000000000000000000000000000000000000000..7a2fa4a11b47e4982d1644830d7e28f1
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0158-Add-PlayerConnectionCloseEvent.patch

@@ -35,21 +35,20 @@ is undefined.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerConnectionCloseEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerConnectionCloseEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..d0fb13adc140f1ca74d0c3448f92baa60684f3e2
+index 0000000000000000000000000000000000000000..5f5afcdb3c9e669ed0e730c720ad91d16b95602c
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerConnectionCloseEvent.java
-@@ -0,0 +1,88 @@
+@@ -0,0 +1,83 @@
 +package com.destroystokyo.paper.event.player;
 +
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+
 +import java.net.InetAddress;
 +import java.util.UUID;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.AsyncPlayerPreLoginEvent;
 +import org.bukkit.event.player.PlayerQuitEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * <p>
@@ -76,16 +75,17 @@ index 0000000000000000000000000000000000000000..d0fb13adc140f1ca74d0c3448f92baa6
 + * The event may be invoked asynchronously or synchronously. Plugins should check
 + * {@link Event#isAsynchronous()} and handle accordingly.
 + */
++@NullMarked
 +public class PlayerConnectionCloseEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final UUID playerUniqueId;
++    private final UUID playerUniqueId;
-+    @NotNull private final String playerName;
++    private final String playerName;
-+    @NotNull private final InetAddress ipAddress;
++    private final InetAddress ipAddress;
 +
 +    @ApiStatus.Internal
-+    public PlayerConnectionCloseEvent(@NotNull final UUID playerUniqueId, @NotNull final String playerName, @NotNull final InetAddress ipAddress, final boolean async) {
++    public PlayerConnectionCloseEvent(final UUID playerUniqueId, final String playerName, final InetAddress ipAddress, final boolean async) {
 +        super(async);
 +        this.playerUniqueId = playerUniqueId;
 +        this.playerName = playerName;
@@ -95,7 +95,6 @@ index 0000000000000000000000000000000000000000..d0fb13adc140f1ca74d0c3448f92baa6
 +    /**
 +     * Returns the {@code UUID} of the player disconnecting.
 +     */
-+    @NotNull
 +    public UUID getPlayerUniqueId() {
 +        return this.playerUniqueId;
 +    }
@@ -103,7 +102,6 @@ index 0000000000000000000000000000000000000000..d0fb13adc140f1ca74d0c3448f92baa6
 +    /**
 +     * Returns the name of the player disconnecting.
 +     */
-+    @NotNull
 +    public String getPlayerName() {
 +        return this.playerName;
 +    }
@@ -111,18 +109,15 @@ index 0000000000000000000000000000000000000000..d0fb13adc140f1ca74d0c3448f92baa6
 +    /**
 +     * Returns the player's IP address.
 +     */
-+    @NotNull
 +    public InetAddress getIpAddress() {
 +        return this.ipAddress;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0161-BlockDestroyEvent.patch

@@ -12,10 +12,10 @@ This can replace many uses of BlockPhysicsEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/block/BlockDestroyEvent.java b/src/main/java/com/destroystokyo/paper/event/block/BlockDestroyEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889ece1a9168
+index 0000000000000000000000000000000000000000..122ccdef02c292c5705a6ac0a96e6095d28bd7bf
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/block/BlockDestroyEvent.java
-@@ -0,0 +1,122 @@
+@@ -0,0 +1,120 @@
 +package com.destroystokyo.paper.event.block;
 +
 +import org.bukkit.block.Block;
@@ -24,7 +24,7 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockExpEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired anytime the server intends to 'destroy' a block through some triggering reason.
@@ -36,11 +36,12 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 + * <p>
 + * Events such as leaves decaying, pistons retracting (where the block is moving), does NOT fire this event.
 + */
++@NullMarked
 +public class BlockDestroyEvent extends BlockExpEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final BlockData newState;
++    private final BlockData newState;
 +    private boolean willDrop;
 +    private boolean playEffect = true;
 +    private BlockData effectBlock;
@@ -48,7 +49,7 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BlockDestroyEvent(@NotNull Block block, @NotNull BlockData newState, @NotNull BlockData effectBlock, int xp, boolean willDrop) {
++    public BlockDestroyEvent(final Block block, final BlockData newState, final BlockData effectBlock, final int xp, final boolean willDrop) {
 +        super(block, xp);
 +        this.newState = newState;
 +        this.effectBlock = effectBlock;
@@ -60,7 +61,6 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +     *
 +     * @return block break effect
 +     */
-+    @NotNull
 +    public BlockData getEffectBlock() {
 +        return this.effectBlock;
 +    }
@@ -72,14 +72,14 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +     *
 +     * @param effectBlock block effect
 +     */
-+    public void setEffectBlock(@NotNull BlockData effectBlock) {
++    public void setEffectBlock(final BlockData effectBlock) {
 +        this.effectBlock = effectBlock;
 +    }
 +
 +    /**
 +     * @return The new state of this block (Air, or a Fluid type)
 +     */
-+    public @NotNull BlockData getNewState() {
++    public BlockData getNewState() {
 +        return this.newState.clone();
 +    }
 +
@@ -93,7 +93,7 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +    /**
 +     * @param willDrop If the server is going to drop the block in question with this destroy event
 +     */
-+    public void setWillDrop(boolean willDrop) {
++    public void setWillDrop(final boolean willDrop) {
 +        this.willDrop = willDrop;
 +    }
 +
@@ -107,7 +107,7 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +    /**
 +     * @param playEffect If the server should play the sound effect for this destruction
 +     */
-+    public void setPlayEffect(boolean playEffect) {
++    public void setPlayEffect(final boolean playEffect) {
 +        this.playEffect = playEffect;
 +    }
 +
@@ -123,17 +123,15 @@ index 0000000000000000000000000000000000000000..c0742b58ca2c098c27394915b624889e
 +     * If the event is cancelled, the block will remain in its previous state.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0162-Add-WhitelistToggleEvent.patch

@@ -6,22 +6,23 @@ Subject: [PATCH] Add WhitelistToggleEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/server/WhitelistToggleEvent.java b/src/main/java/com/destroystokyo/paper/event/server/WhitelistToggleEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..22fa169c278639f31aec2695259963038de0af8a
+index 0000000000000000000000000000000000000000..b9a59a28c1dec6c174885892ff40d3caaaf409a4
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/server/WhitelistToggleEvent.java
-@@ -0,0 +1,43 @@
+@@ -0,0 +1,42 @@
 +package com.destroystokyo.paper.event.server;
 +
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event is fired when whitelist is toggled
 + *
 + * @author Mark Vainomaa
 + */
++@NullMarked
 +public class WhitelistToggleEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..22fa169c278639f31aec269525996303
 +    private final boolean enabled;
 +
 +    @ApiStatus.Internal
-+    public WhitelistToggleEvent(boolean enabled) {
++    public WhitelistToggleEvent(final boolean enabled) {
 +        this.enabled = enabled;
 +    }
 +
@@ -42,13 +43,11 @@ index 0000000000000000000000000000000000000000..22fa169c278639f31aec269525996303
 +        return this.enabled;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0163-Add-GS4-Query-event.patch

