Fix Build

* Fix Firework not removed when FireworkExplodeEvent is canceled

* JUnit require pass null

* tweaks

.editorconfig

@@ -40,5 +40,5 @@ ij_java_use_fq_class_names = true
 [paper-server/src/minecraft/resources/data/**/*.json]
 indent_size = 2
 
-[paper-api-generator/generated/**/*.java]
+[paper-api/src/generated/java/**/*.java]
 ij_java_imports_layout = $*, |, *

CONTRIBUTING.md

@@ -208,7 +208,8 @@ required.
   with `// Paper end - <COMMIT DESCRIPTION>`.
 - One-line changes should have `// Paper - <COMMIT DESCRIPTION>` at the end of the line.
 
-> [!NOTE] These comments are incredibly important to be able to keep track of changes
+> [!NOTE]
+> These comments are incredibly important to be able to keep track of changes
 > across files and to remember what they are for, even a decade into the future.
 
 Here's an example of how to mark changes by Paper:
@@ -263,6 +264,40 @@ are assumed to be non-null by default. For less obvious placing such as on gener
 **For other classes**: Keep using both `@Nullable` and `@NotNull` from `org.jetbrains.annotations`. These
 will be replaced later.
 
+### API checks
+
+When performing API-related checks where an exception needs to be thrown under specific conditions, you should use the `Preconditions` class.
+
+#### Checking Method Arguments
+To validate method arguments, use `Preconditions#checkArgument`. This will throw an `IllegalArgumentException` if the condition is not met.
+> Don't use Preconditions#checkNotNull, as it throws a NullPointerException, which makes it harder to determine whether the error was caused by an internal issue or invalid arguments.
+
+ex:
+```java
+@Override
+public void sendMessage(Player player, Component message) {
+    Preconditions.checkArgument(player != null, "player cannot be null");
+    Preconditions.checkArgument(player.isOnline(), "player %s must be online", player.getName());
+    Preconditions.checkArgument(message != null, "message cannot be null");
+    // rest of code
+}
+```
+
+#### Checking Object State
+To validate the state of an object inside a method, use `Preconditions#checkState`. This will throw an `IllegalStateException` if the condition is not met.
+ex:
+```java
+private Player player;
+
+@Override
+public void sendMessage(Component message) {
+    Preconditions.checkArgument(message != null, "message cannot be null");
+    Preconditions.checkState(this.player != null, "player cannot be null");
+    Preconditions.checkState(this.player.isOnline(), "player %s must be online", this.player.getName());
+    // rest of code
+}
+```
+
 ## Access Transformers
 Sometimes, Vanilla code already contains a field, method, or type you want to access
 but the visibility is too low (e.g. a private field in an entity class). Paper can use access transformers

build-data/paper.at

@@ -186,6 +186,7 @@ public net.minecraft.world.entity.Entity getEncodeId()Ljava/lang/String;
 public net.minecraft.world.entity.Entity getFireImmuneTicks()I
 public net.minecraft.world.entity.Entity getSharedFlag(I)Z
 public net.minecraft.world.entity.Entity hasVisualFire
+public net.minecraft.world.entity.Entity isAffectedByBlocks()Z
 public net.minecraft.world.entity.Entity isInBubbleColumn()Z
 public net.minecraft.world.entity.Entity isInRain()Z
 public net.minecraft.world.entity.Entity isInvulnerableToBase(Lnet/minecraft/world/damagesource/DamageSource;)Z
@@ -196,6 +197,7 @@ public net.minecraft.world.entity.Entity random
 public net.minecraft.world.entity.Entity setLevel(Lnet/minecraft/world/level/Level;)V
 public net.minecraft.world.entity.Entity setRot(FF)V
 public net.minecraft.world.entity.Entity setSharedFlag(IZ)V
+public net.minecraft.world.entity.Entity teleportPassengers()V
 public net.minecraft.world.entity.Entity unsetRemoved()V
 public net.minecraft.world.entity.Entity wasTouchingWater
 public net.minecraft.world.entity.ExperienceOrb count
@@ -490,6 +492,7 @@ public net.minecraft.world.inventory.BrewingStandMenu brewingStandData
 public net.minecraft.world.inventory.CraftingMenu access
 public net.minecraft.world.inventory.DispenserMenu dispenser
 public net.minecraft.world.inventory.HorseInventoryMenu SLOT_BODY_ARMOR
+public net.minecraft.world.inventory.HorseInventoryMenu horse
 public net.minecraft.world.inventory.MerchantContainer selectionHint
 public net.minecraft.world.inventory.Slot slot
 public net.minecraft.world.item.AdventureModePredicate predicates
@@ -503,6 +506,7 @@ public net.minecraft.world.item.ItemStackLinkedSet TYPE_AND_TAG
 public net.minecraft.world.item.JukeboxSongPlayer song
 public net.minecraft.world.item.MapItem createNewSavedData(Lnet/minecraft/world/level/Level;IIIZZLnet/minecraft/resources/ResourceKey;)Lnet/minecraft/world/level/saveddata/maps/MapId;
 public net.minecraft.world.item.StandingAndWallBlockItem wallBlock
+public net.minecraft.world.item.component.BundleContents$Mutable getMaxAmountToAdd(Lnet/minecraft/world/item/ItemStack;)I
 public net.minecraft.world.item.component.ItemContainerContents MAX_SIZE
 public net.minecraft.world.item.component.ItemContainerContents items
 public net.minecraft.world.item.context.UseOnContext <init>(Lnet/minecraft/world/level/Level;Lnet/minecraft/world/entity/player/Player;Lnet/minecraft/world/InteractionHand;Lnet/minecraft/world/item/ItemStack;Lnet/minecraft/world/phys/BlockHitResult;)V
@@ -602,6 +606,7 @@ public net.minecraft.world.level.block.entity.SculkSensorBlockEntity lastVibrati
 public net.minecraft.world.level.block.entity.SculkShriekerBlockEntity warningLevel
 public net.minecraft.world.level.block.entity.ShulkerBoxBlockEntity openCount
 public net.minecraft.world.level.block.entity.SignBlockEntity playerWhoMayEdit
+public net.minecraft.world.level.block.entity.SkullBlockEntity customName
 public net.minecraft.world.level.block.entity.SkullBlockEntity noteBlockSound
 public net.minecraft.world.level.block.entity.SkullBlockEntity owner
 public net.minecraft.world.level.block.entity.StructureBlockEntity author
@@ -622,9 +627,16 @@ public net.minecraft.world.level.block.entity.TheEndGatewayBlockEntity exitPorta
 public net.minecraft.world.level.block.entity.TrialSpawnerBlockEntity trialSpawner
 public net.minecraft.world.level.block.entity.trialspawner.TrialSpawner isOminous
 public net.minecraft.world.level.block.entity.trialspawner.TrialSpawner stateAccessor
+public net.minecraft.world.level.block.entity.trialspawner.TrialSpawnerData cooldownEndsAt
 public net.minecraft.world.level.block.entity.trialspawner.TrialSpawnerData currentMobs
 public net.minecraft.world.level.block.entity.trialspawner.TrialSpawnerData detectedPlayers
+public net.minecraft.world.level.block.entity.trialspawner.TrialSpawnerData nextMobSpawnsAt
 public net.minecraft.world.level.block.entity.trialspawner.TrialSpawnerData nextSpawnData
+public net.minecraft.world.level.block.entity.vault.VaultBlockEntity serverData
+public net.minecraft.world.level.block.entity.vault.VaultServerData getRewardedPlayers()Ljava/util/Set;
+public net.minecraft.world.level.block.entity.vault.VaultServerData pauseStateUpdatingUntil(J)V
+public net.minecraft.world.level.block.entity.vault.VaultServerData stateUpdatingResumesAt()J
+public net.minecraft.world.level.block.entity.vault.VaultSharedData getConnectedPlayers()Ljava/util/Set;
 public net.minecraft.world.level.block.state.BlockBehaviour getMenuProvider(Lnet/minecraft/world/level/block/state/BlockState;Lnet/minecraft/world/level/Level;Lnet/minecraft/core/BlockPos;)Lnet/minecraft/world/MenuProvider;
 public net.minecraft.world.level.block.state.BlockBehaviour hasCollision
 public net.minecraft.world.level.block.state.BlockBehaviour$BlockStateBase destroySpeed
@@ -723,6 +735,7 @@ public-f net.minecraft.world.item.trading.MerchantOffer rewardExp
 public-f net.minecraft.world.item.trading.MerchantOffer xp
 public-f net.minecraft.world.level.LevelSettings hardcore
 public-f net.minecraft.world.level.LevelSettings levelName
+public-f net.minecraft.world.level.block.ChestBlock MENU_PROVIDER_COMBINER
 public-f net.minecraft.world.level.block.entity.BannerBlockEntity baseColor
 public-f net.minecraft.world.level.block.entity.trialspawner.TrialSpawner normalConfig
 public-f net.minecraft.world.level.block.entity.trialspawner.TrialSpawner ominousConfig

build.gradle.kts

@@ -12,7 +12,7 @@ import java.nio.file.Path
 import kotlin.random.Random
 
 plugins {
-    id("io.papermc.paperweight.core") version "2.0.0-beta.10" apply false
+    id("io.papermc.paperweight.core") version "2.0.0-beta.14" apply false
 }
 
 subprojects {
@@ -38,6 +38,7 @@ subprojects {
         options.encoding = Charsets.UTF_8.name()
         options.release = 21
         options.isFork = true
+        options.compilerArgs.addAll(listOf("-Xlint:-deprecation", "-Xlint:-removal"))
     }
     tasks.withType<Javadoc> {
         options.encoding = Charsets.UTF_8.name()

paper-api-generator/build.gradle.kts

@@ -25,7 +25,7 @@ tasks.register<JavaExec>("generate") {
     dependsOn(tasks.check)
     mainClass.set("io.papermc.generator.Main")
     classpath(sourceSets.main.map { it.runtimeClasspath })
-    args(projectDir.toPath().resolve("generated").toString())
+    args(rootProject.layout.projectDirectory.dir("paper-api/src/generated/java").asFile.absolutePath)
     javaLauncher = javaToolchains.defaultJavaLauncher(project)
 }
 

paper-api-generator/src/main/java/io/papermc/generator/types/GeneratedKeyType.java

@@ -101,7 +101,6 @@ public class GeneratedKeyType<T, A> extends SimpleGenerator {
             .addCode("return $T.create($T.$L, $N);", TypedKey.class, RegistryKey.class, requireNonNull(REGISTRY_KEY_FIELD_NAMES.get(this.apiRegistryKey), "Missing field for " + this.apiRegistryKey), keyParam)
             .returns(returnType);
         if (this.publicCreateKeyMethod) {
-            create.addAnnotation(EXPERIMENTAL_API_ANNOTATION); // TODO remove once not experimental
             create.addJavadoc(CREATE_JAVADOC, this.apiType, this.registryKey.location().toString());
         }
         return create;
@@ -157,8 +156,6 @@ public class GeneratedKeyType<T, A> extends SimpleGenerator {
         if (allExperimental) {
             typeBuilder.addAnnotations(experimentalAnnotations(null)); // Update for Experimental API
             createMethod.addAnnotations(experimentalAnnotations(null)); // Update for Experimental API
-        } else {
-            typeBuilder.addAnnotation(EXPERIMENTAL_API_ANNOTATION); // TODO experimental API
         }
         return typeBuilder.addMethod(createMethod.build()).build();
     }

paper-api/build.gradle.kts

@@ -93,7 +93,7 @@ dependencies {
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 
-val generatedApiPath: java.nio.file.Path = rootProject.projectDir.toPath().resolve("paper-api-generator/generated")
+val generatedApiPath: java.nio.file.Path = layout.projectDirectory.dir("src/generated/java").asFile.toPath()
 idea {
     module {
         generatedSourceDirs.add(generatedApiPath.toFile())
@@ -176,7 +176,7 @@ tasks.withType<Javadoc> {
         "https://guava.dev/releases/33.3.1-jre/api/docs/",
         "https://javadoc.io/doc/org.yaml/snakeyaml/2.2/",
         "https://javadoc.io/doc/org.jetbrains/annotations/$annotationsVersion/",
-        "https://javadoc.io/doc/org.joml/joml/1.10.8/index.html",
+        "https://javadoc.io/doc/org.joml/joml/1.10.8/",
         "https://www.javadoc.io/doc/com.google.code.gson/gson/2.11.0",
         "https://jspecify.dev/docs/api/",
         "https://jd.advntr.dev/api/$adventureVersion/",

paper-api/src/generated/java/io/papermc/paper/registry/keys/AttributeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.attribute.Attribute;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class AttributeKeys {
     /**
      * {@code minecraft:armor}