@@ -6,25 +6,25 @@ Subject: [PATCH] Add GS4 Query event
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/server/GS4QueryEvent.java b/src/main/java/com/destroystokyo/paper/event/server/GS4QueryEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097291978a6
+index 0000000000000000000000000000000000000000..5a8813c80e56d17ccaa35a7eef2f6bd70c7a3d96
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/server/GS4QueryEvent.java
-@@ -0,0 +1,424 @@
+@@ -0,0 +1,395 @@
 +package com.destroystokyo.paper.event.server;
 +
 +import com.google.common.base.Preconditions;
 +import com.google.common.collect.ImmutableList;
-+import org.bukkit.Server;
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
-+
 +import java.net.InetAddress;
 +import java.util.ArrayList;
 +import java.util.Arrays;
 +import java.util.Collection;
 +import java.util.List;
++import org.bukkit.Server;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
++import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
++import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event is fired if server is getting queried over GS4 Query protocol.
@@ -33,6 +33,7 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 + *
 + * @author Mark Vainomaa
 + */
++@NullMarked
 +public final class GS4QueryEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -42,7 +43,7 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +    private QueryResponse response;
 +
 +    @ApiStatus.Internal
-+    public GS4QueryEvent(@NotNull QueryType queryType, @NotNull InetAddress querierAddress, @NotNull QueryResponse response) {
++    public GS4QueryEvent(final QueryType queryType, final InetAddress querierAddress, final QueryResponse response) {
 +        super(true); // should always be called async
 +        this.queryType = queryType;
 +        this.querierAddress = querierAddress;
@@ -54,7 +55,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +     *
 +     * @return query type
 +     */
-+    @NotNull
 +    public QueryType getQueryType() {
 +        return this.queryType;
 +    }
@@ -64,7 +64,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +     *
 +     * @return querier address
 +     */
-+    @NotNull
 +    public InetAddress getQuerierAddress() {
 +        return this.querierAddress;
 +    }
@@ -74,7 +73,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +     *
 +     * @return query response
 +     */
-+    @NotNull
 +    public QueryResponse getResponse() {
 +        return this.response;
 +    }
@@ -84,17 +82,15 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +     *
 +     * @param response query response
 +     */
-+    public void setResponse(@NotNull QueryResponse response) {
++    public void setResponse(final QueryResponse response) {
 +        this.response = Preconditions.checkNotNull(response, "response");
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -115,7 +111,7 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +        FULL
 +    }
 +
-+    public final static class QueryResponse {
++    public static final class QueryResponse {
 +
 +        private final String motd;
 +        private final String gameVersion;
@@ -128,7 +124,7 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +        private final String serverVersion;
 +        private final Collection<PluginInformation> plugins;
 +
-+        private QueryResponse(String motd, String gameVersion, String map, int currentPlayers, int maxPlayers, String hostname, int port, Collection<String> players, String serverVersion, Collection<PluginInformation> plugins) {
++        private QueryResponse(final String motd, final String gameVersion, final String map, final int currentPlayers, final int maxPlayers, final String hostname, final int port, final Collection<String> players, final String serverVersion, final Collection<PluginInformation> plugins) {
 +            this.motd = motd;
 +            this.gameVersion = gameVersion;
 +            this.map = map;
@@ -142,21 +138,19 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +        }
 +
 +        /**
-+         * Get motd which will be used to reply to the query. By default it is {@link Server#getMotd()}.
++         * Get motd which will be used to reply to the query. By default, it is {@link Server#getMotd()}.
 +         *
 +         * @return motd
 +         */
-+        @NotNull
 +        public String getMotd() {
 +            return this.motd;
 +        }
 +
 +        /**
-+         * Get game version which will be used to reply to the query. By default supported Minecraft versions range is sent.
++         * Get game version which will be used to reply to the query. By default, supported Minecraft versions range is sent.
 +         *
 +         * @return game version
 +         */
-+        @NotNull
 +        public String getGameVersion() {
 +            return this.gameVersion;
 +        }
@@ -166,7 +160,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return map name
 +         */
-+        @NotNull
 +        public String getMap() {
 +            return this.map;
 +        }
@@ -194,7 +187,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return server hostname
 +         */
-+        @NotNull
 +        public String getHostname() {
 +            return this.hostname;
 +        }
@@ -213,7 +205,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return collection of players
 +         */
-+        @NotNull
 +        public Collection<String> getPlayers() {
 +            return this.players;
 +        }
@@ -223,7 +214,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return server software
 +         */
-+        @NotNull
 +        public String getServerVersion() {
 +            return this.serverVersion;
 +        }
@@ -233,7 +223,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return collection of plugins
 +         */
-+        @NotNull
 +        public Collection<PluginInformation> getPlugins() {
 +            return this.plugins;
 +        }
@@ -243,19 +232,18 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return {@link QueryResponse} builder
 +         */
-+        @NotNull
 +        public Builder toBuilder() {
 +            return QueryResponse.builder()
-+                .motd(getMotd())
++                .motd(this.getMotd())
-+                .gameVersion(getGameVersion())
++                .gameVersion(this.getGameVersion())
-+                .map(getMap())
++                .map(this.getMap())
-+                .currentPlayers(getCurrentPlayers())
++                .currentPlayers(this.getCurrentPlayers())
-+                .maxPlayers(getMaxPlayers())
++                .maxPlayers(this.getMaxPlayers())
-+                .hostname(getHostname())
++                .hostname(this.getHostname())
-+                .port(getPort())
++                .port(this.getPort())
-+                .players(getPlayers())
++                .players(this.getPlayers())
-+                .serverVersion(getServerVersion())
++                .serverVersion(this.getServerVersion())
-+                .plugins(getPlugins());
++                .plugins(this.getPlugins());
 +        }
 +
 +        /**
@@ -263,7 +251,6 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         *
 +         * @return {@link QueryResponse} builder
 +         */
-+        @NotNull
 +        public static Builder builder() {
 +            return new Builder();
 +        }
@@ -272,11 +259,12 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +         * A builder for {@link QueryResponse} objects.
 +         */
 +        public static final class Builder {
-+            private String motd;
++
-+            private String gameVersion;
++            private @MonotonicNonNull String motd;
-+            private String map;
++            private @MonotonicNonNull String gameVersion;
-+            private String hostname;
++            private @MonotonicNonNull String map;
-+            private String serverVersion;
++            private @MonotonicNonNull String hostname;
++            private @MonotonicNonNull String serverVersion;
 +
 +            private int currentPlayers;
 +            private int maxPlayers;
@@ -285,90 +273,77 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +            private final List<String> players = new ArrayList<>();
 +            private final List<PluginInformation> plugins = new ArrayList<>();
 +
-+            private Builder() {}
++            private Builder() {
++            }
 +
-+            @NotNull
++            public Builder motd(final String motd) {
-+            public Builder motd(@NotNull String motd) {
 +                this.motd = Preconditions.checkNotNull(motd, "motd");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder gameVersion(final String gameVersion) {
-+            public Builder gameVersion(@NotNull String gameVersion) {
 +                this.gameVersion = Preconditions.checkNotNull(gameVersion, "gameVersion");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder map(final String map) {
-+            public Builder map(@NotNull String map) {
 +                this.map = Preconditions.checkNotNull(map, "map");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder currentPlayers(final int currentPlayers) {
-+            public Builder currentPlayers(int currentPlayers) {
 +                Preconditions.checkArgument(currentPlayers >= 0, "currentPlayers cannot be negative");
 +                this.currentPlayers = currentPlayers;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder maxPlayers(final int maxPlayers) {
-+            public Builder maxPlayers(int maxPlayers) {
 +                Preconditions.checkArgument(maxPlayers >= 0, "maxPlayers cannot be negative");
 +                this.maxPlayers = maxPlayers;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder hostname(final String hostname) {
-+            public Builder hostname(@NotNull String hostname) {
 +                this.hostname = Preconditions.checkNotNull(hostname, "hostname");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder port(final int port) {
-+            public Builder port(int port) {
 +                Preconditions.checkArgument(port >= 1 && port <= 65535, "port must be between 1-65535");
 +                this.port = port;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder players(final Collection<String> players) {
-+            public Builder players(@NotNull Collection<String> players) {
 +                this.players.addAll(Preconditions.checkNotNull(players, "players"));
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder players(final String... players) {
-+            public Builder players(@NotNull String... players) {
 +                this.players.addAll(Arrays.asList(Preconditions.checkNotNull(players, "players")));
 +                return this;
 +            }
 +
-+            @NotNull
 +            public Builder clearPlayers() {
 +                this.players.clear();
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder serverVersion(final String serverVersion) {
-+            public Builder serverVersion(@NotNull String serverVersion) {
 +                this.serverVersion = Preconditions.checkNotNull(serverVersion, "serverVersion");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder plugins(final Collection<PluginInformation> plugins) {
-+            public Builder plugins(@NotNull Collection<PluginInformation> plugins) {
 +                this.plugins.addAll(Preconditions.checkNotNull(plugins, "plugins"));
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder plugins(final PluginInformation... plugins) {
-+            public Builder plugins(@NotNull PluginInformation... plugins) {
 +                this.plugins.addAll(Arrays.asList(Preconditions.checkNotNull(plugins, "plugins")));
 +                return this;
 +            }
 +
-+            @NotNull
 +            public Builder clearPlugins() {
 +                this.plugins.clear();
 +                return this;
@@ -379,19 +354,18 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +             *
 +             * @return response
 +             */
-+            @NotNull
 +            public QueryResponse build() {
 +                return new QueryResponse(
-+                    Preconditions.checkNotNull(motd, "motd"),
++                    Preconditions.checkNotNull(this.motd, "motd"),
-+                    Preconditions.checkNotNull(gameVersion, "gameVersion"),
++                    Preconditions.checkNotNull(this.gameVersion, "gameVersion"),
-+                    Preconditions.checkNotNull(map, "map"),
++                    Preconditions.checkNotNull(this.map, "map"),
-+                    currentPlayers,
++                    this.currentPlayers,
-+                    maxPlayers,
++                    this.maxPlayers,
-+                    Preconditions.checkNotNull(hostname, "hostname"),
++                    Preconditions.checkNotNull(this.hostname, "hostname"),
-+                    port,
++                    this.port,
-+                    ImmutableList.copyOf(players),
++                    ImmutableList.copyOf(this.players),
-+                    Preconditions.checkNotNull(serverVersion, "serverVersion"),
++                    Preconditions.checkNotNull(this.serverVersion, "serverVersion"),
-+                    ImmutableList.copyOf(plugins)
++                    ImmutableList.copyOf(this.plugins)
 +                );
 +            }
 +        }
@@ -404,31 +378,28 @@ index 0000000000000000000000000000000000000000..8edc33bde29e967cec488d0f5e2f1097
 +            private String name;
 +            private String version;
 +
-+            public PluginInformation(@NotNull String name, @NotNull String version) {
++            public PluginInformation(final String name, final String version) {
 +                this.name = Preconditions.checkNotNull(name, "name");
 +                this.version = Preconditions.checkNotNull(version, "version");
 +            }
 +
-+            @NotNull
 +            public String getName() {
 +                return this.name;
 +            }
 +
-+            public void setName(@NotNull String name) {
++            public void setName(final String name) {
 +                this.name = name;
 +            }
 +
-+            public void setVersion(@NotNull String version) {
++            public void setVersion(final String version) {
 +                this.version = version;
 +            }
 +
-+            @NotNull
 +            public String getVersion() {
 +                return this.version;
 +            }
 +
-+            @NotNull
++            public static PluginInformation of(final String name, final String version) {
-+            public static PluginInformation of(@NotNull String name, @NotNull String version) {
 +                return new PluginInformation(name, version);
 +            }
 +        }

patches/api/0167-Server-Tick-Events.patch

@@ -7,20 +7,21 @@ Fires event at start and end of a server tick
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/server/ServerTickEndEvent.java b/src/main/java/com/destroystokyo/paper/event/server/ServerTickEndEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..17e9f39ce1cc7489e936c96f95b8b0579528b222
+index 0000000000000000000000000000000000000000..15a177ce555ed329988d97a9f0b5d9c71aea18fb
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/server/ServerTickEndEvent.java
-@@ -0,0 +1,62 @@
+@@ -0,0 +1,61 @@
 +package com.destroystokyo.paper.event.server;
 +
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when the server has finished ticking the main loop
 + */
++@NullMarked
 +public class ServerTickEndEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..17e9f39ce1cc7489e936c96f95b8b057
 +    private final long timeEnd;
 +
 +    @ApiStatus.Internal
-+    public ServerTickEndEvent(int tickNumber, double tickDuration, long timeRemaining) {
++    public ServerTickEndEvent(final int tickNumber, final double tickDuration, final long timeRemaining) {
 +        this.tickNumber = tickNumber;
 +        this.tickDuration = tickDuration;
 +        this.timeEnd = System.nanoTime() + timeRemaining;
@@ -63,29 +64,28 @@ index 0000000000000000000000000000000000000000..17e9f39ce1cc7489e936c96f95b8b057
 +        return this.timeEnd - System.nanoTime();
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/server/ServerTickStartEvent.java b/src/main/java/com/destroystokyo/paper/event/server/ServerTickStartEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..fb5bbfffea8b883e4c8769484a2b64dd895cb617
+index 0000000000000000000000000000000000000000..7c15e6487e17b3255e2428d73aef344ee32a43fd
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/server/ServerTickStartEvent.java
-@@ -0,0 +1,35 @@
+@@ -0,0 +1,34 @@
 +package com.destroystokyo.paper.event.server;
 +
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class ServerTickStartEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -93,7 +93,7 @@ index 0000000000000000000000000000000000000000..fb5bbfffea8b883e4c8769484a2b64dd
 +    private final int tickNumber;
 +
 +    @ApiStatus.Internal
-+    public ServerTickStartEvent(int tickNumber) {
++    public ServerTickStartEvent(final int tickNumber) {
 +        this.tickNumber = tickNumber;
 +    }
 +
@@ -104,12 +104,10 @@ index 0000000000000000000000000000000000000000..fb5bbfffea8b883e4c8769484a2b64dd
 +        return this.tickNumber;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0177-Add-ThrownEggHatchEvent.patch

@@ -8,10 +8,10 @@ Adds a new event similar to PlayerEggThrowEvent, but without the Player requirem
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/ThrownEggHatchEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/ThrownEggHatchEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b3510879169a0a125
+index 0000000000000000000000000000000000000000..26526049a4c7f7ebe6bea27a9c5a638df3ef8854
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/ThrownEggHatchEvent.java
-@@ -0,0 +1,120 @@
+@@ -0,0 +1,117 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import com.google.common.base.Preconditions;
@@ -20,13 +20,14 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a thrown egg might hatch.
 + * <p>
 + * This event fires for all thrown eggs that may hatch, players, dispensers, etc.
 + */
++@NullMarked
 +public class ThrownEggHatchEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,7 +38,7 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +    private EntityType hatchType;
 +
 +    @ApiStatus.Internal
-+    public ThrownEggHatchEvent(@NotNull final Egg egg, final boolean hatching, final byte numHatches, @NotNull final EntityType hatchingType) {
++    public ThrownEggHatchEvent(final Egg egg, final boolean hatching, final byte numHatches, final EntityType hatchingType) {
 +        this.egg = egg;
 +        this.hatching = hatching;
 +        this.numHatches = numHatches;
@@ -49,7 +50,6 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +     *
 +     * @return the egg involved in this event
 +     */
-+    @NotNull
 +    public Egg getEgg() {
 +        return this.egg;
 +    }
@@ -68,9 +68,9 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +     * Sets whether the egg will hatch or not.
 +     *
 +     * @param hatching {@code true} if you want the egg to hatch, {@code false} if you want it
-+     *     not to
++     *                 not to
 +     */
-+    public void setHatching(boolean hatching) {
++    public void setHatching(final boolean hatching) {
 +        this.hatching = hatching;
 +    }
 +
@@ -79,7 +79,6 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +     *
 +     * @return The type of the mob being hatched by the egg
 +     */
-+    @NotNull
 +    public EntityType getHatchingType() {
 +        return this.hatchType;
 +    }
@@ -89,13 +88,13 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +     *
 +     * @param hatchType The type of the mob being hatched by the egg
 +     */
-+    public void setHatchingType(@NotNull EntityType hatchType) {
++    public void setHatchingType(final EntityType hatchType) {
 +        Preconditions.checkArgument(hatchType.isSpawnable(), "Can't spawn that entity type from an egg!");
 +        this.hatchType = hatchType;
 +    }
 +
 +    /**
-+     * Get the number of mob hatches from the egg. By default the number will
++     * Get the number of mob hatches from the egg. By default, the number will
 +     * be the number the server would've done
 +     * <ul>
 +     *  <li>7/8 chance of being 0
@@ -117,17 +116,15 @@ index 0000000000000000000000000000000000000000..092bab9be36acc0f04c7ea5b35108791
 +     *
 +     * @param numHatches The number of mobs coming out of the egg
 +     */
-+    public void setNumHatches(byte numHatches) {
++    public void setNumHatches(final byte numHatches) {
 +        this.numHatches = numHatches;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0178-Entity-Jump-API.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Entity Jump API
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityJumpEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityJumpEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..a6306c957fcacdcbcc8037b4ee33a167d21ff29e
+index 0000000000000000000000000000000000000000..1f1c159db2095733a585e102f34c2b657ca82dc2
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityJumpEvent.java
-@@ -0,0 +1,50 @@
+@@ -0,0 +1,48 @@
 +package com.destroystokyo.paper.event.entity;
 +
 +import org.bukkit.entity.LivingEntity;
@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..a6306c957fcacdcbcc8037b4ee33a167
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity jumps
 + * <p>
 + * Cancelling the event will stop the entity from jumping
 + */
++@NullMarked
 +public class EntityJumpEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,11 +32,10 @@ index 0000000000000000000000000000000000000000..a6306c957fcacdcbcc8037b4ee33a167
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityJumpEvent(@NotNull LivingEntity entity) {
++    public EntityJumpEvent(final LivingEntity entity) {
 +        super(entity);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -45,17 +45,15 @@ index 0000000000000000000000000000000000000000..a6306c957fcacdcbcc8037b4ee33a167
 +        return this.cancelled;
 +    }
 +
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0196-Add-PrepareResultEvent-PrepareGrindstoneEvent.patch

@@ -48,7 +48,7 @@ index 0000000000000000000000000000000000000000..f75933948cdf0aa0c9bb2f06da5418f1
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..c305c606bef93866993095cec5f50e191c5a382a
+index 0000000000000000000000000000000000000000..5ae8b843f78b22e300de0202fb800fcae6ff49b0
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/inventory/PrepareResultEvent.java
 @@ -0,0 +1,40 @@
@@ -58,18 +58,19 @@ index 0000000000000000000000000000000000000000..c305c606bef93866993095cec5f50e19
 +import org.bukkit.inventory.InventoryView;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an item is put in an inventory containing a result slot
 + */
++@NullMarked
 +public class PrepareResultEvent extends PrepareInventoryResultEvent {
 +
 +    // HandlerList on PrepareInventoryResultEvent to ensure api compat
 +
 +    @ApiStatus.Internal
-+    public PrepareResultEvent(@NotNull InventoryView inventory, @Nullable ItemStack result) {
++    public PrepareResultEvent(final InventoryView inventory, final @Nullable ItemStack result) {
 +        super(inventory, result);
 +    }
 +
@@ -78,8 +79,7 @@ index 0000000000000000000000000000000000000000..c305c606bef93866993095cec5f50e19
 +     *
 +     * @return result item
 +     */
-+    @Nullable
++    public @Nullable ItemStack getResult() {
-+    public ItemStack getResult() {
 +        return super.getResult();
 +    }
 +
@@ -88,7 +88,7 @@ index 0000000000000000000000000000000000000000..c305c606bef93866993095cec5f50e19
 +     *
 +     * @param result result item
 +     */
-+    public void setResult(@Nullable ItemStack result) {
++    public void setResult(final @Nullable ItemStack result) {
 +        super.setResult(result);
 +    }
 +}

patches/api/0218-Add-PlayerShearBlockEvent.patch

@@ -6,12 +6,13 @@ Subject: [PATCH] Add PlayerShearBlockEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/PlayerShearBlockEvent.java b/src/main/java/io/papermc/paper/event/block/PlayerShearBlockEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a7e955a4f
+index 0000000000000000000000000000000000000000..33c6e1868e1bad4802bcadecebc2b46633690fce
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/PlayerShearBlockEvent.java
-@@ -0,0 +1,113 @@
+@@ -0,0 +1,107 @@
 +package io.papermc.paper.event.block;
 +
++import java.util.List;
 +import org.bukkit.block.Block;
 +import org.bukkit.entity.Player;
 +import org.bukkit.event.Cancellable;
@@ -20,9 +21,7 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +import org.bukkit.inventory.EquipmentSlot;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Called when a player uses sheers on a block.
@@ -32,6 +31,7 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 + * <p>
 + * Examples include shearing a pumpkin to turn it into a carved pumpkin or shearing a beehive to get honeycomb.
 + */
++@NullMarked
 +public class PlayerShearBlockEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -44,7 +44,7 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PlayerShearBlockEvent(@NotNull Player player, @NotNull Block block, @NotNull ItemStack item, @NotNull EquipmentSlot hand, @NotNull List<ItemStack> drops) {
++    public PlayerShearBlockEvent(final Player player, final Block block, final ItemStack item, final EquipmentSlot hand, final List<ItemStack> drops) {
 +        super(player);
 +        this.block = block;
 +        this.item = item;
@@ -57,7 +57,6 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +     *
 +     * @return The {@link Block} which block is being sheared in this event.
 +     */
-+    @NotNull
 +    public Block getBlock() {
 +        return this.block;
 +    }
@@ -67,7 +66,6 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +     *
 +     * @return The {@link ItemStack} of the shears.
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -77,7 +75,6 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +     *
 +     * @return Either {@link EquipmentSlot#HAND} OR {@link EquipmentSlot#OFF_HAND}.
 +     */
-+    @NotNull
 +    public EquipmentSlot getHand() {
 +        return this.hand;
 +    }
@@ -85,9 +82,8 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +    /**
 +     * Gets the resulting drops of this event.
 +     *
-+     * @return A {@link List list} of {@link ItemStack items} that will be dropped as result of this event.
++     * @return A mutable {@link List list} of {@link ItemStack items} that will be dropped as result of this event.
 +     */
-+    @NotNull
 +    public List<ItemStack> getDrops() {
 +        return this.drops;
 +    }
@@ -108,17 +104,15 @@ index 0000000000000000000000000000000000000000..9bb4a79320eac7d662d9d04765664b6a
 +     * @param cancel whether the shearing of the block should be cancelled or not.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0223-Add-TargetHitEvent-API.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add TargetHitEvent API
 
 diff --git a/src/main/java/io/papermc/paper/event/block/TargetHitEvent.java b/src/main/java/io/papermc/paper/event/block/TargetHitEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..5247e7f78e0076089c1e1bdea2afbb455c43732a
+index 0000000000000000000000000000000000000000..6555bf7f4485eacd8d35113d5b21b73f0693a950
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/TargetHitEvent.java
-@@ -0,0 +1,61 @@
+@@ -0,0 +1,60 @@
 +package io.papermc.paper.event.block;
 +
 +import com.google.common.base.Preconditions;
@@ -19,8 +19,8 @@ index 0000000000000000000000000000000000000000..5247e7f78e0076089c1e1bdea2afbb45
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.ProjectileHitEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Target Block is hit by a projectile.
@@ -29,6 +29,7 @@ index 0000000000000000000000000000000000000000..5247e7f78e0076089c1e1bdea2afbb45
 + * and in the case that the shooter is a player, will stop them from receiving
 + * advancement criteria.
 + */
++@NullMarked
 +public class TargetHitEvent extends ProjectileHitEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -36,7 +37,7 @@ index 0000000000000000000000000000000000000000..5247e7f78e0076089c1e1bdea2afbb45
 +    private int signalStrength;
 +
 +    @ApiStatus.Internal
-+    public TargetHitEvent(@NotNull Projectile projectile, @NotNull Block block, @NotNull BlockFace blockFace, int signalStrength) {
++    public TargetHitEvent(final Projectile projectile, final Block block, final BlockFace blockFace, final int signalStrength) {
 +        super(projectile, null, block, blockFace);
 +        this.signalStrength = signalStrength;
 +    }
@@ -55,18 +56,16 @@ index 0000000000000000000000000000000000000000..5247e7f78e0076089c1e1bdea2afbb45
 +     *
 +     * @param signalStrength the strength of the redstone signal to be emitted
 +     */
-+    public void setSignalStrength(@Range(from = 0, to = 15) int signalStrength) {
++    public void setSignalStrength(final @Range(from = 0, to = 15) int signalStrength) {
 +        Preconditions.checkArgument(signalStrength >= 0 && signalStrength <= 15, "Signal strength out of range (%s), must be in range [0,15]", signalStrength);
 +        this.signalStrength = signalStrength;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0228-Add-EntityLoadCrossbowEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add EntityLoadCrossbowEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityLoadCrossbowEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityLoadCrossbowEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb65c478a9
+index 0000000000000000000000000000000000000000..f7631a5ac0f2ccfa6b81bea9ab54b30fbb3278dd
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityLoadCrossbowEvent.java
-@@ -0,0 +1,96 @@
+@@ -0,0 +1,92 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.LivingEntity;
@@ -19,11 +19,12 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +import org.bukkit.inventory.EquipmentSlot;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a LivingEntity loads a crossbow with a projectile.
 + */
++@NullMarked
 +public class EntityLoadCrossbowEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,13 +36,12 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityLoadCrossbowEvent(@NotNull LivingEntity entity, @NotNull ItemStack crossbow, @NotNull EquipmentSlot hand) {
++    public EntityLoadCrossbowEvent(final LivingEntity entity, final ItemStack crossbow, final EquipmentSlot hand) {
 +        super(entity);
 +        this.crossbow = crossbow;
 +        this.hand = hand;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -52,7 +52,6 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +     *
 +     * @return the crossbow involved in this event
 +     */
-+    @NotNull
 +    public ItemStack getCrossbow() {
 +        return this.crossbow;
 +    }
@@ -62,7 +61,6 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +     *
 +     * @return the hand
 +     */
-+    @NotNull
 +    public EquipmentSlot getHand() {
 +        return this.hand;
 +    }
@@ -77,7 +75,7 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +    /**
 +     * @param consume should the item be consumed
 +     */
-+    public void setConsumeItem(boolean consume) {
++    public void setConsumeItem(final boolean consume) {
 +        this.consumeItem = consume;
 +    }
 +
@@ -91,17 +89,15 @@ index 0000000000000000000000000000000000000000..8434ea803e3135380f9351c82a414ccb
 +     * projectile that would be loaded into the crossbow will not be consumed.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0230-Added-ServerResourcesReloadedEvent.patch