paper-api/src/generated/java/io/papermc/paper/registry/keys/BannerPatternKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.block.banner.PatternType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class BannerPatternKeys {
     /**
      * {@code minecraft:base}
@@ -337,7 +335,6 @@ public final class BannerPatternKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<PatternType> create(final Key key) {
         return TypedKey.create(RegistryKey.BANNER_PATTERN, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/BiomeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.block.Biome;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class BiomeKeys {
     /**
      * {@code minecraft:badlands}
@@ -491,7 +489,6 @@ public final class BiomeKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<Biome> create(final Key key) {
         return TypedKey.create(RegistryKey.BIOME, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/BlockTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.block.BlockType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class BlockTypeKeys {
     /**
      * {@code minecraft:acacia_button}

paper-api/src/generated/java/io/papermc/paper/registry/keys/CatVariantKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.entity.Cat;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class CatVariantKeys {
     /**
      * {@code minecraft:all_black}

paper-api/src/generated/java/io/papermc/paper/registry/keys/DamageTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.damage.DamageType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class DamageTypeKeys {
     /**
      * {@code minecraft:arrow}
@@ -379,7 +377,6 @@ public final class DamageTypeKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<DamageType> create(final Key key) {
         return TypedKey.create(RegistryKey.DAMAGE_TYPE, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/EnchantmentKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.enchantments.Enchantment;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class EnchantmentKeys {
     /**
      * {@code minecraft:aqua_affinity}
@@ -330,7 +328,6 @@ public final class EnchantmentKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<Enchantment> create(final Key key) {
         return TypedKey.create(RegistryKey.ENCHANTMENT, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/FluidKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.Fluid;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class FluidKeys {
     /**
      * {@code minecraft:empty}

paper-api/src/generated/java/io/papermc/paper/registry/keys/FrogVariantKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.entity.Frog;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class FrogVariantKeys {
     /**
      * {@code minecraft:cold}

paper-api/src/generated/java/io/papermc/paper/registry/keys/GameEventKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.GameEvent;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class GameEventKeys {
     /**
      * {@code minecraft:block_activate}
@@ -456,7 +454,6 @@ public final class GameEventKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<GameEvent> create(final Key key) {
         return TypedKey.create(RegistryKey.GAME_EVENT, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/InstrumentKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.MusicInstrument;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class InstrumentKeys {
     /**
      * {@code minecraft:admire_goat_horn}
@@ -92,7 +90,6 @@ public final class InstrumentKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<MusicInstrument> create(final Key key) {
         return TypedKey.create(RegistryKey.INSTRUMENT, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/ItemTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.inventory.ItemType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class ItemTypeKeys {
     /**
      * {@code minecraft:acacia_boat}

paper-api/src/generated/java/io/papermc/paper/registry/keys/JukeboxSongKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.JukeboxSong;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class JukeboxSongKeys {
     /**
      * {@code minecraft:11}
@@ -169,7 +167,6 @@ public final class JukeboxSongKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<JukeboxSong> create(final Key key) {
         return TypedKey.create(RegistryKey.JUKEBOX_SONG, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/MapDecorationTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.map.MapCursor;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class MapDecorationTypeKeys {
     /**
      * {@code minecraft:banner_black}

paper-api/src/generated/java/io/papermc/paper/registry/keys/MenuTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.inventory.MenuType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class MenuTypeKeys {
     /**
      * {@code minecraft:anvil}

paper-api/src/generated/java/io/papermc/paper/registry/keys/MobEffectKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.potion.PotionEffectType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class MobEffectKeys {
     /**
      * {@code minecraft:absorption}

paper-api/src/generated/java/io/papermc/paper/registry/keys/PaintingVariantKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.Art;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class PaintingVariantKeys {
     /**
      * {@code minecraft:alban}
@@ -386,7 +384,6 @@ public final class PaintingVariantKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<Art> create(final Key key) {
         return TypedKey.create(RegistryKey.PAINTING_VARIANT, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/SoundEventKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.Sound;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class SoundEventKeys {
     /**
      * {@code minecraft:ambient.basalt_deltas.additions}

paper-api/src/generated/java/io/papermc/paper/registry/keys/StructureKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.generator.structure.Structure;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class StructureKeys {
     /**
      * {@code minecraft:ancient_city}
@@ -274,7 +272,6 @@ public final class StructureKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<Structure> create(final Key key) {
         return TypedKey.create(RegistryKey.STRUCTURE, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/StructureTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.generator.structure.StructureType;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class StructureTypeKeys {
     /**
      * {@code minecraft:buried_treasure}

paper-api/src/generated/java/io/papermc/paper/registry/keys/TrimMaterialKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.inventory.meta.trim.TrimMaterial;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class TrimMaterialKeys {
     /**
      * {@code minecraft:amethyst}
@@ -113,7 +111,6 @@ public final class TrimMaterialKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<TrimMaterial> create(final Key key) {
         return TypedKey.create(RegistryKey.TRIM_MATERIAL, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/TrimPatternKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.inventory.meta.trim.TrimPattern;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class TrimPatternKeys {
     /**
      * {@code minecraft:bolt}
@@ -162,7 +160,6 @@ public final class TrimPatternKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<TrimPattern> create(final Key key) {
         return TypedKey.create(RegistryKey.TRIM_PATTERN, key);
     }

paper-api/src/generated/java/io/papermc/paper/registry/keys/VillagerProfessionKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.entity.Villager;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class VillagerProfessionKeys {
     /**
      * {@code minecraft:armorer}

paper-api/src/generated/java/io/papermc/paper/registry/keys/VillagerTypeKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.entity.Villager;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class VillagerTypeKeys {
     /**
      * {@code minecraft:desert}

paper-api/src/generated/java/io/papermc/paper/registry/keys/WolfVariantKeys.java

@@ -7,7 +7,6 @@ import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
 import org.bukkit.entity.Wolf;
-import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
@@ -25,7 +24,6 @@ import org.jspecify.annotations.NullMarked;
 })
 @GeneratedFrom("1.21.4")
 @NullMarked
-@ApiStatus.Experimental
 public final class WolfVariantKeys {
     /**
      * {@code minecraft:ashen}
@@ -99,7 +97,6 @@ public final class WolfVariantKeys {
      * @param key the value's key in the registry
      * @return a new typed key
      */
-    @ApiStatus.Experimental
     public static TypedKey<Wolf.Variant> create(final Key key) {
         return TypedKey.create(RegistryKey.WOLF_VARIANT, key);
     }

paper-api/src/main/java/com/destroystokyo/paper/NamespacedTag.java

@@ -5,6 +5,7 @@ import java.util.Locale;
 import java.util.UUID;
 import java.util.regex.Pattern;
 import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
 /**
@@ -126,6 +127,7 @@ public final class NamespacedTag implements com.destroystokyo.paper.Namespaced {
      * @deprecated should never be used by plugins, for internal use only!!
      */
     @Deprecated
+    @ApiStatus.Internal
     public static NamespacedTag randomKey() {
         return new NamespacedTag(BUKKIT, UUID.randomUUID().toString());
     }

paper-api/src/main/java/com/destroystokyo/paper/event/entity/SkeletonHorseTrapEvent.java

@@ -1,6 +1,5 @@
 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;
@@ -21,12 +20,6 @@ public class SkeletonHorseTrapEvent extends EntityEvent implements Cancellable {
     private final List<HumanEntity> eligibleHumans;
     private boolean cancelled;
 
-    @Deprecated
-    @ApiStatus.Internal
-    public SkeletonHorseTrapEvent(final SkeletonHorse horse) {
-        this(horse, ImmutableList.of());
-    }
-
     @ApiStatus.Internal
     public SkeletonHorseTrapEvent(final SkeletonHorse horse, final List<HumanEntity> eligibleHumans) {
         super(horse);

paper-api/src/main/java/com/destroystokyo/paper/event/player/IllegalPacketEvent.java

@@ -10,7 +10,7 @@ import org.jetbrains.annotations.Nullable;
 /**
  * @deprecated Not used
  */
-@Deprecated(since = "1.16.4")
+@Deprecated(since = "1.16.4", forRemoval = true)
 public class IllegalPacketEvent extends PlayerEvent {
 
     private static final HandlerList HANDLER_LIST = new HandlerList();

paper-api/src/main/java/com/destroystokyo/paper/event/player/PlayerArmorChangeEvent.java

@@ -5,6 +5,7 @@ import org.bukkit.Material;
 import org.bukkit.entity.Player;
 import org.bukkit.event.HandlerList;
 import org.bukkit.event.player.PlayerEvent;
+import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
@@ -16,8 +17,10 @@ import static org.bukkit.Material.*;
  * Called when the player themselves change their armor items
  * <p>
  * Not currently called for environmental factors though it <strong>MAY BE IN THE FUTURE</strong>
+ * @apiNote Use {@link io.papermc.paper.event.entity.EntityEquipmentChangedEvent} for all entity equipment changes
  */
 @NullMarked
+@ApiStatus.Obsolete(since = "1.21.4")
 public class PlayerArmorChangeEvent extends PlayerEvent {
 
     private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -38,11 +41,27 @@ public class PlayerArmorChangeEvent extends PlayerEvent {
      * Gets the type of slot being altered.
      *
      * @return type of slot being altered
+     * @deprecated {@link SlotType} does not accurately represent what item types are valid in each slot. Use {@link #getSlot()} instead.
      */
+    @Deprecated(since = "1.21.4")
     public SlotType getSlotType() {
         return this.slotType;
     }
 
+    /**
+     * Gets the slot being altered.
+     *
+     * @return slot being altered
+     */
+    public EquipmentSlot getSlot() {
+        return switch (this.slotType) {
+            case HEAD -> EquipmentSlot.HEAD;
+            case CHEST -> EquipmentSlot.CHEST;
+            case LEGS -> EquipmentSlot.LEGS;
+            case FEET -> EquipmentSlot.FEET;
+        };
+    }
+
     /**
      * Gets the existing item that's being replaced
      *
@@ -70,6 +89,10 @@ public class PlayerArmorChangeEvent extends PlayerEvent {
         return HANDLER_LIST;
     }
 
+    /**
+     * @deprecated {@link SlotType} does not accurately represent what item types are valid in each slot.
+     */
+    @Deprecated(since = "1.21.4")
     public enum SlotType {
         HEAD(NETHERITE_HELMET, DIAMOND_HELMET, GOLDEN_HELMET, IRON_HELMET, CHAINMAIL_HELMET, LEATHER_HELMET, CARVED_PUMPKIN, PLAYER_HEAD, SKELETON_SKULL, ZOMBIE_HEAD, CREEPER_HEAD, WITHER_SKELETON_SKULL, TURTLE_HELMET, DRAGON_HEAD, PIGLIN_HEAD),
         CHEST(NETHERITE_CHESTPLATE, DIAMOND_CHESTPLATE, GOLDEN_CHESTPLATE, IRON_CHESTPLATE, CHAINMAIL_CHESTPLATE, LEATHER_CHESTPLATE, ELYTRA),

paper-api/src/main/java/com/destroystokyo/paper/event/player/PlayerClientOptionsChangeEvent.java

@@ -30,20 +30,6 @@ public class PlayerClientOptionsChangeEvent extends PlayerEvent {
     private final boolean textFilteringEnabled;
     private final ParticleVisibility particleVisibility;
 
-    @Deprecated
-    public PlayerClientOptionsChangeEvent(final Player player, final String locale, final int viewDistance, final ChatVisibility chatVisibility, final boolean chatColors, final SkinParts skinParts, final MainHand mainHand) {
-        super(player);
-        this.locale = locale;
-        this.viewDistance = viewDistance;
-        this.chatVisibility = chatVisibility;
-        this.chatColors = chatColors;
-        this.skinparts = skinParts;
-        this.mainHand = mainHand;
-        this.allowsServerListings = false;
-        this.textFilteringEnabled = false;
-        this.particleVisibility = ParticleVisibility.ALL;
-    }
-
     @ApiStatus.Internal
     public PlayerClientOptionsChangeEvent(final Player player, final Map<ClientOption<?>, ?> options) {
         super(player);

paper-api/src/main/java/com/destroystokyo/paper/event/player/PlayerUseUnknownEntityEvent.java

@@ -11,7 +11,7 @@ import org.jspecify.annotations.NullMarked;
 import org.jspecify.annotations.Nullable;
 
 /**
- * Represents an event that is called when a player right-clicks an unknown entity.
+ * Represents an event that is called when a player clicks an unknown entity.
  * Useful for plugins dealing with virtual entities (entities that aren't actually spawned on the server).
  * <br>
  * This event may be called multiple times per interaction with different interaction hands

paper-api/src/main/java/com/destroystokyo/paper/event/profile/ProfileWhitelistVerifyEvent.java

@@ -50,12 +50,6 @@ public class ProfileWhitelistVerifyEvent extends Event {
     private boolean whitelisted;
     private @Nullable Component kickMessage;
 