@@ -6,22 +6,23 @@ Subject: [PATCH] Added ServerResourcesReloadedEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/server/ServerResourcesReloadedEvent.java b/src/main/java/io/papermc/paper/event/server/ServerResourcesReloadedEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..a7ed7d6b6469e175d3949ffa9c502cbfde609215
+index 0000000000000000000000000000000000000000..468bbfcaa3fed60dc73726f4e5ace93009f92507
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/server/ServerResourcesReloadedEvent.java
-@@ -0,0 +1,49 @@
+@@ -0,0 +1,47 @@
 +package io.papermc.paper.event.server;
 +
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.server.ServerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when resources such as datapacks are reloaded (e.g. /minecraft:reload)
 + * <p>
 + * Intended for use to re-register custom recipes, advancements that may be lost during a reload like this.
 + */
++@NullMarked
 +public class ServerResourcesReloadedEvent extends ServerEvent {
 +
 +    public static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..a7ed7d6b6469e175d3949ffa9c502cbf
 +    private final Cause cause;
 +
 +    @ApiStatus.Internal
-+    public ServerResourcesReloadedEvent(@NotNull Cause cause) {
++    public ServerResourcesReloadedEvent(final Cause cause) {
 +        this.cause = cause;
 +    }
 +
@@ -38,17 +39,14 @@ index 0000000000000000000000000000000000000000..a7ed7d6b6469e175d3949ffa9c502cbf
 +     *
 +     * @return the reload cause
 +     */
-+    @NotNull
 +    public Cause getCause() {
 +        return this.cause;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;

patches/api/0231-Add-BlockFailedDispenseEvent.patch

@@ -6,21 +6,23 @@ Subject: [PATCH] Add BlockFailedDispenseEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/BlockFailedDispenseEvent.java b/src/main/java/io/papermc/paper/event/block/BlockFailedDispenseEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..d531b034b49b163e5095e840a5c9c4fe5eb73319
+index 0000000000000000000000000000000000000000..03f91644189e2d1c615f0a22ab0a7c38c803f6c4
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BlockFailedDispenseEvent.java
-@@ -0,0 +1,56 @@
+@@ -0,0 +1,58 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.block.Block;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
++import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a block tries to dispense an item, but its inventory is empty.
 + */
++@NullMarked
 +public class BlockFailedDispenseEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -28,7 +30,7 @@ index 0000000000000000000000000000000000000000..d531b034b49b163e5095e840a5c9c4fe
 +    private boolean shouldPlayEffect = true;
 +
 +    @ApiStatus.Internal
-+    public BlockFailedDispenseEvent(@NotNull Block theBlock) {
++    public BlockFailedDispenseEvent(final Block theBlock) {
 +        super(theBlock);
 +    }
 +
@@ -44,7 +46,7 @@ index 0000000000000000000000000000000000000000..d531b034b49b163e5095e840a5c9c4fe
 +     *
 +     * @param playEffect if the effect should be played
 +     */
-+    public void shouldPlayEffect(boolean playEffect) {
++    public void shouldPlayEffect(final boolean playEffect) {
 +        this.shouldPlayEffect = playEffect;
 +    }
 +
@@ -58,11 +60,11 @@ index 0000000000000000000000000000000000000000..d531b034b49b163e5095e840a5c9c4fe
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/0238-Add-BlockPreDispenseEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add BlockPreDispenseEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java b/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..62547d5853e7355a805fa1e7f1e5f56d06fca4ba
+index 0000000000000000000000000000000000000000..fd10a34ec4e0731574cc7d69620e0b353ce8a21b
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java
-@@ -0,0 +1,65 @@
+@@ -0,0 +1,63 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.block.Block;
@@ -18,8 +18,9 @@ index 0000000000000000000000000000000000000000..62547d5853e7355a805fa1e7f1e5f56d
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class BlockPreDispenseEvent extends BlockEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..62547d5853e7355a805fa1e7f1e5f56d
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BlockPreDispenseEvent(@NotNull Block block, @NotNull ItemStack itemStack, int slot) {
++    public BlockPreDispenseEvent(final Block block, final ItemStack itemStack, final int slot) {
 +        super(block);
 +        this.itemStack = itemStack;
 +        this.slot = slot;
@@ -41,7 +42,6 @@ index 0000000000000000000000000000000000000000..62547d5853e7355a805fa1e7f1e5f56d
 +     *
 +     * @return The item to be dispensed
 +     */
-+    @NotNull
 +    public ItemStack getItemStack() {
 +        return this.itemStack;
 +    }
@@ -61,16 +61,14 @@ index 0000000000000000000000000000000000000000..62547d5853e7355a805fa1e7f1e5f56d
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0242-add-DragonEggFormEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] add DragonEggFormEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/DragonEggFormEvent.java b/src/main/java/io/papermc/paper/event/block/DragonEggFormEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..695c21a296c6d12e1204eba33b92c44e7c2d98b8
+index 0000000000000000000000000000000000000000..d0549d95985ff08af1fc1e6291e0124b766bf99d
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/DragonEggFormEvent.java
-@@ -0,0 +1,55 @@
+@@ -0,0 +1,53 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.Material;
@@ -20,7 +20,7 @@ index 0000000000000000000000000000000000000000..695c21a296c6d12e1204eba33b92c44e
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockFormEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when the {@link EnderDragon} is defeated (killed) in a {@link DragonBattle},
@@ -30,6 +30,7 @@ index 0000000000000000000000000000000000000000..695c21a296c6d12e1204eba33b92c44e
 + * <b>This event might be cancelled by default depending on
 + * e.g. {@link DragonBattle#hasBeenPreviouslyKilled()} and server configuration.</b>
 + */
++@NullMarked
 +public class DragonEggFormEvent extends BlockFormEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,7 +38,7 @@ index 0000000000000000000000000000000000000000..695c21a296c6d12e1204eba33b92c44e
 +    private final DragonBattle dragonBattle;
 +
 +    @ApiStatus.Internal
-+    public DragonEggFormEvent(@NotNull Block block, @NotNull BlockState newState, @NotNull DragonBattle dragonBattle) {
++    public DragonEggFormEvent(final Block block, final BlockState newState, final DragonBattle dragonBattle) {
 +        super(block, newState);
 +        this.dragonBattle = dragonBattle;
 +    }
@@ -49,18 +50,15 @@ index 0000000000000000000000000000000000000000..695c21a296c6d12e1204eba33b92c44e
 +     *
 +     * @return the dragon battle
 +     */
-+    @NotNull
 +    public DragonBattle getDragonBattle() {
 +        return this.dragonBattle;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0243-EntityMoveEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] EntityMoveEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityMoveEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityMoveEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd46c2ad77c
+index 0000000000000000000000000000000000000000..49ace395393839b3652a537207b4cf5b24beeac0
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityMoveEvent.java
-@@ -0,0 +1,150 @@
+@@ -0,0 +1,146 @@
 +package io.papermc.paper.event.entity;
 +
 +import com.google.common.base.Preconditions;
@@ -20,13 +20,14 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.event.player.PlayerMoveEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Holds information for living entity movement events
 + * <p>
 + * Does not fire for players; use {@link PlayerMoveEvent} for player movement.
 + */
++@NullMarked
 +public class EntityMoveEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,14 +38,13 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityMoveEvent(@NotNull LivingEntity entity, @NotNull Location from, @NotNull Location to) {
++    public EntityMoveEvent(final LivingEntity entity, final Location from, final Location to) {
 +        super(entity);
 +        this.from = from;
 +        this.to = to;
 +    }
 +
 +    @Override
-+    @NotNull
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
 +    }
@@ -54,7 +54,6 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     *
 +     * @return Location the entity moved from
 +     */
-+    @NotNull
 +    public Location getFrom() {
 +        return this.from;
 +    }
@@ -64,8 +63,8 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     *
 +     * @param from New location to mark as the entity's previous location
 +     */
-+    public void setFrom(@NotNull Location from) {
++    public void setFrom(final Location from) {
-+        validateLocation(from);
++        this.validateLocation(from);
 +        this.from = from;
 +    }
 +
@@ -74,7 +73,6 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     *
 +     * @return Location the entity moved to
 +     */
-+    @NotNull
 +    public Location getTo() {
 +        return this.to;
 +    }
@@ -84,8 +82,8 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     *
 +     * @param to New Location this entity will move to
 +     */
-+    public void setTo(@NotNull Location to) {
++    public void setTo(final Location to) {
-+        validateLocation(to);
++        this.validateLocation(to);
 +        this.to = to;
 +    }
 +
@@ -95,7 +93,7 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     * @return whether the entity has changed position or not
 +     */
 +    public boolean hasChangedPosition() {
-+        return hasExplicitlyChangedPosition() || !this.from.getWorld().equals(this.to.getWorld());
++        return this.hasExplicitlyChangedPosition() || !this.from.getWorld().equals(this.to.getWorld());
 +    }
 +
 +    /**
@@ -113,7 +111,7 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +     * @return whether the entity has moved to a new block or not
 +     */
 +    public boolean hasChangedBlock() {
-+        return hasExplicitlyChangedBlock() || !from.getWorld().equals(to.getWorld());
++        return this.hasExplicitlyChangedBlock() || !this.from.getWorld().equals(this.to.getWorld());
 +    }
 +
 +    /**
@@ -134,7 +132,7 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +        return this.from.getPitch() != this.to.getPitch() || this.from.getYaw() != this.to.getYaw();
 +    }
 +
-+    private void validateLocation(@NotNull Location loc) {
++    private void validateLocation(final Location loc) {
 +        Preconditions.checkArgument(loc != null, "Cannot use null location!");
 +        Preconditions.checkArgument(loc.getWorld() != null, "Cannot use null location with null world!");
 +    }
@@ -145,17 +143,15 @@ index 0000000000000000000000000000000000000000..46990a220f70b04218b14aec1e9efbd4
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
 +    @Override
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0262-Introduce-beacon-activation-deactivation-events.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Introduce beacon activation/deactivation events
 