-    @Deprecated
-    @ApiStatus.Internal
-    public ProfileWhitelistVerifyEvent(final PlayerProfile profile, final boolean whitelistEnabled, final boolean whitelisted, final boolean isOp, final @Nullable String kickMessage) {
-        this(profile, whitelistEnabled, whitelisted, isOp, kickMessage == null ? null : LegacyComponentSerializer.legacySection().deserialize(kickMessage));
-    }
-
     @ApiStatus.Internal
     public ProfileWhitelistVerifyEvent(final PlayerProfile profile, final boolean whitelistEnabled, final boolean whitelisted, final boolean isOp, final @Nullable Component kickMessage) {
         this.profile = profile;

paper-api/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java

@@ -55,18 +55,6 @@ public class PaperServerListPingEvent extends ServerListPingEvent implements Can
     private boolean originalPlayerCount = true;
     private Object[] players;
 
-    @Deprecated
-    @ApiStatus.Internal
-    public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull String motd, int numPlayers, int maxPlayers,
-            @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {
-        super("", client.getAddress().getAddress(), motd, numPlayers, maxPlayers);
-        this.client = client;
-        this.numPlayers = numPlayers;
-        this.version = version;
-        this.protocolVersion = protocolVersion;
-        setServerIcon(favicon);
-    }
-
     @ApiStatus.Internal
     public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull net.kyori.adventure.text.Component motd, int numPlayers, int maxPlayers,
                                     @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {

paper-api/src/main/java/io/papermc/paper/command/brigadier/CommandRegistrationFlag.java

@@ -10,5 +10,10 @@ import org.jetbrains.annotations.ApiStatus;
  */
 @ApiStatus.Internal
 public enum CommandRegistrationFlag {
+
+    /**
+     * @deprecated This is the default behavior now.
+     */
+    @Deprecated(since = "1.21.4")
     FLATTEN_ALIASES
 }

paper-api/src/main/java/io/papermc/paper/command/brigadier/CommandSourceStack.java

@@ -1,5 +1,7 @@
 package io.papermc.paper.command.brigadier;
 
+import com.mojang.brigadier.RedirectModifier;
+import com.mojang.brigadier.tree.CommandNode;
 import org.bukkit.Location;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Entity;
@@ -48,4 +50,24 @@ public interface CommandSourceStack {
      * @return entity that executes this command
      */
     @Nullable Entity getExecutor();
+
+    /**
+     * Creates a new CommandSourceStack object with a different location for redirecting commands to other nodes.
+     *
+     * @param location The location to create a new CommandSourceStack object with
+     * @return The newly created CommandSourceStack
+     * @see #getLocation()
+     * @see com.mojang.brigadier.builder.ArgumentBuilder#fork(CommandNode, RedirectModifier)
+     */
+    CommandSourceStack withLocation(Location location);
+
+    /**
+     * Creates a new CommandSourceStack object with a different executor for redirecting commands to other nodes.
+     *
+     * @param executor The executing entity to create a new CommandSourceStack object with
+     * @return The newly created CommandSourceStack
+     * @see #getExecutor()
+     * @see com.mojang.brigadier.builder.ArgumentBuilder#fork(CommandNode, RedirectModifier)
+     */
+    CommandSourceStack withExecutor(Entity executor);
 }

paper-api/src/main/java/io/papermc/paper/command/brigadier/Commands.java

@@ -113,6 +113,7 @@ public interface Commands extends Registrar {
      * <p>Commands have certain overriding behavior:
      * <ul>
      *   <li>Aliases will not override already existing commands (excluding namespaced ones)</li>
+     *   <li>Aliases are <b>not</b> Brigadier redirects, they just copy the command to a different label</li>
      *   <li>The main command/namespaced label will override already existing commands</li>
      * </ul>
      *
@@ -129,6 +130,7 @@ public interface Commands extends Registrar {
      * <p>Commands have certain overriding behavior:
      * <ul>
      *   <li>Aliases will not override already existing commands (excluding namespaced ones)</li>
+     *   <li>Aliases are <b>not</b> Brigadier redirects, they just copy the command to a different label</li>
      *   <li>The main command/namespaced label will override already existing commands</li>
      * </ul>
      *
@@ -146,6 +148,7 @@ public interface Commands extends Registrar {
      * <p>Commands have certain overriding behavior:
      * <ul>
      *   <li>Aliases will not override already existing commands (excluding namespaced ones)</li>
+     *   <li>Aliases are <b>not</b> Brigadier redirects, they just copy the command to a different label</li>
      *   <li>The main command/namespaced label will override already existing commands</li>
      * </ul>
      *
@@ -163,6 +166,7 @@ public interface Commands extends Registrar {
      * <p>Commands have certain overriding behavior:
      * <ul>
      *   <li>Aliases will not override already existing commands (excluding namespaced ones)</li>
+     *   <li>Aliases are <b>not</b> Brigadier redirects, they just copy the command to a different label</li>
      *   <li>The main command/namespaced label will override already existing commands</li>
      * </ul>
      *
@@ -179,6 +183,7 @@ public interface Commands extends Registrar {
      * <p>Commands have certain overriding behavior:
      * <ul>
      *   <li>Aliases will not override already existing commands (excluding namespaced ones)</li>
+     *   <li>Aliases are <b>not</b> Brigadier redirects, they just copy the command to a different label</li>
      *   <li>The main command/namespaced label will override already existing commands</li>
      * </ul>
      *

paper-api/src/main/java/io/papermc/paper/command/brigadier/argument/ArgumentTypes.java

@@ -7,6 +7,7 @@ import io.papermc.paper.command.brigadier.argument.range.IntegerRangeProvider;
 import io.papermc.paper.command.brigadier.argument.resolvers.BlockPositionResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.FinePositionResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.PlayerProfileListResolver;
+import io.papermc.paper.command.brigadier.argument.resolvers.RotationResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.selector.EntitySelectorArgumentResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.selector.PlayerSelectorArgumentResolver;
 import io.papermc.paper.entity.LookAnchor;
@@ -123,6 +124,15 @@ public final class ArgumentTypes {
         return provider().finePosition(centerIntegers);
     }
 
+    /**
+     * A rotation argument.
+     *
+     * @return rotation argument
+     */
+    public static ArgumentType<RotationResolver> rotation() {
+        return provider().rotation();
+    }
+
     /**
      * A blockstate argument which will provide rich parsing for specifying
      * the specific block variant and then the block entity NBT if applicable.

paper-api/src/main/java/io/papermc/paper/command/brigadier/argument/VanillaArgumentProvider.java

@@ -7,6 +7,7 @@ import io.papermc.paper.command.brigadier.argument.range.IntegerRangeProvider;
 import io.papermc.paper.command.brigadier.argument.resolvers.BlockPositionResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.FinePositionResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.PlayerProfileListResolver;
+import io.papermc.paper.command.brigadier.argument.resolvers.RotationResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.selector.EntitySelectorArgumentResolver;
 import io.papermc.paper.command.brigadier.argument.resolvers.selector.PlayerSelectorArgumentResolver;
 import io.papermc.paper.entity.LookAnchor;
@@ -57,6 +58,8 @@ interface VanillaArgumentProvider {
 
     ArgumentType<FinePositionResolver> finePosition(boolean centerIntegers);
 
+    ArgumentType<RotationResolver> rotation();
+
     ArgumentType<BlockState> blockState();
 
     ArgumentType<ItemStack> itemStack();

paper-api/src/main/java/io/papermc/paper/command/brigadier/argument/resolvers/RotationResolver.java

@@ -0,0 +1,16 @@
+package io.papermc.paper.command.brigadier.argument.resolvers;
+
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import io.papermc.paper.math.Rotation;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * An {@link ArgumentResolver} that's capable of resolving
+ * a rotation argument value using a {@link CommandSourceStack}.
+ *
+ * @see io.papermc.paper.command.brigadier.argument.ArgumentTypes#rotation()
+ */
+@ApiStatus.Experimental
+@ApiStatus.NonExtendable
+public interface RotationResolver extends ArgumentResolver<Rotation> {
+}

paper-api/src/main/java/io/papermc/paper/datacomponent/item/DamageResistant.java

@@ -21,9 +21,9 @@ public interface DamageResistant {
     }
 
     /**
-     * The types that this damage type is invincible tp.
+     * The types that this damage type is invincible to.
      *
-     * @return item
+     * @return the key of the tag holding the respective damage types.
      */
     @Contract(value = "-> new", pure = true)
     TagKey<DamageType> types();

paper-api/src/main/java/io/papermc/paper/datacomponent/item/consumable/ConsumeEffect.java

@@ -21,7 +21,7 @@ public interface ConsumeEffect {
      * Creates a consume effect that randomly teleports the entity on consumption.
      *
      * @param diameter diameter of random teleportation
-     * @return the effect
+     * @return the effect instance
      */
     @Contract(value = "_ -> new", pure = true)
     static TeleportRandomly teleportRandomlyEffect(final float diameter) {
@@ -29,21 +29,21 @@ public interface ConsumeEffect {
     }
 
     /**
-     * Creates a consume effect that gives status effects on consumption.
+     * Creates a consume effect that removes status effects on consumption.
      *
-     * @param key the sound effect to play
-     * @return the effect
+     * @param effects the potion effects to remove
+     * @return the effect instance
      */
     @Contract(value = "_ -> new", pure = true)
-    static RemoveStatusEffects removeEffects(final RegistryKeySet<PotionEffectType> key) {
-        return ConsumableTypesBridge.bridge().removeStatusEffects(key);
+    static RemoveStatusEffects removeEffects(final RegistryKeySet<PotionEffectType> effects) {
+        return ConsumableTypesBridge.bridge().removeStatusEffects(effects);
     }
 
     /**
      * Creates a consume effect that plays a sound on consumption.
      *
-     * @param key the sound effect to play
-     * @return the effect
+     * @param key the key sound effect to play
+     * @return the effect instance
      */
     @Contract(value = "_ -> new", pure = true)
     static PlaySound playSoundConsumeEffect(final Key key) {
@@ -53,7 +53,7 @@ public interface ConsumeEffect {
     /**
      * Creates a consume effect that clears all status effects.
      *
-     * @return effect instance
+     * @return the effect instance
      */
     @Contract(value = "-> new", pure = true)
     static ClearAllStatusEffects clearAllStatusEffects() {
@@ -61,17 +61,20 @@ public interface ConsumeEffect {
     }
 
     /**
-     * Creates a consume effect that gives status effects on consumption.
+     * Creates a consume effect that gives potion effects on consumption.
      *
      * @param effects     the potion effects to apply
-     * @param probability the probability of these effects being applied, between 0 and 1 inclusive.
-     * @return the effect
+     * @param probability the probability of these effects being applied, between 0 and 1 inclusive
+     * @return the effect instance
      */
     @Contract(value = "_, _ -> new", pure = true)
     static ApplyStatusEffects applyStatusEffects(final List<PotionEffect> effects, final float probability) {
         return ConsumableTypesBridge.bridge().applyStatusEffects(effects, probability);
     }
 
+    /**
+     * Represents a consumable effect that randomly teleports the entity on consumption.
+     */
     @ApiStatus.Experimental
     @ApiStatus.NonExtendable
     interface TeleportRandomly extends ConsumeEffect {
@@ -85,14 +88,14 @@ public interface ConsumeEffect {
     }
 
     /**
-     * Represents a consumable effect that removes status effects on consumption
+     * Represents a consumable effect that removes status effects on consumption.
      */
     @ApiStatus.Experimental
     @ApiStatus.NonExtendable
     interface RemoveStatusEffects extends ConsumeEffect {
 
         /**
-         * Potion effects to remove
+         * Potion effects to remove.
          *
          * @return effects
          */
@@ -107,7 +110,7 @@ public interface ConsumeEffect {
     interface PlaySound extends ConsumeEffect {
 
         /**
-         * Sound effect to play in the world
+         * Sound effect to play in the world.
          *
          * @return sound effect
          */
@@ -124,16 +127,16 @@ public interface ConsumeEffect {
     }
 
     /**
-     * Represents a consumable effect that applies effects based on a probability on consumption.
+     * Represents a consumable effect that applies potion effects based on a probability on consumption.
      */
     @ApiStatus.Experimental
     @ApiStatus.NonExtendable
     interface ApplyStatusEffects extends ConsumeEffect {
 
         /**
-         * Effect instances to grant
+         * Potion effect instances to grant.
          *
-         * @return effect
+         * @return potion effects
          */
         List<PotionEffect> effects();
 

paper-api/src/main/java/io/papermc/paper/datapack/DatapackRegistrar.java

@@ -19,11 +19,13 @@ import org.jspecify.annotations.Nullable;
  * is called anytime the game tries to discover datapacks at any of the
  * configured locations. This means that if a datapack should stay available to the server,
  * it must always be discovered whenever this event fires.
- * <p>An example of a plugin loading a datapack from within it's own jar is below</p>
+ * <p>
+ * An example of a plugin loading a datapack from within its own jar is below,
+ * assuming the datapack is included under {@code resources/pack} folder:
  * <pre>{@code
  * public class YourPluginBootstrap implements PluginBootstrap {
  *     @Override
- *     public void bootstrap(BoostrapContext context) {
+ *     public void bootstrap(BootstrapContext context) {
  *         final LifecycleEventManager<BootstrapContext> manager = context.getLifecycleManager();
  *         manager.registerEventHandler(LifecycleEvents.DATAPACK_DISCOVERY, event -> {
  *             DatapackRegistrar registrar = event.registrar();
@@ -39,6 +41,7 @@ import org.jspecify.annotations.Nullable;
  *     }
  * }
  * }</pre>
+ *
  * @see io.papermc.paper.plugin.lifecycle.event.types.LifecycleEvents#DATAPACK_DISCOVERY
  */
 @ApiStatus.NonExtendable

paper-api/src/main/java/io/papermc/paper/entity/PlayerGiveResult.java

@@ -0,0 +1,39 @@
+package io.papermc.paper.entity;
+
+import java.util.Collection;
+import org.bukkit.entity.Item;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A result type used by {@link org.bukkit.entity.Player#give(ItemStack...)} and its overloads.
+ */
+@NullMarked
+public interface PlayerGiveResult {
+
+    /**
+     * A collection of itemstacks that were not added to the player's inventory as they did not fit.
+     * The collection is derived from the collections of items to add by creating copies of each stack that was not
+     * fully added to the inventory and assigning the non-added count as their amount.
+     * <p>
+     * Itemstacks found here *may* also be found as item entities in the {@link #drops()} collection, as the
+     * give logic may have dropped them.
+     *
+     * @return the unmodifiable collection of itemstacks that are leftover as they could not be added. Each element is a
+     * copy of the input stack they are derived from.
+     */
+    @Unmodifiable
+    Collection<ItemStack> leftovers();
+
+    /**
+     * A collection of item entities dropped as a result of this call to {@link org.bukkit.entity.Player#give(ItemStack...)}.
+     * The item entities contained here are not guaranteed to match the {@link #leftovers()} as plugins may cancel the
+     * spawning of item entities.
+     *
+     * @return the unmodifiable collection of dropped item entities.
+     */
+    @Unmodifiable
+    Collection<Item> drops();
+
+}

paper-api/src/main/java/io/papermc/paper/event/block/PlayerShearBlockEvent.java

@@ -12,10 +12,10 @@ import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.NullMarked;
 
 /**
- * Called when a player uses sheers on a block.
+ * Called when a player uses shears on a block.
  * <p>
- * This event is <b>not</b> called when breaking blocks with shears but instead only when a
- * player uses the sheer item on a block to garner drops from said block and/or change its state.
+ * This event is <b>not</b> called when a player breaks blocks with shears, but rather when a
+ * player uses the shears on a block to collect drops from it and/or modify its state.
  * <p>
  * Examples include shearing a pumpkin to turn it into a carved pumpkin or shearing a beehive to get honeycomb.
  */

paper-api/src/main/java/io/papermc/paper/event/entity/EntityAttemptSmashAttackEvent.java

@@ -0,0 +1,103 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when an entity attempts to perform a smash attack.
+ */
+@NullMarked
+public class EntityAttemptSmashAttackEvent extends EntityEvent {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final LivingEntity target;
+    private final ItemStack weapon;
+    private final boolean originalResult;
+    private Result result = Result.DEFAULT;
+
+    @ApiStatus.Internal
+    public EntityAttemptSmashAttackEvent(
+        final LivingEntity attacker,
+        final LivingEntity target,
+        final ItemStack weapon,
+        final boolean originalResult
+    ) {
+        super(attacker);
+        this.target = target;
+        this.weapon = weapon;
+        this.originalResult = originalResult;
+    }
+
+    /**
+     * Yields the target of the attempted smash attack.
+     *
+     * @return the target entity
+     */
+    public LivingEntity getTarget() {
+        return target;
+    }
+
+    /**
+     * Yields a copy of the itemstack used in the smash attack attempt.
+     *
+     * @return the itemstack
+     */
+    public ItemStack getWeapon() {
+        return weapon.clone();
+    }
+
+    /**
+     * Yields the original result the server computed.
+     *
+     * @return {@code true} if this attempt would have been successful by vanilla's logic, {@code false} otherwise.
+     */
+    public boolean getOriginalResult() {
+        return originalResult;
+    }
+
+    /**
+     * Yields the effective result of this event.
+     * The result may take one of three values:
+     *
+     * <ul>
+     *     <li>{@link Result#ALLOW}: The attempt will succeed.</li>
+     *     <li>{@link Result#DENY}: The attempt will fail.</li>
+     *     <li>{@link Result#DEFAULT}: The attempt will succeed if {@link #getOriginalResult()} is {@code true} and fail otherwise.</li>
+     * </ul>
+     *
+     * @return the result.
+     */
+    public Result getResult() {
+        return this.result;
+    }
+
+    /**
+     * Configures a new result for this event.
+     * The passes result may take one of three values:
+     *
+     * <ul>
+     *     <li>{@link Result#ALLOW}: The attempt will succeed.</li>
+     *     <li>{@link Result#DENY}: The attempt will fail.</li>
+     *     <li>{@link Result#DEFAULT}: The attempt will succeed if {@link #getOriginalResult()} is {@code true} and fail otherwise.</li>
+     * </ul>
+     *
+     * @param result the new result of the event.
+     */
+    public void setResult(final Result result) {
+        this.result = result;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/io/papermc/paper/event/entity/EntityEffectTickEvent.java

@@ -0,0 +1,75 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.potion.PotionEffectType;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * An event that is triggered when an entity receives a potion effect instantly
+ * or when the potion effect is applied on each tick (e.g. every 25 ticks for Poison level 1).
+ * <p>
+ * For example, this event may be called when an entity regenerates health
+ * or takes poison damage as a result of a potion effect.
+ */
+@NullMarked
+public class EntityEffectTickEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final PotionEffectType type;
+    private final int amplifier;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public EntityEffectTickEvent(final LivingEntity entity, final PotionEffectType type, final int amplifier) {
+        super(entity);
+        this.type = type;
+        this.amplifier = amplifier;
+    }
+
+    @Override
+    public LivingEntity getEntity() {
+        return (LivingEntity) super.getEntity();
+    }
+
+    /**
+     * Gets the type of the potion effect associated with this event.
+     *
+     * @return the {@link PotionEffectType} of the effect
+     */
+    public PotionEffectType getType() {
+        return type;
+    }
+
+    /**
+     * Gets the amplifier level of the potion effect associated with this event.
+     *
+     * @return the amplifier level of the potion effect
+     */
+    public int getAmplifier() {
+        return amplifier;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/io/papermc/paper/event/entity/EntityEquipmentChangedEvent.java

@@ -0,0 +1,89 @@
+package io.papermc.paper.event.entity;
+
+import java.util.Collections;
+import java.util.Map;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called whenever a change to an entity's equipment has been detected. This event is called after effects from
+ * attribute modifiers and enchantments have been updated.
+ * <p>
+ * Examples of actions that can trigger this event:
+ * <ul>
+ *     <li>An entity being added to a world.</li>
+ *     <li>A player logging in.</li>
+ *     <li>The durability of an equipment item changing.</li>
+ *     <li>A dispenser equipping an item onto an entity.</li>
+ *     <li>An entity picking up an armor or weapon item from the ground.</li>
+ *     <li>A player changing their equipped armor.</li>
+ *     <li>A player changes their currently held item.</li>
+ * </ul>
+ */
+@NullMarked
+public class EntityEquipmentChangedEvent extends EntityEvent {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Map<EquipmentSlot, EquipmentChange> equipmentChanges;
+
+    @ApiStatus.Internal
+    public EntityEquipmentChangedEvent(final LivingEntity entity, final Map<EquipmentSlot, EquipmentChange> equipmentChanges) {
+        super(entity);
+
+        this.equipmentChanges = equipmentChanges;
+    }
+
+    @Override
+    public LivingEntity getEntity() {
+        return (LivingEntity) this.entity;
+    }
+
+    /**
+     * Gets a map of changed slots to their respective equipment changes.
+     *
+     * @return the equipment changes map
+     */
+    public @Unmodifiable Map<EquipmentSlot, EquipmentChange> getEquipmentChanges() {
+        return Collections.unmodifiableMap(this.equipmentChanges);
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    /**
+     * Represents a change in equipment for a single equipment slot.
+     */
+    @ApiStatus.NonExtendable
+    public interface EquipmentChange {
+
+        /**
+         * Gets the existing item that is being replaced.
+         *
+         * @return the existing item
+         */
+        @Contract(pure = true, value = "-> new")
+        ItemStack oldItem();
+
+        /**
+         * Gets the new item that is replacing the existing item.
+         *
+         * @return the new item
+         */
+        @Contract(pure = true, value = "-> new")
+        ItemStack newItem();
+    }
+}

paper-api/src/main/java/io/papermc/paper/event/packet/ClientTickEndEvent.java

@@ -0,0 +1,29 @@
+package io.papermc.paper.event.packet;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when a {@code minecraft:client_tick_end} packet is received by the server.
+ */
+@NullMarked
+public class ClientTickEndEvent extends PlayerEvent {
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    @ApiStatus.Internal
+    public ClientTickEndEvent(final Player player) {
+        super(player);
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/io/papermc/paper/event/player/PlayerClientLoadedWorldEvent.java

@@ -0,0 +1,46 @@
+package io.papermc.paper.event.player;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when a player is marked as loaded.
+ * <p>
+ * This either happens when the player notifies the server after loading the world (closing the downloading terrain screen)
+ * or when the player has not done so for 60 ticks after joining the server or respawning.
+ */
+@NullMarked
+public class PlayerClientLoadedWorldEvent extends PlayerEvent {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final boolean timeout;
+
+    @ApiStatus.Internal
+    public PlayerClientLoadedWorldEvent(final Player who, final boolean timeout) {
+        super(who);
+        this.timeout = timeout;
+    }
+
+    /**
+     * True if the event was triggered because the server has not been notified by the player
+     * for 60 ticks after the player joined the server or respawned.
+     *
+     * @return true if the event was triggered because of a timeout
+     */
+    public boolean isTimeout() {
+        return timeout;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/io/papermc/paper/math/Rotation.java

@@ -0,0 +1,34 @@
+package io.papermc.paper.math;
+
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Represents a rotation with specified pitch and yaw values.
+ */
+@NullMarked
+public interface Rotation {
+    /**
+     * Creates a new rotation with the specified yaw and pitch values.
+     *
+     * @param yaw   the yaw component of the rotation, measured in degrees
+     * @param pitch the pitch component of the rotation, measured in degrees
+     * @return a new {@code Rotation} instance with the specified yaw and pitch
+     */
+    static Rotation rotation(float yaw, float pitch) {
+        return new RotationImpl(yaw, pitch);
+    }
+
+    /**
+     * Retrieves the pitch component of the rotation, measured in degrees.
+     *
+     * @return the pitch value in degrees
+     */
+    float pitch();
+
+    /**
+     * Retrieves the yaw component of the rotation, measured in degrees.
+     *
+     * @return the yaw value in degrees
+     */
+    float yaw();
+}

paper-api/src/main/java/io/papermc/paper/math/RotationImpl.java

@@ -0,0 +1,4 @@
+package io.papermc.paper.math;
+
+record RotationImpl(float yaw, float pitch) implements Rotation {
+}

paper-api/src/main/java/io/papermc/paper/raytracing/PositionedRayTraceConfigurationBuilder.java