 diff --git a/src/main/java/io/papermc/paper/event/block/BeaconActivatedEvent.java b/src/main/java/io/papermc/paper/event/block/BeaconActivatedEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..05609ec9df637c9aa53528218cbc8cda30f0aea1
+index 0000000000000000000000000000000000000000..380538656e675fdfaf9077da8ff48dc5c427a657
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BeaconActivatedEvent.java
-@@ -0,0 +1,43 @@
+@@ -0,0 +1,41 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.block.Beacon;
@@ -17,18 +17,19 @@ index 0000000000000000000000000000000000000000..05609ec9df637c9aa53528218cbc8cda
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a beacon is activated.
 + * Activation occurs when the beacon beam becomes visible.
 + */
++@NullMarked
 +public class BeaconActivatedEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    @ApiStatus.Internal
-+    public BeaconActivatedEvent(@NotNull Block block) {
++    public BeaconActivatedEvent(final Block block) {
 +        super(block);
 +    }
 +
@@ -37,28 +38,25 @@ index 0000000000000000000000000000000000000000..05609ec9df637c9aa53528218cbc8cda
 +     *
 +     * @return the beacon that was activated.
 +     */
-+    @NotNull
 +    public Beacon getBeacon() {
 +        return (Beacon) this.block.getState();
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}
 diff --git a/src/main/java/io/papermc/paper/event/block/BeaconDeactivatedEvent.java b/src/main/java/io/papermc/paper/event/block/BeaconDeactivatedEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..dc106d6bfbd9d0ab84b17597d71381a5c0b07d64
+index 0000000000000000000000000000000000000000..4e5b2b2413e2aae03132ecd76123cd93dfbd77ce
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BeaconDeactivatedEvent.java
-@@ -0,0 +1,46 @@
+@@ -0,0 +1,44 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.Material;
@@ -67,18 +65,19 @@ index 0000000000000000000000000000000000000000..dc106d6bfbd9d0ab84b17597d71381a5
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when a beacon is deactivated, either because its base block(s) or itself were destroyed.
 + */
++@NullMarked
 +public class BeaconDeactivatedEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    @ApiStatus.Internal
-+    public BeaconDeactivatedEvent(@NotNull Block block) {
++    public BeaconDeactivatedEvent(final Block block) {
 +        super(block);
 +    }
 +
@@ -89,18 +88,15 @@ index 0000000000000000000000000000000000000000..dc106d6bfbd9d0ab84b17597d71381a5
 +     *
 +     * @return The beacon that got deactivated, or {@code null} if it does not exist.
 +     */
-+    @Nullable
++    public @Nullable Beacon getBeacon() {
-+    public Beacon getBeacon() {
 +        return this.block.getType() == Material.BEACON ? (Beacon) this.block.getState() : null;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0276-Add-EntityInsideBlockEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add EntityInsideBlockEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae24471a16d622
+index 0000000000000000000000000000000000000000..314aab3eb4c802e6ebbe5a4ee7d5fbbd3f504c1b
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java
-@@ -0,0 +1,87 @@
+@@ -0,0 +1,85 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.block.Block;
@@ -18,7 +18,7 @@ index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae2447
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity enters the hitbox of a block.
@@ -53,6 +53,7 @@ index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae2447
 + *     <li>Wither rose</li>
 + * </ul>
 + */
++@NullMarked
 +public class EntityInsideBlockEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -61,7 +62,7 @@ index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae2447
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityInsideBlockEvent(@NotNull Entity entity, @NotNull Block block) {
++    public EntityInsideBlockEvent(final Entity entity, final Block block) {
 +        super(entity);
 +        this.block = block;
 +    }
@@ -71,7 +72,6 @@ index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae2447
 +     *
 +     * @return the block
 +     */
-+    @NotNull
 +    public Block getBlock() {
 +        return this.block;
 +    }
@@ -82,17 +82,15 @@ index 0000000000000000000000000000000000000000..b162d4b6f12c0d7d3542ada3bdae2447
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0281-Add-PufferFishStateChangeEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add PufferFishStateChangeEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/PufferFishStateChangeEvent.java b/src/main/java/io/papermc/paper/event/entity/PufferFishStateChangeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..4e04b49c1e2bc2a965c9be2388539d9ed5a58f89
+index 0000000000000000000000000000000000000000..b4521d64eefd8f871f8ce78734e6626896e8b0d0
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/PufferFishStateChangeEvent.java
-@@ -0,0 +1,87 @@
+@@ -0,0 +1,85 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.PufferFish;
@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..4e04b49c1e2bc2a965c9be2388539d9e
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called just before a {@link PufferFish} inflates or deflates.
 + */
++@NullMarked
 +public class PufferFishStateChangeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,12 +31,11 @@ index 0000000000000000000000000000000000000000..4e04b49c1e2bc2a965c9be2388539d9e
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PufferFishStateChangeEvent(@NotNull PufferFish entity, int newPuffState) {
++    public PufferFishStateChangeEvent(final PufferFish entity, final int newPuffState) {
 +        super(entity);
 +        this.newPuffState = newPuffState;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public PufferFish getEntity() {
 +        return (PufferFish) super.getEntity();
@@ -77,7 +77,7 @@ index 0000000000000000000000000000000000000000..4e04b49c1e2bc2a965c9be2388539d9e
 +     * @param cancel {@code true} if you wish to cancel the (in/de)flation
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
@@ -86,13 +86,11 @@ index 0000000000000000000000000000000000000000..4e04b49c1e2bc2a965c9be2388539d9e
 +        return this.cancelled;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0283-Add-ElderGuardianAppearanceEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add ElderGuardianAppearanceEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/ElderGuardianAppearanceEvent.java b/src/main/java/io/papermc/paper/event/entity/ElderGuardianAppearanceEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5c9940b89
+index 0000000000000000000000000000000000000000..272a4a06e766291aeee4f9e19a1ed26aa62e569a
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/ElderGuardianAppearanceEvent.java
-@@ -0,0 +1,67 @@
+@@ -0,0 +1,64 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.ElderGuardian;
@@ -18,11 +18,12 @@ index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Is called when an {@link ElderGuardian} appears in front of a {@link Player}.
 + */
++@NullMarked
 +public class ElderGuardianAppearanceEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,7 +32,7 @@ index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ElderGuardianAppearanceEvent(@NotNull ElderGuardian guardian, @NotNull Player affectedPlayer) {
++    public ElderGuardianAppearanceEvent(final ElderGuardian guardian, final Player affectedPlayer) {
 +        super(guardian);
 +        this.affectedPlayer = affectedPlayer;
 +    }
@@ -41,7 +42,6 @@ index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5
 +     *
 +     * @return Player affected by the appearance
 +     */
-+    @NotNull
 +    public Player getAffectedPlayer() {
 +        return this.affectedPlayer;
 +    }
@@ -51,7 +51,6 @@ index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5
 +     *
 +     * @return The elder guardian
 +     */
-+    @NotNull
 +    public ElderGuardian getEntity() {
 +        return (ElderGuardian) super.getEntity();
 +    }
@@ -62,17 +61,15 @@ index 0000000000000000000000000000000000000000..47eabdc8b1a3a3207f197eeca00f3ca5
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0285-Add-WaterBottleSplashEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add WaterBottleSplashEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/WaterBottleSplashEvent.java b/src/main/java/io/papermc/paper/event/entity/WaterBottleSplashEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405389f431a
+index 0000000000000000000000000000000000000000..1f74ea11c726273c3c2a7fc6f381716e230ef5c9
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/WaterBottleSplashEvent.java
-@@ -0,0 +1,137 @@
+@@ -0,0 +1,135 @@
 +package io.papermc.paper.event.entity;
 +
 +import java.util.Collection;
@@ -23,28 +23,29 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +import org.bukkit.entity.ThrownPotion;
 +import org.bukkit.event.entity.PotionSplashEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
-+import org.jetbrains.annotations.Nullable;
 +import org.jetbrains.annotations.Unmodifiable;
++import org.jspecify.annotations.NullMarked;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when a splash water potion "splashes" and affects
 + * different entities in different ways.
 + */
++@NullMarked
 +public class WaterBottleSplashEvent extends PotionSplashEvent {
 +
-+    private final @NotNull Set<LivingEntity> rehydrate;
++    private final Set<LivingEntity> rehydrate;
-+    private final @NotNull Set<LivingEntity> extinguish;
++    private final Set<LivingEntity> extinguish;
 +
 +    @ApiStatus.Internal
 +    public WaterBottleSplashEvent(
-+        final @NotNull ThrownPotion potion,
++        final ThrownPotion potion,
 +        final @Nullable Entity hitEntity,
 +        final @Nullable Block hitBlock,
 +        final @Nullable BlockFace hitFace,
-+        final @NotNull Map<LivingEntity, Double> affectedEntities,
++        final Map<LivingEntity, Double> affectedEntities,
-+        final @NotNull Set<LivingEntity> rehydrate,
++        final Set<LivingEntity> rehydrate,
-+        final @NotNull Set<LivingEntity> extinguish
++        final Set<LivingEntity> extinguish
 +    ) {
 +        super(potion, hitEntity, hitBlock, hitFace, affectedEntities);
 +        this.rehydrate = rehydrate;
@@ -61,7 +62,6 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     * @see #doNotDamageAsWaterSensitive(LivingEntity)
 +     * @see #damageAsWaterSensitive(LivingEntity)
 +     */
-+    @NotNull
 +    public @Unmodifiable Collection<LivingEntity> getToDamage() {
 +        return this.affectedEntities.entrySet().stream().filter(entry -> entry.getValue() > 0).map(Map.Entry::getKey).collect(Collectors.toUnmodifiableSet());
 +    }
@@ -72,7 +72,7 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     *
 +     * @param entity entity to remove
 +     */
-+    public void doNotDamageAsWaterSensitive(final @NotNull LivingEntity entity) {
++    public void doNotDamageAsWaterSensitive(final LivingEntity entity) {
 +        this.affectedEntities.remove(entity);
 +    }
 +
@@ -82,7 +82,7 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     *
 +     * @param entity entity to add
 +     */
-+    public void damageAsWaterSensitive(final @NotNull LivingEntity entity) {
++    public void damageAsWaterSensitive(final LivingEntity entity) {
 +        this.affectedEntities.put(entity, 1.0);
 +    }
 +
@@ -96,7 +96,6 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     *
 +     * @return the entities
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getToRehydrate() {
 +        return this.rehydrate;
 +    }
@@ -107,7 +106,6 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     *
 +     * @return entities to be extinguished
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getToExtinguish() {
 +        return this.extinguish;
 +    }
@@ -118,7 +116,7 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public @NotNull Collection<LivingEntity> getAffectedEntities() {
++    public Collection<LivingEntity> getAffectedEntities() {
 +        return super.getAffectedEntities();
 +    }
 +
@@ -130,7 +128,7 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public double getIntensity(final @NotNull LivingEntity entity) {
++    public double getIntensity(final LivingEntity entity) {
 +        return super.getIntensity(entity);
 +    }
 +
@@ -143,7 +141,7 @@ index 0000000000000000000000000000000000000000..0c7725980d5a2f3652e53f75329ad405
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public void setIntensity(final @NotNull LivingEntity entity, final double intensity) {
++    public void setIntensity(final LivingEntity entity, final double intensity) {
 +        super.setIntensity(entity, intensity);
 +    }
 +}

patches/api/0294-Added-EntityDamageItemEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Added EntityDamageItemEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityDamageItemEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityDamageItemEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be0620af2e
+index 0000000000000000000000000000000000000000..c4cc0931892f949b7314d241dbe80caeceab4331
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityDamageItemEvent.java
-@@ -0,0 +1,81 @@
+@@ -0,0 +1,79 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.Entity;
@@ -18,7 +18,7 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item on or used by an entity takes durability damage as a result of being hit/used.
@@ -26,6 +26,7 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 + * NOTE: default vanilla behaviour dictates that armor/tools picked up by
 + * mobs do not take damage (except via Thorns).
 + */
++@NullMarked
 +public class EntityDamageItemEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -36,7 +37,7 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityDamageItemEvent(@NotNull Entity entity, @NotNull ItemStack item, int damage) {
++    public EntityDamageItemEvent(final Entity entity, final ItemStack item, final int damage) {
 +        super(entity);
 +        this.item = item;
 +        this.damage = damage;
@@ -47,7 +48,6 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 +     *
 +     * @return the item
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -66,7 +66,7 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 +     *
 +     * @param damage the damage amount to cause
 +     */
-+    public void setDamage(int damage) {
++    public void setDamage(final int damage) {
 +        this.damage = damage;
 +    }
 +
@@ -76,17 +76,15 @@ index 0000000000000000000000000000000000000000..72ac972dea684a3ffac3bd48726746be
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0297-Add-BlockBreakBlockEvent.patch