@@ -0,0 +1,112 @@
+package io.papermc.paper.raytracing;
+
+import java.util.function.Predicate;
+import org.bukkit.FluidCollisionMode;
+import org.bukkit.Location;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.util.Vector;
+import org.checkerframework.checker.index.qual.NonNegative;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A builder for configuring a raytrace with a starting location
+ * and direction.
+ */
+@NullMarked
+public interface PositionedRayTraceConfigurationBuilder {
+
+    /**
+     * Sets the starting location.
+     *
+     * @param start the new starting location
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder start(Location start);
+
+    /**
+     * Sets the direction.
+     *
+     * @param direction the new direction
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder direction(Vector direction);
+
+    /**
+     * Sets the maximum distance.
+     *
+     * @param maxDistance the new maxDistance
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder maxDistance(@NonNegative double maxDistance);
+
+    /**
+     * Sets the FluidCollisionMode when looking for block collisions.
+     * <p>
+     * If collisions with passable blocks are ignored, fluid collisions are
+     * ignored as well regardless of the fluid collision mode.
+     *
+     * @param fluidCollisionMode the new FluidCollisionMode
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder fluidCollisionMode(FluidCollisionMode fluidCollisionMode);
+
+    /**
+     * Sets whether the raytrace should ignore passable blocks when looking for
+     * block collisions.
+     * <p>
+     * If collisions with passable blocks are ignored, fluid collisions are
+     * ignored as well regardless of the fluid collision mode.
+     * <p>
+     * Portal blocks are only considered passable if the ray starts within them.
+     * Apart from that collisions with portal blocks will be considered even if
+     * collisions with passable blocks are otherwise ignored.
+     *
+     * @param ignorePassableBlocks if the raytrace should ignore passable blocks
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder ignorePassableBlocks(boolean ignorePassableBlocks);
+
+    /**
+     * Sets the size of the raytrace when looking for entity collisions.
+     *
+     * @param raySize the new raytrace size
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder raySize(@NonNegative double raySize);
+
+    /**
+     * Sets the current entity filter when looking for entity collisions.
+     *
+     * @param entityFilter predicate for entities the ray can potentially collide with
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder entityFilter(Predicate<? super Entity> entityFilter);
+
+    /**
+     * Sets the current block filter when looking for block collisions.
+     *
+     * @param blockFilter predicate for blocks the ray can potentially collide with
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder blockFilter(Predicate<? super Block> blockFilter);
+
+    /**
+     * Sets the targets for the rayTrace.
+     *
+     * @param first the first target
+     * @param others the other targets
+     * @return a reference to this object
+     */
+    @Contract(value = "_, _ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder targets(RayTraceTarget first, RayTraceTarget... others);
+}

paper-api/src/main/java/io/papermc/paper/raytracing/RayTraceTarget.java

@@ -0,0 +1,9 @@
+package io.papermc.paper.raytracing;
+
+/**
+ * List of Targets a builder can target.
+ */
+public enum RayTraceTarget {
+    ENTITY,
+    BLOCK
+}

paper-api/src/main/java/io/papermc/paper/registry/RegistryKey.java

@@ -1,6 +1,7 @@
 package io.papermc.paper.registry;
 
 import io.papermc.paper.datacomponent.DataComponentType;
+import io.papermc.paper.registry.tag.TagKey;
 import net.kyori.adventure.key.Key;
 import net.kyori.adventure.key.KeyPattern;
 import net.kyori.adventure.key.Keyed;
@@ -78,7 +79,7 @@ public sealed interface RegistryKey<T> extends Keyed permits RegistryKeyImpl {
     RegistryKey<BlockType> BLOCK = create("block");
     /**
      * @apiNote use preferably only in the context of registry entries.
-     * @see io.papermc.paper.registry.data
+     * @see io.papermc.paper.registry.keys.ItemTypeKeys
      */
     @ApiStatus.Experimental // Paper - already required for registry builders
     RegistryKey<ItemType> ITEM = create("item");
@@ -209,7 +210,6 @@ public sealed interface RegistryKey<T> extends Keyed permits RegistryKeyImpl {
      * @param key the key of the typed key.
      * @return the constructed typed key.
      */
-    @ApiStatus.Experimental
     default TypedKey<T> typedKey(final Key key) {
         return TypedKey.create(this, key);
     }
@@ -220,8 +220,29 @@ public sealed interface RegistryKey<T> extends Keyed permits RegistryKeyImpl {
      * @param key the string representation of the key that will be passed to {@link Key#key(String)}.
      * @return the constructed typed key.
      */
-    @ApiStatus.Experimental
-    default TypedKey<T> typedKey(final @KeyPattern String key) {
+    default TypedKey<T> typedKey(@KeyPattern final String key) {
         return TypedKey.create(this, key);
     }
+
+    /**
+     * Constructs a new {@link TagKey} for this registry given the tag key's key.
+     *
+     * @param key the key of the typed key.
+     * @return the constructed tag key.
+     */
+    @ApiStatus.Experimental
+    default TagKey<T> tagKey(final Key key) {
+        return TagKey.create(this, key);
+    }
+
+    /**
+     * Constructs a new {@link TagKey} for this registry given the tag key's key.
+     *
+     * @param key the string representation of the key that will be passed to {@link Key#key(String)}.
+     * @return the constructed tag key.
+     */
+    @ApiStatus.Experimental
+    default TagKey<T> tagKey(@KeyPattern final String key) {
+        return TagKey.create(this, key);
+    }
 }

paper-api/src/main/java/io/papermc/paper/registry/TypedKey.java

@@ -11,7 +11,6 @@ import org.jspecify.annotations.NullMarked;
  *
  * @param <T> the value type for the registry
  */
-@ApiStatus.Experimental
 @NullMarked
 public sealed interface TypedKey<T> extends Key permits TypedKeyImpl {
 
@@ -39,7 +38,6 @@ public sealed interface TypedKey<T> extends Key permits TypedKeyImpl {
      * @param <T> value type
      * @return a new key for the value key and registry key
      */
-    @ApiStatus.Experimental
     static <T> TypedKey<T> create(final RegistryKey<T> registryKey, final Key key) {
         return new TypedKeyImpl<>(key, registryKey);
     }
@@ -53,8 +51,7 @@ public sealed interface TypedKey<T> extends Key permits TypedKeyImpl {
      * @return a new key for the value key and registry key
      * @see Key#key(String)
      */
-    @ApiStatus.Experimental
-    static <T> TypedKey<T> create(final RegistryKey<T> registryKey, final @KeyPattern String key) {
+    static <T> TypedKey<T> create(final RegistryKey<T> registryKey, @KeyPattern final String key) {
         return create(registryKey, Key.key(key));
     }
 }

paper-api/src/main/java/io/papermc/paper/registry/tag/TagKey.java

@@ -1,7 +1,9 @@
 package io.papermc.paper.registry.tag;
 
 import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.TypedKey;
 import net.kyori.adventure.key.Key;
+import net.kyori.adventure.key.KeyPattern;
 import net.kyori.adventure.key.Keyed;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Contract;
@@ -16,14 +18,28 @@ public sealed interface TagKey<T> extends Keyed permits TagKeyImpl {
      *
      * @param registryKey the registry for the tag
      * @param key         the specific key for the tag
-     * @return a new tag key
      * @param <T>         the registry value type
+     * @return a new tag key
      */
     @Contract(value = "_, _ -> new", pure = true)
     static <T> TagKey<T> create(final RegistryKey<T> registryKey, final Key key) {
         return new TagKeyImpl<>(registryKey, key);
     }
 
+    /**
+     * Creates a new tag key for a registry.
+     *
+     * @param registryKey the registry for the tag
+     * @param key         the string version of a {@link Key} that will be passed to {@link Key#key(String)} for parsing.
+     * @param <T>         the registry value type
+     * @return a new tag key
+     * @see Key#key(String)
+     */
+    @ApiStatus.Experimental
+    static <T> TagKey<T> create(final RegistryKey<T> registryKey, @KeyPattern final String key) {
+        return create(registryKey, Key.key(key));
+    }
+
     /**
      * Get the registry key for this tag key.
      *

paper-api/src/main/java/io/papermc/paper/tag/PostFlattenTagRegistrar.java

@@ -19,18 +19,20 @@ import org.jspecify.annotations.NullMarked;
  * tags only point to individual entries and not other nested tags.
  * <p>
  * An example of a custom enchant being registered to the vanilla
- * {@code #minecraft:in_enchanting_table} tag.
+ * {@code #minecraft:in_enchanting_table} tag:
  * <pre>{@code
  * class YourBootstrapClass implements PluginBootstrap {
  *
+ *     public static final TypedKey<Enchantment> CUSTOM_POINTY_ENCHANT = EnchantmentKeys.create(Key.key("papermc:pointy"));
+ *
  *     @Override
  *     public void bootstrap(BootstrapContext context) {
- *         LifecycleEventManager<BootstrapContext> manager = context.getLifecycleManager();
+ *         final LifecycleEventManager<BootstrapContext> manager = context.getLifecycleManager();
  *         manager.registerEventHandler(LifecycleEvents.TAGS.postFlatten(RegistryKey.ENCHANTMENT), event -> {
  *             final PostFlattenTagRegistrar<Enchantment> registrar = event.registrar();
  *             registrar.addToTag(
  *                 EnchantmentTagKeys.IN_ENCHANTING_TABLE,
- *                 Set.of(CUSTOM_ENCHANT)
+ *                 Set.of(CUSTOM_POINTY_ENCHANT)
  *             );
  *         });
  *     }

paper-api/src/main/java/io/papermc/paper/tag/PreFlattenTagRegistrar.java

@@ -22,9 +22,11 @@ import org.jspecify.annotations.NullMarked;
  * <pre>{@code
  * class YourBootstrapClass implements PluginBootstrap {
  *
+ *     public static final TagKey<ItemType> AXE_PICKAXE = ItemTypeTagKeys.create(Key.key("papermc:axe_pickaxe"));
+ *
  *     @Override
  *     public void bootstrap(BootstrapContext context) {
- *         LifecycleEventManager<BootstrapContext> manager = context.getLifecycleManager();
+ *         final LifecycleEventManager<BootstrapContext> manager = context.getLifecycleManager();
  *         manager.registerEventHandler(LifecycleEvents.TAGS.preFlatten(RegistryKey.ITEM), event -> {
  *             final PreFlattenTagRegistrar<ItemType> registrar = event.registrar();
  *             registrar.setTag(AXE_PICKAXE, Set.of(

paper-api/src/main/java/org/bukkit/Art.java

@@ -2,12 +2,13 @@ package org.bukkit;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryAccess;
 import io.papermc.paper.registry.RegistryBuilderFactory;
+import io.papermc.paper.registry.RegistryKey;
 import io.papermc.paper.registry.data.InlinedRegistryBuilderProvider;
 import io.papermc.paper.registry.data.PaintingVariantRegistryEntry;
 import java.util.Locale;
 import java.util.function.Consumer;
-import org.bukkit.packs.DataPack;
 import org.bukkit.util.OldEnum;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
@@ -18,8 +19,8 @@ import org.jetbrains.annotations.Nullable;
  * <p>
  * The arts listed in this interface are present in the default server
  * or can be enabled via a {@link FeatureFlag}.
- * There may be additional arts present in the server, for example from a {@link DataPack}
- * which can be accessed via {@link Registry#ART}.
+ * There may be additional arts present in the server, for example from a {@link io.papermc.paper.datapack.Datapack}
+ * which can be accessed via {@link RegistryAccess#registryAccess()} and {@link RegistryKey#PAINTING_VARIANT}.
  */
 public interface Art extends OldEnum<Art>, Keyed {
 
@@ -87,7 +88,7 @@ public interface Art extends OldEnum<Art>, Keyed {
 
     @NotNull
     private static Art getArt(@NotNull String key) {
-        return Registry.ART.getOrThrow(NamespacedKey.minecraft(key));
+        return RegistryAccess.registryAccess().getRegistry(RegistryKey.PAINTING_VARIANT).getOrThrow(NamespacedKey.minecraft(key));
     }
 
     /**
@@ -108,9 +109,9 @@ public interface Art extends OldEnum<Art>, Keyed {
      * Get the ID of this painting.
      *
      * @return The ID of this painting
-     * @deprecated Magic value
+     * @deprecated Magic value that is based on inconsistent, data-driven registry
      */
-    @Deprecated(since = "1.6.2")
+    @Deprecated(since = "1.6.2", forRemoval = true)
     int getId();
 
     // Paper start - deprecate getKey
@@ -161,9 +162,9 @@ public interface Art extends OldEnum<Art>, Keyed {
      *
      * @param id The ID
      * @return The painting
-     * @deprecated Magic value
+     * @deprecated Magic value that is based on inconsistent, data-driven registry
      */
-    @Deprecated(since = "1.6.2")
+    @Deprecated(since = "1.6.2", forRemoval = true)
     @Nullable
     static Art getById(int id) {
         for (Art art : Registry.ART) {
@@ -189,7 +190,7 @@ public interface Art extends OldEnum<Art>, Keyed {
     static Art getByName(@NotNull String name) {
         Preconditions.checkArgument(name != null, "Name cannot be null");
 
-        return Bukkit.getUnsafe().get(Registry.ART, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        return Bukkit.getUnsafe().get(RegistryKey.PAINTING_VARIANT, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
     }
 
     /**
@@ -200,7 +201,7 @@ public interface Art extends OldEnum<Art>, Keyed {
     @NotNull
     @Deprecated(since = "1.21.3", forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.22") // Paper - will be removed via asm-utils
     static Art valueOf(@NotNull String name) {
-        Art art = Bukkit.getUnsafe().get(Registry.ART, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        Art art = Bukkit.getUnsafe().get(RegistryKey.PAINTING_VARIANT, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
         Preconditions.checkArgument(art != null, "No art found with the name %s", name);
         return art;
     }

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -40,6 +40,7 @@ import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.inventory.ItemCraftResult;
 import org.bukkit.inventory.ItemFactory;
 import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.MenuType;
 import org.bukkit.inventory.Merchant;
 import org.bukkit.inventory.Recipe;
 import org.bukkit.inventory.meta.ItemMeta;
@@ -929,7 +930,6 @@ public final class Bukkit {
      * @param id the id of the map to get
      * @return a map view if it exists, or null otherwise
      */
-    // @Deprecated(since = "1.6.2") // Paper - Not a magic value
     @Nullable
     public static MapView getMap(int id) {
         return server.getMap(id);
@@ -1116,20 +1116,24 @@ public final class Bukkit {
 
     /**
      * Adds a recipe to the crafting manager.
+     * Recipes added with this method won't be sent to the client automatically.
+     * <p>
+     * Players still have to discover recipes via {@link Player#discoverRecipe(NamespacedKey)}
+     * before seeing them in their recipe book.
      *
      * @param recipe the recipe to add
-     * @return true if the recipe was added, false if it wasn't for some
-     *     reason
+     * @return true if the recipe was added, false if it wasn't for some reason
+     * @see #addRecipe(Recipe, boolean)
      */
     @Contract("null -> false")
     public static boolean addRecipe(@Nullable Recipe recipe) {
         return server.addRecipe(recipe);
     }
 
-    // Paper start - method to send recipes immediately
     /**
      * Adds a recipe to the crafting manager.
      *
+     * @apiNote resendRecipes is ignored at the moment for stability reasons, recipes will always be updated
      * @param recipe the recipe to add
      * @param resendRecipes true to update the client with the full set of recipes
      * @return true if the recipe was added, false if it wasn't for some reason
@@ -1138,7 +1142,6 @@ public final class Bukkit {
     public static boolean addRecipe(@Nullable Recipe recipe, boolean resendRecipes) {
         return server.addRecipe(recipe, resendRecipes);
     }
-    // Paper end - method to send recipes immediately
 
     /**
      * Get a list of all recipes for a given item. The stack size is ignored
@@ -1372,7 +1375,11 @@ public final class Bukkit {
      * Sets the radius, in blocks, around each worlds spawn point to protect.
      *
      * @param value new spawn radius, or 0 if none
+     * @deprecated has not functioned for a long time as the spawn radius is defined by the server.properties file.
+     * There is no API replacement for this method. It is generally recommended to implement "protection"-like behaviour
+     * via events or third-party plugin APIs.
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     public static void setSpawnRadius(int value) {
         server.setSpawnRadius(value);
     }
@@ -1384,7 +1391,7 @@ public final class Bukkit {
      * @return true if the server should send a preview, false otherwise
      * @deprecated chat previews have been removed
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     public static boolean shouldSendChatPreviews() {
         return server.shouldSendChatPreviews();
     }
@@ -1507,7 +1514,6 @@ public final class Bukkit {
      * @return an offline player
      * @see #getOfflinePlayer(java.util.UUID)
      */
-    // @Deprecated(since = "1.7.5") // Paper
     @NotNull
     public static OfflinePlayer getOfflinePlayer(@NotNull String name) {
         return server.getOfflinePlayer(name);
@@ -1925,7 +1931,10 @@ public final class Bukkit {
      * @param title the title of the corresponding merchant inventory, displayed
      * when the merchant inventory is viewed
      * @return a new merchant
+     * @deprecated The title parameter is no-longer needed when used with
+     * {@link MenuType#MERCHANT} and {@link MenuType.Typed#builder()}.
      */
+    @Deprecated(since = "1.21.4")
     public static @NotNull Merchant createMerchant(net.kyori.adventure.text.@Nullable Component title) {
         return server.createMerchant(title);
     }
@@ -1936,7 +1945,8 @@ public final class Bukkit {
      * @param title the title of the corresponding merchant inventory, displayed
      * when the merchant inventory is viewed
      * @return a new merchant
-     * @deprecated in favour of {@link #createMerchant(net.kyori.adventure.text.Component)}
+     * @deprecated in favour of {@link #createMerchant(net.kyori.adventure.text.Component)}. The title parameter is
+     * no-longer needed when used with {@link MenuType#MERCHANT} and {@link MenuType.Typed#builder()}
      */
     @NotNull
     @Deprecated // Paper
@@ -1944,6 +1954,16 @@ public final class Bukkit {
         return server.createMerchant(title);
     }
 
+    /**
+     * Creates an empty merchant.
+     *
+     * @return a new merchant
+     */
+    @NotNull
+    public static Merchant createMerchant() {
+        return server.createMerchant();
+    }
+
     /**
      * Gets the amount of consecutive neighbor updates before skipping
      * additional ones.
@@ -2961,8 +2981,19 @@ public final class Bukkit {
     }
     // Paper end - Folia region threading API
 
+    /**
+     * @deprecated All methods on this class have been deprecated, see the individual methods for replacements.
+     */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     @NotNull
     public static Server.Spigot spigot() {
         return server.spigot();
     }
+
+    /**
+     * Restarts the server. If the server administrator has not configured restarting, the server will stop.
+     */
+    public static void restart() {
+        server.restart();
+    }
 }

paper-api/src/main/java/org/bukkit/ChunkSnapshot.java

@@ -65,7 +65,7 @@ public interface ChunkSnapshot {
      * @return 0-15
      * @deprecated Magic value
      */
-    @Deprecated(since = "1.6.2")
+    @Deprecated(since = "1.6.2", forRemoval = true)
     int getData(int x, int y, int z);
 
     /**

paper-api/src/main/java/org/bukkit/Effect.java

@@ -27,70 +27,70 @@ public enum Effect {
      * @deprecated no longer exists
      * @see Sound#BLOCK_WOODEN_DOOR_OPEN
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     DOOR_TOGGLE(1006, Type.SOUND),
     /**
      * Sound of a door opening.
      * @deprecated no longer exists
      * @see Sound#BLOCK_IRON_DOOR_OPEN
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     IRON_DOOR_TOGGLE(1005, Type.SOUND),
     /**
      * Sound of a trapdoor opening.
      * @deprecated no longer exists
      * @see Sound#BLOCK_WOODEN_TRAPDOOR_OPEN
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     TRAPDOOR_TOGGLE(1007, Type.SOUND),
     /**
      * Sound of a door opening.
      * @deprecated no longer exists
      * @see Sound#BLOCK_IRON_TRAPDOOR_OPEN
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     IRON_TRAPDOOR_TOGGLE(1037, Type.SOUND),
     /**
      * Sound of a door opening.
      * @deprecated no longer exists
      * @see Sound#BLOCK_FENCE_GATE_OPEN
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     FENCE_GATE_TOGGLE(1008, Type.SOUND),
     /**
      * Sound of a door closing.
      * @deprecated no longer exists
      * @see Sound#BLOCK_WOODEN_DOOR_CLOSE
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     DOOR_CLOSE(1012, Type.SOUND),
     /**
      * Sound of a door closing.
      * @deprecated no longer exists
      * @see Sound#BLOCK_IRON_DOOR_CLOSE
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     IRON_DOOR_CLOSE(1011, Type.SOUND),
     /**
      * Sound of a trapdoor closing.
      * @deprecated no longer exists
      * @see Sound#BLOCK_WOODEN_TRAPDOOR_CLOSE
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     TRAPDOOR_CLOSE(1013, Type.SOUND),
     /**
      * Sound of a door closing.
      * @deprecated no longer exists
      * @see Sound#BLOCK_IRON_TRAPDOOR_CLOSE
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     IRON_TRAPDOOR_CLOSE(1036, Type.SOUND),
     /**
      * Sound of a door closing.
      * @deprecated no longer exists
      * @see Sound#BLOCK_FENCE_GATE_CLOSE
      */
-    @Deprecated(since = "1.19.3")
+    @Deprecated(since = "1.19.3", forRemoval = true)
     FENCE_GATE_CLOSE(1014, Type.SOUND),
     /**
      * Sound of fire being extinguished.

paper-api/src/main/java/org/bukkit/EntityEffect.java

@@ -1,9 +1,14 @@
 package org.bukkit;
 
 import com.google.common.base.Preconditions;
-import org.bukkit.entity.Ageable;
+import io.papermc.paper.datacomponent.DataComponentTypes;
+import org.bukkit.entity.Allay;
+import org.bukkit.entity.Animals;
+import org.bukkit.entity.Armadillo;
 import org.bukkit.entity.ArmorStand;
+import org.bukkit.entity.Arrow;
 import org.bukkit.entity.Cat;
+import org.bukkit.entity.Creaking;
 import org.bukkit.entity.Dolphin;
 import org.bukkit.entity.Egg;
 import org.bukkit.entity.Entity;
@@ -15,6 +20,8 @@ import org.bukkit.entity.Guardian;
 import org.bukkit.entity.Hoglin;
 import org.bukkit.entity.IronGolem;
 import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Mob;
+import org.bukkit.entity.Ocelot;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.Rabbit;
 import org.bukkit.entity.Ravager;
@@ -23,7 +30,6 @@ import org.bukkit.entity.Sniffer;
 import org.bukkit.entity.Snowball;
 import org.bukkit.entity.Squid;
 import org.bukkit.entity.Tameable;
-import org.bukkit.entity.TippedArrow;
 import org.bukkit.entity.Villager;
 import org.bukkit.entity.Warden;
 import org.bukkit.entity.Witch;
@@ -32,32 +38,34 @@ import org.bukkit.entity.Zoglin;
 import org.bukkit.entity.ZombieVillager;
 import org.bukkit.entity.minecart.ExplosiveMinecart;
 import org.bukkit.entity.minecart.SpawnerMinecart;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
+import java.util.Set;
 
 /**
- * A list of all Effects that can happen to entities.
+ * A list of all effects that can happen to entities.
  */
 public enum EntityEffect {
 