@@ -6,26 +6,26 @@ Subject: [PATCH] Add BlockBreakBlockEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/BlockBreakBlockEvent.java b/src/main/java/io/papermc/paper/event/block/BlockBreakBlockEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..4f7535daf0d9967fadb0c6f8afbd3993eace410d
+index 0000000000000000000000000000000000000000..3b130d145f54939ad02e30b15c81120aac2078c2
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BlockBreakBlockEvent.java
-@@ -0,0 +1,61 @@
+@@ -0,0 +1,57 @@
 +package io.papermc.paper.event.block;
 +
++import java.util.List;
 +import org.bukkit.block.Block;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockExpEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Called when a block forces another block to break and drop items.
 + * <p>
 + * Currently called for piston's and liquid flows.
 + */
++@NullMarked
 +public class BlockBreakBlockEvent extends BlockExpEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,18 +34,17 @@ index 0000000000000000000000000000000000000000..4f7535daf0d9967fadb0c6f8afbd3993
 +    private final List<ItemStack> drops;
 +
 +    @ApiStatus.Internal
-+    public BlockBreakBlockEvent(@NotNull Block block, @NotNull Block source, @NotNull List<ItemStack> drops) {
++    public BlockBreakBlockEvent(final Block block, final Block source, final List<ItemStack> drops) {
 +        super(block, 0);
 +        this.source = source;
 +        this.drops = drops;
 +    }
 +
 +    /**
-+     * Gets the drops of this event
++     * Gets a mutable list of drops for this event
 +     *
 +     * @return the drops
 +     */
-+    @NotNull
 +    public List<ItemStack> getDrops() {
 +        return this.drops;
 +    }
@@ -55,18 +54,15 @@ index 0000000000000000000000000000000000000000..4f7535daf0d9967fadb0c6f8afbd3993
 +     *
 +     * @return the source
 +     */
-+    @NotNull
 +    public Block getSource() {
 +        return this.source;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0341-Add-TameableDeathMessageEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add TameableDeathMessageEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/TameableDeathMessageEvent.java b/src/main/java/io/papermc/paper/event/entity/TameableDeathMessageEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8f99dc156
+index 0000000000000000000000000000000000000000..b956ef8f95156c225741f53811b4a36963da6616
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/TameableDeathMessageEvent.java
-@@ -0,0 +1,72 @@
+@@ -0,0 +1,69 @@
 +package io.papermc.paper.event.entity;
 +
 +import net.kyori.adventure.text.Component;
@@ -18,11 +18,12 @@ index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a {@link Tameable} dies and sends a death message.
 + */
++@NullMarked
 +public class TameableDeathMessageEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,7 +32,7 @@ index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TameableDeathMessageEvent(@NotNull Tameable tameable, @NotNull Component deathMessage) {
++    public TameableDeathMessageEvent(final Tameable tameable, final Component deathMessage) {
 +        super(tameable);
 +        this.deathMessage = deathMessage;
 +    }
@@ -41,7 +42,7 @@ index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8
 +     *
 +     * @param deathMessage Death message to appear
 +     */
-+    public void deathMessage(@NotNull Component deathMessage) {
++    public void deathMessage(final Component deathMessage) {
 +        this.deathMessage = deathMessage;
 +    }
 +
@@ -50,12 +51,10 @@ index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8
 +     *
 +     * @return Death message to appear
 +     */
-+    @NotNull
 +    public Component deathMessage() {
 +        return this.deathMessage;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Tameable getEntity() {
 +        return (Tameable) super.getEntity();
@@ -67,17 +66,15 @@ index 0000000000000000000000000000000000000000..5d449b90829bca7a6ff3060b637561d8
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0346-Add-EntityDyeEvent-and-CollarColorable-interface.patch

@@ -37,10 +37,10 @@ index 0000000000000000000000000000000000000000..bb68e6a2528eee81eb3f26f22b9c3550
 +}
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityDyeEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityDyeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..c43a3ad32902dbb13287e801375213745ce07b3c
+index 0000000000000000000000000000000000000000..049471bac6c9b830fe7717c129173a723091963f
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityDyeEvent.java
-@@ -0,0 +1,81 @@
+@@ -0,0 +1,82 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.DyeColor;
@@ -53,24 +53,25 @@ index 0000000000000000000000000000000000000000..c43a3ad32902dbb13287e80137521374
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an entity is dyed. Currently, this is called for {@link Sheep}
 + * being dyed, and {@link Wolf}/{@link Cat} collars being dyed.
 + */
++@NullMarked
 +public class EntityDyeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    private final Player player;
++    private final @Nullable Player player;
 +    private DyeColor dyeColor;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityDyeEvent(@NotNull Entity entity, @NotNull DyeColor dyeColor, @Nullable Player player) {
++    public EntityDyeEvent(final Entity entity, final DyeColor dyeColor, final @Nullable Player player) {
 +        super(entity);
 +        this.dyeColor = dyeColor;
 +        this.player = player;
@@ -81,7 +82,7 @@ index 0000000000000000000000000000000000000000..c43a3ad32902dbb13287e80137521374
 +     *
 +     * @return the DyeColor the entity is being dyed
 +     */
-+    public @NotNull DyeColor getColor() {
++    public DyeColor getColor() {
 +        return this.dyeColor;
 +    }
 +
@@ -90,7 +91,7 @@ index 0000000000000000000000000000000000000000..c43a3ad32902dbb13287e80137521374
 +     *
 +     * @param dyeColor the DyeColor the entity will be dyed
 +     */
-+    public void setColor(@NotNull DyeColor dyeColor) {
++    public void setColor(final DyeColor dyeColor) {
 +        this.dyeColor = dyeColor;
 +    }
 +
@@ -109,16 +110,16 @@ index 0000000000000000000000000000000000000000..c43a3ad32902dbb13287e80137521374
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/0350-Add-WardenAngerChangeEvent.patch

@@ -8,10 +8,10 @@ another entity.
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/WardenAngerChangeEvent.java b/src/main/java/io/papermc/paper/event/entity/WardenAngerChangeEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2ab6c0244e
+index 0000000000000000000000000000000000000000..7c06de67121f92f6e1e8890f250157721c78e627
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/WardenAngerChangeEvent.java
-@@ -0,0 +1,108 @@
+@@ -0,0 +1,103 @@
 +package io.papermc.paper.event.entity;
 +
 +import com.google.common.base.Preconditions;
@@ -21,14 +21,15 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Warden's anger level has changed due to another entity.
 + * <p>
 + * If the event is cancelled, the warden's anger level will not change.
 + */
++@NullMarked
 +public class WardenAngerChangeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -40,7 +41,7 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WardenAngerChangeEvent(@NotNull final Warden warden, @NotNull final Entity target, final int oldAnger, final int newAnger) {
++    public WardenAngerChangeEvent(final Warden warden, final Entity target, final int oldAnger, final int newAnger) {
 +        super(warden);
 +        this.target = target;
 +        this.oldAnger = oldAnger;
@@ -52,7 +53,6 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +     *
 +     * @return triggering entity
 +     */
-+    @NotNull
 +    public Entity getTarget() {
 +        return this.target;
 +    }
@@ -63,8 +63,7 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +     * @return old anger level
 +     * @see Warden#getAnger(Entity)
 +     */
-+    @Range(from = 0, to = 150)
++    public @Range(from = 0, to = 150) int getOldAnger() {
-+    public int getOldAnger() {
 +        return this.oldAnger;
 +    }
 +
@@ -74,8 +73,7 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +     * @return new anger level
 +     * @see Warden#getAnger(Entity)
 +     */
-+    @Range(from = 0, to = 150)
++    public @Range(from = 0, to = 150) int getNewAnger() {
-+    public int getNewAnger() {
 +        return this.newAnger;
 +    }
 +
@@ -85,15 +83,14 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +     * The anger of a warden is capped at 150.
 +     *
 +     * @param newAnger the new anger level, max 150
-+     * @see Warden#setAnger(Entity, int)
 +     * @throws IllegalArgumentException if newAnger is greater than 150
++     * @see Warden#setAnger(Entity, int)
 +     */
-+    public void setNewAnger(@Range(from = 0, to = 150) int newAnger) {
++    public void setNewAnger(final @Range(from = 0, to = 150) int newAnger) {
 +        Preconditions.checkArgument(newAnger <= 150, "newAnger must not be greater than 150");
 +        this.newAnger = newAnger;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Warden getEntity() {
 +        return (Warden) super.getEntity();
@@ -105,17 +102,15 @@ index 0000000000000000000000000000000000000000..7f738c1116feae8e8571488d516fab2a
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0354-Add-EntityPortalReadyEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add EntityPortalReadyEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityPortalReadyEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityPortalReadyEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..3450735c86a8af45491c010a796262ae892f14dc
+index 0000000000000000000000000000000000000000..bc5f0ed43f5d341ec551e48eecf2614cdfd52d79
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityPortalReadyEvent.java
-@@ -0,0 +1,94 @@
+@@ -0,0 +1,95 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.PortalType;
@@ -21,28 +21,29 @@ index 0000000000000000000000000000000000000000..3450735c86a8af45491c010a796262ae
 +import org.bukkit.event.entity.EntityPortalEvent;
 +import org.bukkit.event.player.PlayerPortalEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an entity is ready to be teleported by a plugin.
-+ * Currently this is only called after the required
++ * Currently, this is only called after the required
 + * ticks have passed for a Nether Portal.
 + * <p>
 + * Cancelling this event resets the entity's readiness
 + * regarding the current portal.
 + */
++@NullMarked
 +public class EntityPortalReadyEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final PortalType portalType;
-+    private World targetWorld;
++    private @Nullable World targetWorld;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityPortalReadyEvent(final @NotNull Entity entity, final @Nullable World targetWorld, final @NotNull PortalType portalType) {
++    public EntityPortalReadyEvent(final Entity entity, final @Nullable World targetWorld, final PortalType portalType) {
 +        super(entity);
 +        this.targetWorld = targetWorld;
 +        this.portalType = portalType;
@@ -81,7 +82,7 @@ index 0000000000000000000000000000000000000000..3450735c86a8af45491c010a796262ae
 +     *
 +     * @return the portal type
 +     */
-+    public @NotNull PortalType getPortalType() {
++    public PortalType getPortalType() {
 +        return this.portalType;
 +    }
 +
@@ -96,11 +97,11 @@ index 0000000000000000000000000000000000000000..3450735c86a8af45491c010a796262ae
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/0368-Added-EntityToggleSitEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Added EntityToggleSitEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityToggleSitEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityToggleSitEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..06222a8c7a19909582a00fd2e1553cc0be9d88e3
+index 0000000000000000000000000000000000000000..ab1955bc61114798fe71cffa6fae3ee0beb3bd2a
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityToggleSitEvent.java
-@@ -0,0 +1,55 @@
+@@ -0,0 +1,54 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.Entity;
@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..06222a8c7a19909582a00fd2e1553cc0
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Is called when an entity sits down or stands up.
 + */
++@NullMarked
 +public class EntityToggleSitEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..06222a8c7a19909582a00fd2e1553cc0
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityToggleSitEvent(@NotNull Entity entity, boolean isSitting) {
++    public EntityToggleSitEvent(final Entity entity, final boolean isSitting) {
 +        super(entity);
 +        this.isSitting = isSitting;
 +    }
@@ -50,17 +51,15 @@ index 0000000000000000000000000000000000000000..06222a8c7a19909582a00fd2e1553cc0
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0380-Add-BlockLockCheckEvent.patch