     /**
-     * Colored particles from a tipped arrow.
+     * Colored particles from an arrow.
      */
-    ARROW_PARTICLES(0, TippedArrow.class),
+    ARROW_PARTICLES(0, Arrow.class),
     /**
      * Rabbit jumping.
      */
     RABBIT_JUMP(1, Rabbit.class),
     /**
-     * Resets a spawner minecart's delay to 200. Does not effect actual spawning
-     * delay, only the speed at which the entity in the spawner spins
+     * Resets a spawner minecart's delay to 200. Does not affect actual spawning
+     * delay, only the speed at which the entity in the spawner spins.
      */
     RESET_SPAWNER_MINECART_DELAY(1, SpawnerMinecart.class),
     /**
      * When mobs get hurt.
      *
-     * @deprecated Use {@link LivingEntity#playHurtAnimation(float)}
+     * @deprecated use {@link LivingEntity#playHurtAnimation(float)}
      */
-    @Deprecated(since = "1.20.1")
+    @Deprecated(since = "1.20.1", forRemoval = true)
     HURT(2, LivingEntity.class),
     /**
      * When a mob dies.
@@ -65,58 +73,97 @@ public enum EntityEffect {
      * <b>This will cause client-glitches!</b>
      *
      * @deprecated split into individual effects
-     * @see #EGG_BREAK
-     * @see #SNOWBALL_BREAK
+     * @see #PROJECTILE_CRACK
      * @see #ENTITY_DEATH
      */
-    @Deprecated(since = "1.12.2")
+    @Deprecated(since = "1.12.2", forRemoval = true)
     DEATH(3, Entity.class),
     /**
-     * Spawns the egg breaking particles
+     * Spawns the egg breaking particles.
+     *
+     * @deprecated use {@link #PROJECTILE_CRACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     EGG_BREAK(3, Egg.class),
     /**
-     * Spawns the snowball breaking particles
+     * Spawns the snowball breaking particles.
+     *
+     * @deprecated use {@link #PROJECTILE_CRACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     SNOWBALL_BREAK(3, Snowball.class),
     /**
-     * Plays the entity death sound and animation
+     * Shows the crack particles when a projectile
+     * hits something.
+     */
+    PROJECTILE_CRACK(3, Egg.class, Snowball.class),
+    /**
+     * Plays the entity death sound and animation.
      * <p>
      * <b>This will cause client-glitches!</b>
      */
     ENTITY_DEATH(3, LivingEntity.class),
     /**
-     * Plays the fang attack animation
+     * Plays the evoker's fang attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     FANG_ATTACK(4, EvokerFangs.class),
     /**
-     * Plays the hoglin attack animation
+     * Plays the hoglin attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     HOGLIN_ATTACK(4, Hoglin.class),
     /**
-     * Plays the iron golem attack animation
+     * Plays the iron golem attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     IRON_GOLEN_ATTACK(4, IronGolem.class),
     /**
-     * Plays the ravager attack animation
+     * Plays the ravager attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     RAVAGER_ATTACK(4, Ravager.class),
     /**
-     * Plays the warden attack animation
+     * Plays the warden attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     WARDEN_ATTACK(4, Warden.class),
     /**
-     * Plays the zoglin attack animation
+     * Plays the zoglin attack animation.
+     *
+     * @deprecated use {@link #ENTITY_ATTACK}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     ZOGLIN_ATTACK(4, Zoglin.class),
+    /**
+     * Plays an attack animation for the respective entities.
+     */
+    ENTITY_ATTACK(4, EvokerFangs.class, Hoglin.class, IronGolem.class, Ravager.class, Warden.class, Zoglin.class, Creaking.class),
     // 5 - unused
     /**
      * The smoke when taming an entity fails.
+     *
      * @deprecated use {@link EntityEffect#TAMING_FAILED}
      */
-    @Deprecated(since = "1.21") // Paper
+    @Deprecated(since = "1.21", forRemoval = true)
     WOLF_SMOKE(6, Tameable.class),
-    // Paper start - rename "wolf" effects
+    /**
+     * The hearts when taming an entity succeeds.
+     *
+     * @deprecated use {@link EntityEffect#TAMING_SUCCEEDED}
+     */
+    @Deprecated(since = "1.21", forRemoval = true)
+    WOLF_HEARTS(7, Tameable.class),
     /**
      * The smoke when taming an entity fails.
      */
@@ -125,20 +172,13 @@ public enum EntityEffect {
      * The hearts when taming an entity succeeds.
      */
     TAMING_SUCCEEDED(7, Tameable.class),
-    // Paper end - rename "wolf" effects
-    /**
-     * The hearts when taming an entity succeeds.
-     * @deprecated use {@link EntityEffect#TAMING_SUCCEEDED}
-     */
-    @Deprecated(since = "1.21") // Paper
-    WOLF_HEARTS(7, Tameable.class),
     /**
      * When a wolf shakes (after being wet).
      *
      * @see EntityEffect#WOLF_SHAKE_STOP
      */
     WOLF_SHAKE(8, Wolf.class),
-    // 9 - unused
+    // 9 - internal
     /**
      * When an entity eats a LONG_GRASS block.
      *
@@ -146,10 +186,10 @@ public enum EntityEffect {
      * @see #SHEEP_EAT_GRASS
      * @see #TNT_MINECART_IGNITE
      */
-    @Deprecated(since = "1.12.2")
+    @Deprecated(since = "1.12.2", forRemoval = true)
     SHEEP_EAT(10, Entity.class),
     /**
-     * Plays the sheep eating grass animation
+     * Plays the sheep eating grass animation.
      */
     SHEEP_EAT_GRASS(10, Sheep.class),
     /**
@@ -179,7 +219,8 @@ public enum EntityEffect {
      */
     WITCH_MAGIC(15, Witch.class),
     /**
-     * When a zombie transforms into a villager by shaking violently.
+     * Plays the sound when a zombie villager is
+     * cured.
      */
     ZOMBIE_TRANSFORM(16, ZombieVillager.class),
     /**
@@ -187,9 +228,10 @@ public enum EntityEffect {
      */
     FIREWORK_EXPLODE(17, Firework.class),
     /**
-     * Hearts from a breeding entity.
+     * Hearts from a breeding entity
+     * or when an Allay duplicates.
      */
-    LOVE_HEARTS(18, Ageable.class),
+    LOVE_HEARTS(18, Animals.class, Allay.class),
     /**
      * Resets squid rotation.
      */
@@ -197,7 +239,7 @@ public enum EntityEffect {
     /**
      * Silverfish entering block, spawner spawning.
      */
-    ENTITY_POOF(20, LivingEntity.class),
+    ENTITY_POOF(20, Mob.class),
     /**
      * Guardian plays the attack sound effect.
      */
@@ -218,9 +260,10 @@ public enum EntityEffect {
     ARMOR_STAND_HIT(32, ArmorStand.class),
     /**
      * Entity hurt by thorns attack.
+     *
      * @deprecated in favor of {@link LivingEntity#playHurtAnimation(float)} or {@link Entity#broadcastHurtAnimation(java.util.Collection)}
      */
-    @Deprecated(since = "1.19.4", forRemoval = true) // Paper
+    @Deprecated(since = "1.19.4", forRemoval = true)
     THORNS_HURT(33, LivingEntity.class),
     /**
      * Iron golem puts away rose.
@@ -228,16 +271,27 @@ public enum EntityEffect {
     IRON_GOLEM_SHEATH(34, IronGolem.class),
     /**
      * Totem prevents entity death.
+     *
+     * @deprecated see {@link #PROTECTED_FROM_DEATH}
      */
+    @Deprecated(since = "1.21.2", forRemoval = true)
     TOTEM_RESURRECT(35, LivingEntity.class),
+    /**
+     * Item with {@link DataComponentTypes#DEATH_PROTECTION} prevents entity death.
+     * For player, the item selected will be shown for a moment on the screen, if the
+     * item is not found a totem will appear.
+     */
+    PROTECTED_FROM_DEATH(35, Entity.class),
     /**
      * Entity hurt due to drowning damage.
+     *
      * @deprecated in favor of {@link LivingEntity#playHurtAnimation(float)} or {@link Entity#broadcastHurtAnimation(java.util.Collection)}
      */
     @Deprecated(since = "1.19.4", forRemoval = true)
     HURT_DROWN(36, LivingEntity.class),
     /**
      * Entity hurt due to explosion damage.
+     *
      * @deprecated in favor of {@link LivingEntity#playHurtAnimation(float)} or {@link Entity#broadcastHurtAnimation(java.util.Collection)}
      */
     @Deprecated(since = "1.19.4", forRemoval = true)
@@ -252,66 +306,94 @@ public enum EntityEffect {
     RAVAGER_STUNNED(39, Ravager.class),
     /**
      * Cat taming failed.
+     *
+     * @deprecated use {@link #TRUSTING_FAILED}
      */
+    @Deprecated(since = "1.14", forRemoval = true)
     CAT_TAME_FAIL(40, Cat.class),
     /**
      * Cat taming succeeded.
+     *
+     * @deprecated use {@link #TRUSTING_SUCCEEDED}
      */
+    @Deprecated(since = "1.14", forRemoval = true)
     CAT_TAME_SUCCESS(41, Cat.class),
+    /**
+     * Ocelot trusting failed.
+     */
+    TRUSTING_FAILED(40, Ocelot.class),
+    /**
+     * Ocelot trusting succeeded.
+     */
+    TRUSTING_SUCCEEDED(41, Ocelot.class),
     /**
      * Villager splashes particles during a raid.
      */
     VILLAGER_SPLASH(42, Villager.class),
     /**
      * Player's bad omen effect removed to start or increase raid difficult.
+     *
      * @deprecated raid system was overhauled in 1.20.5
      */
     @Deprecated(since = "1.20.5", forRemoval = true)
     PLAYER_BAD_OMEN_RAID(43, Player.class),
     /**
      * Entity hurt due to berry bush. Prickly!
+     *
      * @deprecated in favor of {@link LivingEntity#playHurtAnimation(float)} or {@link Entity#broadcastHurtAnimation(java.util.Collection)}
      */
     @Deprecated(since = "1.19.4", forRemoval = true)
     HURT_BERRY_BUSH(44, LivingEntity.class),
     /**
-     * Fox chews the food in its mouth
+     * Fox chews the food in its mouth.
      */
     FOX_CHEW(45, Fox.class),
     /**
-     * Entity teleported as a result of chorus fruit or as an enderman
+     * Entity teleported as a result of chorus fruit or as an enderman.
      */
     TELEPORT_ENDER(46, LivingEntity.class),
     /**
-     * Entity breaks item in main hand
+     * Entity breaks item in main hand.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#HAND
      */
     BREAK_EQUIPMENT_MAIN_HAND(47, LivingEntity.class),
     /**
-     * Entity breaks item in off hand
+     * Entity breaks item in off hand.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#OFF_HAND
      */
     BREAK_EQUIPMENT_OFF_HAND(48, LivingEntity.class),
     /**
-     * Entity breaks item in helmet slot
+     * Entity breaks item in helmet slot.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#HEAD
      */
     BREAK_EQUIPMENT_HELMET(49, LivingEntity.class),
     /**
-     * Entity breaks item in chestplate slot
+     * Entity breaks item in chestplate slot.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#CHEST
      */
     BREAK_EQUIPMENT_CHESTPLATE(50, LivingEntity.class),
     /**
-     * Entity breaks item in legging slot
+     * Entity breaks item in legging slot.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#LEGS
      */
     BREAK_EQUIPMENT_LEGGINGS(51, LivingEntity.class),
     /**
-     * Entity breaks item in boot slot
+     * Entity breaks item in boot slot.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#FEET
      */
     BREAK_EQUIPMENT_BOOTS(52, LivingEntity.class),
     /**
-     * Spawns honey block slide particles at the entity's feet
+     * Spawns honey block slide particles at the entity's feet.
      */
     HONEY_BLOCK_SLIDE_PARTICLES(53, Entity.class),
     /**
-     * Spawns honey block fall particles at the entity's feet
+     * Spawns honey block fall particles at the entity's feet.
      */
     HONEY_BLOCK_FALL_PARTICLES(54, LivingEntity.class),
     /**
@@ -319,110 +401,136 @@ public enum EntityEffect {
      */
     SWAP_HAND_ITEMS(55, LivingEntity.class),
     /**
-     * Stops a wolf that is currently shaking
+     * Stops a wolf that is currently shaking.
      *
      * @see EntityEffect#WOLF_SHAKE
      */
     WOLF_SHAKE_STOP(56, Wolf.class),
     // 57 - unused
     /**
-     * Goat lowers its head for ramming
+     * Goat lowers its head for ramming.
      *
      * @see #GOAT_RAISE_HEAD
      */
     GOAT_LOWER_HEAD(58, Goat.class),
     /**
-     * Goat raises its head
+     * Goat raises its head.
      *
      * @see #GOAT_LOWER_HEAD
      */
     GOAT_RAISE_HEAD(59, Goat.class),
     /**
-     * Spawns death smoke particles
+     * Spawns death smoke particles.
      */
     SPAWN_DEATH_SMOKE(60, LivingEntity.class),
     /**
-     * Warden shakes its tendrils
+     * Warden shakes its tendrils.
      */
     WARDEN_TENDRIL_SHAKE(61, Warden.class),
     /**
-     * Warden performs sonic attack animation <br>
-     * Does not play the sound or fire the beam
+     * Warden performs sonic attack animation.
+     * <br>
+     * Does not play the sound or fire the beam.
      */
     WARDEN_SONIC_ATTACK(62, Warden.class),
     /**
-     * Plays sniffer digging sound <br>
+     * Plays sniffer digging sound.
+     * <br>
      * Sniffer must have a target and be in {@link Sniffer.State#SEARCHING} or
-     * {@link Sniffer.State#DIGGING}
+     * {@link Sniffer.State#DIGGING}.
      */
     SNIFFER_DIG(63, Sniffer.class),
-    // Paper start - add missing EntityEffect
     /**
      * Armadillo peeks out of its shell
      */
-    ARMADILLO_PEEK(64, org.bukkit.entity.Armadillo.class),
+    ARMADILLO_PEEK(64, Armadillo.class),
     /**
-     * {@link org.bukkit.inventory.EquipmentSlot#BODY} armor piece breaks
+     * {@link org.bukkit.inventory.EquipmentSlot#BODY} armor piece breaks.
+     *
+     * @deprecated use {@link #BREAK_EQUIPMENT_BODY}
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     BODY_BREAK(65, LivingEntity.class),
+    /**
+     * Entity breaks item in body slot.
+     *
+     * @see org.bukkit.inventory.EquipmentSlot#BODY
+     */
+    BREAK_EQUIPMENT_BODY(65, LivingEntity.class),
     /**
      * A creaking transient shaking when being hit.
      * Does not apply to plain creaking entities as they are not invulnerable like the transient ones spawned by the
      * creaking heart.
      */
-    SHAKE(66, org.bukkit.entity.Creaking.class);
-    // Paper end - add missing EntityEffect
+    SHAKE(66, Creaking.class);
 
     private final byte data;
-    private final Class<? extends Entity> applicable;
+    private final Set<Class<? extends Entity>> applicableClasses;
 
-    EntityEffect(final int data, /*@NotNull*/ Class<? extends Entity> clazz) {
+    EntityEffect(int data, Class<? extends Entity>... applicableClasses) {
+        Preconditions.checkState(applicableClasses.length > 0, "Unknown applicable classes");
         this.data = (byte) data;
-        this.applicable = clazz;
+        this.applicableClasses = Set.of(applicableClasses);
     }
 
     /**
-     * Gets the data value of this EntityEffect, may not be unique.
+     * Gets the data value of this entity effect, may not be unique.
      *
-     * @return The data value
-     * @apiNote Internal Use Only
+     * @return the data value
      */
-    @org.jetbrains.annotations.ApiStatus.Internal // Paper
+    @ApiStatus.Internal
     public byte getData() {
-        return data;
+        return this.data;
     }
 