@@ -23,7 +23,7 @@ index 0000000000000000000000000000000000000000..f309961e0e96b6baacc4fe6d80dabd6c
 +}
 diff --git a/src/main/java/io/papermc/paper/event/block/BlockLockCheckEvent.java b/src/main/java/io/papermc/paper/event/block/BlockLockCheckEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836e78d7b68
+index 0000000000000000000000000000000000000000..f08d390f0ee9357dcc229d7a2520da602677d9ef
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BlockLockCheckEvent.java
 @@ -0,0 +1,187 @@
@@ -31,6 +31,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +
 +import com.google.common.base.Preconditions;
 +import io.papermc.paper.block.LockableTileState;
++import java.util.Objects;
 +import net.kyori.adventure.sound.Sound;
 +import net.kyori.adventure.text.Component;
 +import org.bukkit.block.Block;
@@ -40,28 +41,27 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
-+
-+import java.util.Objects;
 +
 +/**
 + * Called when the server tries to check the lock on a lockable block entity.
 + * <br>
 + * See {@link #setResult(Result)} to change behavior
 + */
++@NullMarked
 +public class BlockLockCheckEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final Player player;
-+    private Component lockedMessage;
++    private @Nullable Component lockedMessage;
-+    private Sound lockedSound;
++    private @Nullable Sound lockedSound;
-+    private ItemStack itemStack;
++    private @Nullable ItemStack itemStack;
 +    private Result result = Result.DEFAULT;
 +
 +    @ApiStatus.Internal
-+    public BlockLockCheckEvent(final @NotNull Block block, final @NotNull Player player, final @NotNull Component lockedMessage, final @NotNull Sound lockedSound) {
++    public BlockLockCheckEvent(final Block block, final Player player, final Component lockedMessage, final Sound lockedSound) {
 +        super(block);
 +        this.player = player;
 +        this.lockedMessage = lockedMessage;
@@ -74,7 +74,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     *
 +     * @return the snapshot block state.
 +     */
-+    public @NotNull LockableTileState getBlockState() {
++    public LockableTileState getBlockState() {
 +        final BlockState blockState = this.getBlock().getState();
 +        Preconditions.checkState(blockState instanceof LockableTileState, "Block state of lock-checked block is no longer a lockable tile state!");
 +        return (LockableTileState) blockState;
@@ -85,7 +85,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     *
 +     * @return the player
 +     */
-+    public @NotNull Player getPlayer() {
++    public Player getPlayer() {
 +        return this.player;
 +    }
 +
@@ -98,7 +98,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     * @return the item being used as the key item
 +     * @see #isUsingCustomKeyItemStack()
 +     */
-+    public @NotNull ItemStack getKeyItem() {
++    public ItemStack getKeyItem() {
 +        return Objects.requireNonNullElseGet(this.itemStack, this.player.getInventory()::getItemInMainHand);
 +    }
 +
@@ -108,7 +108,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     * @param stack the stack to use as a key
 +     * @see #resetKeyItem() to clear a custom key item
 +     */
-+    public void setKeyItem(@NotNull ItemStack stack) {
++    public void setKeyItem(final ItemStack stack) {
 +        Preconditions.checkArgument(stack != null, "stack cannot be null");
 +        this.itemStack = stack;
 +    }
@@ -135,7 +135,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     * @return the result
 +     * @see #setResult(Result)
 +     */
-+    public @NotNull Result getResult() {
++    public Result getResult() {
 +        return this.result;
 +    }
 +
@@ -148,7 +148,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     *
 +     * @param result the result of this event
 +     */
-+    public void setResult(@NotNull Result result) {
++    public void setResult(final Result result) {
 +        this.result = result;
 +    }
 +
@@ -157,9 +157,9 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     * the locked message and locked sound.
 +     *
 +     * @param lockedMessage the message to show if locked (or {@code null} for none)
-+     * @param lockedSound the sound to play if locked (or {@code null} for none)
++     * @param lockedSound   the sound to play if locked (or {@code null} for none)
 +     */
-+    public void denyWithMessageAndSound(@Nullable Component lockedMessage, @Nullable Sound lockedSound) {
++    public void denyWithMessageAndSound(final @Nullable Component lockedMessage, final @Nullable Sound lockedSound) {
 +        this.result = Result.DENY;
 +        this.lockedMessage = lockedMessage;
 +        this.lockedSound = lockedSound;
@@ -181,7 +181,7 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     *
 +     * @param lockedMessage the locked message (or {@code null} for none)
 +     */
-+    public void setLockedMessage(@Nullable Component lockedMessage) {
++    public void setLockedMessage(final @Nullable Component lockedMessage) {
 +        this.lockedMessage = lockedMessage;
 +    }
 +
@@ -201,16 +201,16 @@ index 0000000000000000000000000000000000000000..5e2c8ad26dea2c8a84ae10f7da8cb836
 +     *
 +     * @param lockedSound the locked sound (or {@code null} for none)
 +     */
-+    public void setLockedSound(@Nullable Sound lockedSound) {
++    public void setLockedSound(final @Nullable Sound lockedSound) {
 +        this.lockedSound = lockedSound;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/0388-Add-EntityFertilizeEggEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add EntityFertilizeEggEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9b87d7ae8
+index 0000000000000000000000000000000000000000..a96c28678c5f6a52710ae287d3bbc25e180d058e
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java
-@@ -0,0 +1,139 @@
+@@ -0,0 +1,133 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.Material;
@@ -21,8 +21,8 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when two entities mate and the mating process results in a fertilization.
@@ -35,23 +35,24 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 + * <li>Sniffers producing the {@link Material#SNIFFER_EGG} item, which needs to be placed before it can begin to hatch.</li>
 + * <li>A turtle being marked with "HasEgg" and laying a {@link Material#TURTLE_EGG} later.</li>
 + * </ul>
-+ *
++ * <p>
 + * The event hence only exposes the two parent entities in the fertilization process and cannot provide the child entity, as it will only exist at a later point in time.
 + */
++@NullMarked
 +public class EntityFertilizeEggEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final LivingEntity mother;
 +    private final LivingEntity father;
-+    private final Player breeder;
++    private final @Nullable Player breeder;
-+    private final ItemStack bredWith;
++    private final @Nullable ItemStack bredWith;
 +    private int experience;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityFertilizeEggEvent(@NotNull LivingEntity mother, @NotNull LivingEntity father, @Nullable Player breeder, @Nullable ItemStack bredWith, int experience) {
++    public EntityFertilizeEggEvent(final LivingEntity mother, final LivingEntity father, final @Nullable Player breeder, final @Nullable ItemStack bredWith, final int experience) {
 +        super(mother);
 +        this.mother = mother;
 +        this.father = father;
@@ -60,7 +61,6 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +        this.experience = experience;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -72,7 +72,6 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +     *
 +     * @return The "mother" entity.
 +     */
-+    @NotNull
 +    public LivingEntity getMother() {
 +        return this.mother;
 +    }
@@ -83,7 +82,6 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +     *
 +     * @return the other parent
 +     */
-+    @NotNull
 +    public LivingEntity getFather() {
 +        return this.father;
 +    }
@@ -94,8 +92,7 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +     *
 +     * @return The Entity who initiated fertilization.
 +     */
-+    @Nullable
++    public @Nullable Player getBreeder() {
-+    public Player getBreeder() {
 +        return this.breeder;
 +    }
 +
@@ -104,8 +101,7 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +     *
 +     * @return ItemStack used to initiate fertilization.
 +     */
-+    @Nullable
++    public @Nullable ItemStack getBredWith() {
-+    public ItemStack getBredWith() {
 +        return this.bredWith;
 +    }
 +
@@ -124,7 +120,7 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +     *
 +     * @param experience experience amount
 +     */
-+    public void setExperience(int experience) {
++    public void setExperience(final int experience) {
 +        this.experience = experience;
 +    }
 +
@@ -134,17 +130,15 @@ index 0000000000000000000000000000000000000000..35d54650c53bc64dd7c440240ad2f2b9
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0389-Add-CompostItemEvent-and-EntityCompostItemEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add CompostItemEvent and EntityCompostItemEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/CompostItemEvent.java b/src/main/java/io/papermc/paper/event/block/CompostItemEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef43f45be9a
+index 0000000000000000000000000000000000000000..03497ac2489b159716811f03ab68e345ff864fa6
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/CompostItemEvent.java
-@@ -0,0 +1,67 @@
+@@ -0,0 +1,66 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.block.Block;
@@ -18,12 +18,13 @@ index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef4
 +import org.bukkit.event.inventory.InventoryMoveItemEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item is about to be composted by a hopper.
 + * To prevent hoppers from moving items into composters, cancel the {@link InventoryMoveItemEvent}.
 + */
++@NullMarked
 +public class CompostItemEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,7 +33,7 @@ index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef4
 +    private boolean willRaiseLevel;
 +
 +    @ApiStatus.Internal
-+    public CompostItemEvent(@NotNull Block composter, @NotNull ItemStack item, boolean willRaiseLevel) {
++    public CompostItemEvent(final Block composter, final ItemStack item, final boolean willRaiseLevel) {
 +        super(composter);
 +        this.item = item;
 +        this.willRaiseLevel = willRaiseLevel;
@@ -43,7 +44,6 @@ index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef4
 +     *
 +     * @return the item
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -62,16 +62,15 @@ index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef4
 +     *
 +     * @param willRaiseLevel {@code true} if the composter should rise a level
 +     */
-+    public void setWillRaiseLevel(boolean willRaiseLevel) {
++    public void setWillRaiseLevel(final boolean willRaiseLevel) {
 +        this.willRaiseLevel = willRaiseLevel;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -79,7 +78,7 @@ index 0000000000000000000000000000000000000000..29f21c03cc063a279ca4ae0be00e9ef4
 +}
 diff --git a/src/main/java/io/papermc/paper/event/entity/EntityCompostItemEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityCompostItemEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..ba8473ec936b1cea8b13b269283c377cb1b6da0b
+index 0000000000000000000000000000000000000000..213d957fdc68aa32d77424c84c5cf3b244cd4314
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/EntityCompostItemEvent.java
 @@ -0,0 +1,45 @@
@@ -91,18 +90,19 @@ index 0000000000000000000000000000000000000000..ba8473ec936b1cea8b13b269283c377c
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item is about to be composted by an entity.
 + */
++@NullMarked
 +public class EntityCompostItemEvent extends CompostItemEvent implements Cancellable {
 +
 +    private final Entity entity;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityCompostItemEvent(@NotNull Entity entity, @NotNull Block composter, @NotNull ItemStack item, boolean willRaiseLevel) {
++    public EntityCompostItemEvent(final Entity entity, final Block composter, final ItemStack item, final boolean willRaiseLevel) {
 +        super(composter, item, willRaiseLevel);
 +        this.entity = entity;
 +    }
@@ -112,7 +112,6 @@ index 0000000000000000000000000000000000000000..ba8473ec936b1cea8b13b269283c377c
 +     *
 +     * @return the entity that composted an item.
 +     */
-+    @NotNull
 +    public Entity getEntity() {
 +        return this.entity;
 +    }
@@ -123,7 +122,7 @@ index 0000000000000000000000000000000000000000..ba8473ec936b1cea8b13b269283c377c
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +

patches/api/0399-Add-whitelist-events.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add whitelist events
 
 diff --git a/src/main/java/io/papermc/paper/event/server/WhitelistStateUpdateEvent.java b/src/main/java/io/papermc/paper/event/server/WhitelistStateUpdateEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73ccc8779f
+index 0000000000000000000000000000000000000000..ff8c2c74fc68b1dd564e07c938b28b5950871533
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/server/WhitelistStateUpdateEvent.java
-@@ -0,0 +1,87 @@
+@@ -0,0 +1,83 @@
 +package io.papermc.paper.event.server;
 +
 +import com.destroystokyo.paper.profile.PlayerProfile;
@@ -19,22 +19,23 @@ index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event gets called when the whitelist status of a player is changed
 + */
++@NullMarked
 +public class WhitelistStateUpdateEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final PlayerProfile playerProfile;
++    private final PlayerProfile playerProfile;
-+    @NotNull private final WhitelistStatus status;
++    private final WhitelistStatus status;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WhitelistStateUpdateEvent(@NotNull PlayerProfile playerProfile, @NotNull WhitelistStatus status) {
++    public WhitelistStateUpdateEvent(final PlayerProfile playerProfile, final WhitelistStatus status) {
 +        this.playerProfile = playerProfile;
 +        this.status = status;
 +    }
@@ -44,7 +45,6 @@ index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73
 +     *
 +     * @return the player whose status is being changed
 +     */
-+    @NotNull
 +    public OfflinePlayer getPlayer() {
 +        return Bukkit.getOfflinePlayer(this.playerProfile.getId());
 +    }
@@ -54,7 +54,6 @@ index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73
 +     *
 +     * @return the player profile whose status is being changed
 +     */
-+    @NotNull
 +    public PlayerProfile getPlayerProfile() {
 +        return this.playerProfile;
 +    }
@@ -64,7 +63,6 @@ index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73
 +     *
 +     * @return the whitelist status
 +     */
-+    @NotNull
 +    public WhitelistStatus getStatus() {
 +        return this.status;
 +    }
@@ -75,17 +73,15 @@ index 0000000000000000000000000000000000000000..2f4273d694278517e2613f0da5e89c73
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0439-Add-ShulkerDuplicateEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add ShulkerDuplicateEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/entity/ShulkerDuplicateEvent.java b/src/main/java/io/papermc/paper/event/entity/ShulkerDuplicateEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4a59534e2
+index 0000000000000000000000000000000000000000..d427a67a5c7e44aee78d21a7b344b8bb19235dc7
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/entity/ShulkerDuplicateEvent.java
-@@ -0,0 +1,71 @@
+@@ -0,0 +1,68 @@
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.Shulker;
@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a shulker duplicates itself by spawning a new shulker.
 + * <p>
 + * The event is fired prior to the newly created shulker, accessible via {@link #getEntity()}, being added to the world.
 + */
++@NullMarked
 +public class ShulkerDuplicateEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,7 +33,7 @@ index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ShulkerDuplicateEvent(@NotNull Shulker child, @NotNull Shulker parent) {
++    public ShulkerDuplicateEvent(final Shulker child, final Shulker parent) {
 +        super(child);
 +        this.parent = parent;
 +    }
@@ -44,7 +45,6 @@ index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4
 +     * @return the newly duplicated shulker.
 +     */
 +    @Override
-+    @NotNull
 +    public Shulker getEntity() {
 +        return (Shulker) super.getEntity();
 +    }
@@ -55,7 +55,6 @@ index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4
 +     *
 +     * @return the previously existing shulker which duplicated.
 +     */
-+    @NotNull
 +    public Shulker getParent() {
 +        return this.parent;
 +    }
@@ -66,17 +65,15 @@ index 0000000000000000000000000000000000000000..88d8278e49f1bb32e97ee551d8ad31d4
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/0451-Add-BlockBreakProgressUpdateEvent.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Add BlockBreakProgressUpdateEvent
 
 diff --git a/src/main/java/io/papermc/paper/event/block/BlockBreakProgressUpdateEvent.java b/src/main/java/io/papermc/paper/event/block/BlockBreakProgressUpdateEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..0cd1ab085222eae1a8df8ad85b26b49b6dd93a09
+index 0000000000000000000000000000000000000000..1820e9b12141f3798dac499e19f8337c6f89d671
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/event/block/BlockBreakProgressUpdateEvent.java
-@@ -0,0 +1,56 @@
+@@ -0,0 +1,57 @@
 +package io.papermc.paper.event.block;
 +
 +import org.bukkit.block.Block;
@@ -17,20 +17,21 @@ index 0000000000000000000000000000000000000000..0cd1ab085222eae1a8df8ad85b26b49b
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Range;
 +
 +/**
 + * Called when the progress of a block break is updated.
 + */
++@NullMarked
 +public class BlockBreakProgressUpdateEvent extends BlockEvent {
++
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final float progress;
 +    private final Entity entity;
 +
 +    @ApiStatus.Internal
-+    public BlockBreakProgressUpdateEvent(@NotNull final Block block, final float progress, @NotNull final Entity entity) {
++    public BlockBreakProgressUpdateEvent(final Block block, final float progress, final Entity entity) {
 +        super(block);
 +        this.progress = progress;
 +        this.entity = entity;
@@ -45,7 +46,7 @@ index 0000000000000000000000000000000000000000..0cd1ab085222eae1a8df8ad85b26b49b
 +     * @return The progress of the block break
 +     */
 +    public float getProgress() {
-+        return progress;
++        return this.progress;
 +    }
 +
 +    /**
@@ -53,16 +54,16 @@ index 0000000000000000000000000000000000000000..0cd1ab085222eae1a8df8ad85b26b49b
 +     *
 +     * @return The entity breaking the block
 +     */
-+    @NotNull
 +    public Entity getEntity() {
-+        return entity;
++        return this.entity;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
-+    public static @NotNull HandlerList getHandlerList() {
++
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/0466-Brigadier-based-command-API.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Brigadier based command API
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 4da053d427f3f9c5e7fc144408836ebef80026c6..540fe7e2c110e79c3742f229b3ed8c54b101d260 100644
+index 37ff4cb89dfb28eab6f836840ff1838d67895c1e..2074c9aee1affbce57571398f8519f0d425cf5e3 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -27,6 +27,7 @@ configurations.api {
@@ -17,7 +17,7 @@ index 4da053d427f3f9c5e7fc144408836ebef80026c6..540fe7e2c110e79c3742f229b3ed8c54
      // api dependencies are listed transitively to API consumers
      api("com.google.guava:guava:32.1.2-jre")
      api("com.google.code.gson:gson:2.10.1")
-@@ -92,9 +93,29 @@ sourceSets {
+@@ -93,9 +94,29 @@ sourceSets {
      }
  }
  // Paper end
@@ -102,10 +102,10 @@ index 0000000000000000000000000000000000000000..28b44789e3be586c4b680fff56e5d2ff
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendCommandsEvent.java b/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendCommandsEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783ca9b4ffdf
+index 0000000000000000000000000000000000000000..18e0618901eb6eec7677661b8448cb95926ee3ab
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendCommandsEvent.java
-@@ -0,0 +1,73 @@
+@@ -0,0 +1,72 @@
 +package com.destroystokyo.paper.event.brigadier;
 +
 +import com.mojang.brigadier.tree.RootCommandNode;
@@ -115,7 +115,7 @@ index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783c
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time a Brigadier RootCommandNode is generated for a player to inform the client of commands.
@@ -138,6 +138,7 @@ index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783c
 + * <p>This is a draft/experimental API and is subject to change.</p>
 + */
 +@ApiStatus.Experimental
++@NullMarked
 +public class AsyncPlayerSendCommandsEvent<S extends CommandSourceStack> extends PlayerEvent {
 +
 +    private static final HandlerList handlers = new HandlerList();
@@ -145,7 +146,7 @@ index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783c
 +    private final boolean hasFiredAsync;
 +
 +    @ApiStatus.Internal
-+    public AsyncPlayerSendCommandsEvent(@NotNull Player player, @NotNull RootCommandNode<S> node, boolean hasFiredAsync) {
++    public AsyncPlayerSendCommandsEvent(final Player player, final RootCommandNode<S> node, final boolean hasFiredAsync) {
 +        super(player, !Bukkit.isPrimaryThread());
 +        this.node = node;
 +        this.hasFiredAsync = hasFiredAsync;
@@ -156,8 +157,8 @@ index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783c
 +     *
 +     * @return the root command node
 +     */
-+    public @NotNull RootCommandNode<S> getCommandNode() {
++    public RootCommandNode<S> getCommandNode() {
-+        return node;
++        return this.node;
 +    }
 +
 +    /**
@@ -166,25 +167,23 @@ index 0000000000000000000000000000000000000000..ba5472a068075f8f7fb5b9bce05e783c
 +     * @return whether this event has already fired asynchronously
 +     */
 +    public boolean hasFiredAsync() {
-+        return hasFiredAsync;
++        return this.hasFiredAsync;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return handlers;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return handlers;
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendSuggestionsEvent.java b/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendSuggestionsEvent.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d4375dd751c5
+index 0000000000000000000000000000000000000000..f2ed3af699c2df92227693830c135d0b4718d41f
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncPlayerSendSuggestionsEvent.java
-@@ -0,0 +1,85 @@
+@@ -0,0 +1,84 @@
 +package com.destroystokyo.paper.event.brigadier;
 +
 +import com.mojang.brigadier.suggestion.Suggestions;
@@ -194,13 +193,14 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when sending {@link Suggestions} to the client. Will be called asynchronously if a plugin
 + * marks the {@link com.destroystokyo.paper.event.server.AsyncTabCompleteEvent} event handled asynchronously,
 + * otherwise called synchronously.
 + */
++@NullMarked
 +public class AsyncPlayerSendSuggestionsEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList handlers = new HandlerList();
@@ -210,7 +210,7 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +    private final String buffer;
 +
 +    @ApiStatus.Internal
-+    public AsyncPlayerSendSuggestionsEvent(@NotNull Player player, @NotNull Suggestions suggestions, @NotNull String buffer) {
++    public AsyncPlayerSendSuggestionsEvent(final Player player, final Suggestions suggestions, final String buffer) {
 +        super(player, !Bukkit.isPrimaryThread());
 +        this.suggestions = suggestions;
 +        this.buffer = buffer;
@@ -221,8 +221,8 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +     *
 +     * @return the input buffer
 +     */
-+    public @NotNull String getBuffer() {
++    public String getBuffer() {
-+        return buffer;
++        return this.buffer;
 +    }
 +
 +    /**
@@ -230,8 +230,8 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +     *
 +     * @return the suggestions
 +     */
-+    public @NotNull Suggestions getSuggestions() {
++    public Suggestions getSuggestions() {
-+        return suggestions;
++        return this.suggestions;
 +    }
 +
 +    /**
@@ -239,7 +239,7 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +     *
 +     * @param suggestions suggestions
 +     */
-+    public void setSuggestions(@NotNull Suggestions suggestions) {
++    public void setSuggestions(final Suggestions suggestions) {
 +        this.suggestions = suggestions;
 +    }
 +
@@ -256,16 +256,14 @@ index 0000000000000000000000000000000000000000..6ac205de582983863bd5b3c0fa70d437
 +     * {@inheritDoc}
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return handlers;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return handlers;
 +    }