     /**
-     * Gets entity superclass which this affect is applicable to.
+     * Gets entity superclass which this entity effect is applicable to.
      *
      * @return applicable class
+     * @deprecated an entity effect can apply to multiple superclasses, see {@link #getApplicableClasses()}
      */
     @NotNull
+    @Deprecated(since = "1.21.4")
     public Class<? extends Entity> getApplicable() {
-        return applicable;
+        return this.applicableClasses.iterator().next();
     }
 
     /**
-     * Checks if this effect is applicable to the given entity.
+     * Gets the entity superclasses which this entity effect is applicable to.
+     *
+     * @return the applicable classes
+     */
+    @NotNull
+    public Set<Class<? extends Entity>> getApplicableClasses() {
+        return this.applicableClasses;
+    }
+
+    /**
+     * Checks if this entity effect is applicable to the given entity.
      *
      * @param entity the entity to check
-     * @return true if applicable
+     * @return {@code true} if applicable
      */
     public boolean isApplicableTo(@NotNull Entity entity) {
         Preconditions.checkArgument(entity != null, "Entity cannot be null");
 
-        return isApplicableTo(entity.getClass());
+        return this.isApplicableTo(entity.getClass());
     }
 
     /**
-     * Checks if this effect is applicable to the given entity class.
+     * Checks if this entity effect is applicable to the given entity class.
      *
      * @param clazz the entity class to check
-     * @return true if applicable
+     * @return {@code true} if applicable
      */
     public boolean isApplicableTo(@NotNull Class<? extends Entity> clazz) {
         Preconditions.checkArgument(clazz != null, "Class cannot be null");
 
-        return applicable.isAssignableFrom(clazz);
+        for (Class<? extends Entity> applicableClass : this.applicableClasses) {
+            if (applicableClass.isAssignableFrom(clazz)) {
+                return true;
+            }
+        }
+        return false;
     }
 }

paper-api/src/main/java/org/bukkit/Fluid.java

@@ -2,6 +2,7 @@ package org.bukkit;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryKey;
 import java.util.Locale;
 import org.bukkit.util.OldEnum;
 import org.jetbrains.annotations.NotNull;
@@ -45,7 +46,7 @@ public interface Fluid extends OldEnum<Fluid>, Keyed {
     @NotNull
     @Deprecated(since = "1.21.3", forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.22") // Paper - will be removed via asm-utils
     static Fluid valueOf(@NotNull String name) {
-        Fluid fluid = Bukkit.getUnsafe().get(Registry.FLUID, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        Fluid fluid = Bukkit.getUnsafe().get(RegistryKey.FLUID, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
         Preconditions.checkArgument(fluid != null, "No fluid found with the name %s", name);
         return fluid;
     }

paper-api/src/main/java/org/bukkit/JukeboxSong.java

@@ -1,5 +1,7 @@
 package org.bukkit;
 
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
@@ -31,7 +33,7 @@ public interface JukeboxSong extends Keyed, Translatable {
 
     @NotNull
     private static JukeboxSong get(@NotNull String key) {
-        return Registry.JUKEBOX_SONG.getOrThrow(NamespacedKey.minecraft(key));
+        return RegistryAccess.registryAccess().getRegistry(RegistryKey.JUKEBOX_SONG).getOrThrow(NamespacedKey.minecraft(key));
     }
 
     // Paper start - adventure

paper-api/src/main/java/org/bukkit/Location.java

@@ -3,24 +3,22 @@ package org.bukkit;
 import com.google.common.base.Preconditions;
 import java.lang.ref.Reference;
 import java.lang.ref.WeakReference;
-import com.google.common.base.Preconditions; // Paper
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.function.Predicate;
+import io.papermc.paper.math.FinePosition;
+import io.papermc.paper.math.Rotation;
 import org.bukkit.block.Block;
 import org.bukkit.configuration.serialization.ConfigurationSerializable;
-import org.bukkit.entity.Entity; // Paper
-import org.bukkit.util.NumberConversions;
-import org.bukkit.util.Vector;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-// Paper start
-import java.util.Collection;
-import java.util.function.Predicate;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Player;
-// Paper end
+import org.bukkit.util.NumberConversions;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Represents a 3-dimensional position in a world.
@@ -30,7 +28,7 @@ import org.bukkit.entity.Player;
  * magnitude than 360 are valid, but may be normalized to any other equivalent
  * representation by the implementation.
  */
-public class Location implements Cloneable, ConfigurationSerializable, io.papermc.paper.math.FinePosition { // Paper
+public class Location implements Cloneable, ConfigurationSerializable, io.papermc.paper.math.FinePosition {
     private Reference<World> world;
     private double x;
     private double y;
@@ -46,7 +44,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
      * @param y The y-coordinate of this new location
      * @param z The z-coordinate of this new location
      */
-    public Location(@UndefinedNullability final World world, final double x, final double y, final double z) { // Paper
+    public Location(@UndefinedNullability final World world, final double x, final double y, final double z) {
         this(world, x, y, z, 0, 0);
     }
 
@@ -60,7 +58,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
      * @param yaw The absolute rotation on the x-plane, in degrees
      * @param pitch The absolute rotation on the y-plane, in degrees
      */
-    public Location(@UndefinedNullability final World world, final double x, final double y, final double z, final float yaw, final float pitch) { // Paper
+    public Location(@UndefinedNullability final World world, final double x, final double y, final double z, final float yaw, final float pitch) {
         if (world != null) {
             this.world = new WeakReference<>(world);
         }
@@ -102,7 +100,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
      * @throws IllegalArgumentException when world is unloaded
      * @see #isWorldLoaded()
      */
-    @UndefinedNullability // Paper
+    @UndefinedNullability
     public World getWorld() {
         if (this.world == null) {
             return null;
@@ -398,6 +396,35 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return this;
     }
 
+    /**
+     * Adds rotation in the form of yaw and patch to this location. Not world-aware.
+     *
+     * @param yaw   yaw, measured in degrees.
+     * @param pitch pitch, measured in degrees.
+     * @return the same location
+     * @see Vector
+     */
+    @NotNull
+    @Contract(value = "_,_ -> this", mutates = "this")
+    public Location addRotation(final float yaw, final float pitch) {
+        this.yaw += yaw;
+        this.pitch += pitch;
+        return this;
+    }
+
+    /**
+     * Adds rotation to this location. Not world-aware.
+     *
+     * @param rotation the rotation to add.
+     * @return the same location
+     * @see Vector
+     */
+    @NotNull
+    @Contract(value = "_ -> this", mutates = "this")
+    public Location addRotation(@NotNull Rotation rotation) {
+        return addRotation(rotation.yaw(), rotation.pitch());
+    }
+
     /**
      * Subtracts the location by another.
      *
@@ -451,6 +478,35 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return this;
     }
 
+    /**
+     * Subtracts rotation in the form of yaw and patch from this location.
+     *
+     * @param yaw   yaw, measured in degrees.
+     * @param pitch pitch, measured in degrees.
+     * @return the same location
+     * @see Vector
+     */
+    @NotNull
+    @Contract(value = "_,_ -> this", mutates = "this")
+    public Location subtractRotation(final float yaw, final float pitch) {
+        this.yaw -= yaw;
+        this.pitch -= pitch;
+        return this;
+    }
+
+    /**
+     * Subtracts rotation from this location.
+     *
+     * @param rotation the rotation to subtract.
+     * @return the same location
+     * @see Vector
+     */
+    @NotNull
+    @Contract(value = "_ -> this", mutates = "this")
+    public Location subtractRotation(@NotNull Rotation rotation) {
+        return subtractRotation(rotation.yaw(), rotation.pitch());
+    }
+
     /**
      * Gets the magnitude of the location, defined as sqrt(x^2+y^2+z^2). The
      * value of this method is not cached and uses a costly square-root
@@ -543,9 +599,10 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return this;
     }
 
-    public boolean isChunkLoaded() { return this.getWorld().isChunkLoaded(locToBlock(x) >> 4, locToBlock(z) >> 4); } // Paper
+    public boolean isChunkLoaded() {
+        return this.getWorld().isChunkLoaded(locToBlock(x) >> 4, locToBlock(z) >> 4);
+    }
 
-    // Paper start - isGenerated API
     /**
      * Checks if a {@link Chunk} has been generated at this location.
      *
@@ -556,9 +613,6 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         Preconditions.checkNotNull(world, "Location has no world!");
         return world.isChunkGenerated(locToBlock(x) >> 4, locToBlock(z) >> 4);
     }
-    // Paper end - isGenerated API
-
-    // Paper start - expand location manipulation API
 
     /**
      * Sets the position of this Location and returns itself
@@ -578,6 +632,37 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return this;
     }
 
+    /**
+     * Sets the rotation of this location and returns itself.
+     * <p>
+     * This mutates this object, clone first.
+     *
+     * @param yaw   yaw, measured in degrees.
+     * @param pitch pitch, measured in degrees.
+     * @return self (not cloned)
+     */
+    @NotNull
+    @Contract(value = "_,_ -> this", mutates = "this")
+    public Location setRotation(final float yaw, final float pitch) {
+        this.yaw = yaw;
+        this.pitch = pitch;
+        return this;
+    }
+
+    /**
+     * Sets the rotation of this location and returns itself.
+     * <p>
+     * This mutates this object, clone first.
+     *
+     * @param rotation the new rotation.
+     * @return self (not cloned)
+     */
+    @NotNull
+    @Contract(value = "_ -> this", mutates = "this")
+    public Location setRotation(@NotNull Rotation rotation) {
+        return setRotation(rotation.yaw(), rotation.pitch());
+    }
+
     /**
      * Takes the x/y/z from base and adds the specified x/y/z to it and returns self
      * <p>
@@ -609,9 +694,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
     public Location subtract(@NotNull Location base, double x, double y, double z) {
         return this.set(base.x - x, base.y - y, base.z - z);
     }
-    // Paper end - expand location manipulation API
 
-    // Paper start - expand Location API
     /**
      * @return A new location where X/Y/Z are on the Block location (integer value of X/Y/Z)
      */
@@ -624,7 +707,6 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return blockLoc;
     }
 
-    // Paper start
     /**
      * @return The block key for this location's block location.
      * @see Block#getBlockKey(int, int, int)
@@ -634,7 +716,6 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
     public long toBlockKey() {
         return Block.getBlockKey(getBlockX(), getBlockY(), getBlockZ());
     }
-    // Paper end
 
     /**
      * @return A new location where X/Y/Z are the center of the block
@@ -647,9 +728,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         centerLoc.setZ(getBlockZ() + 0.5);
         return centerLoc;
     }
-    // Paper end - expand Location API
 
-    // Paper start - Add heightmap api
     /**
      * Returns a copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ())
      * @return A copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ())
@@ -671,9 +750,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         ret.setY(this.getWorld().getHighestBlockYAt(this, heightMap));
         return ret;
     }
-    // Paper end - Add heightmap api
 
-    // Paper start - Expand Explosions API
     /**
      * Creates explosion at this location with given power
      * <p>
@@ -754,9 +831,7 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
     public boolean createExplosion(@Nullable Entity source, float power, boolean setFire, boolean breakBlocks) {
         return this.getWorld().createExplosion(source, this, power, setFire, breakBlocks);
     }
-    // Paper end - Expand Explosions API
 
-    // Paper start - additional getNearbyEntities API
     /**
      * Returns a list of entities within a bounding box centered around a Location.
      * <p>
@@ -979,7 +1054,6 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         }
         return world.getNearbyEntitiesByType(clazz, this, xRadius, yRadius, zRadius, predicate);
     }
-    // Paper end - additional getNearbyEntities API
 
     @Override
     public boolean equals(Object obj) {
@@ -1155,7 +1229,6 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return pitch;
     }
 
-    // Paper - add Position
     @Override
     public double x() {
         return this.getX();
@@ -1173,12 +1246,11 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
 
     @Override
     public boolean isFinite() {
-        return io.papermc.paper.math.FinePosition.super.isFinite() && Float.isFinite(this.getYaw()) && Float.isFinite(this.getPitch());
+        return FinePosition.super.isFinite() && Float.isFinite(this.getYaw()) && Float.isFinite(this.getPitch());
     }
 
     @Override
     public @NotNull Location toLocation(@NotNull World world) {
         return new Location(world, this.x(), this.y(), this.z(), this.getYaw(), this.getPitch());
     }
-    // Paper end
 }

paper-api/src/main/java/org/bukkit/MusicInstrument.java

@@ -1,6 +1,8 @@
 package org.bukkit;
 
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
 import java.util.Collection;
 import java.util.Collections;
 import org.jetbrains.annotations.NotNull;
@@ -44,7 +46,7 @@ public abstract class MusicInstrument implements Keyed, net.kyori.adventure.tran
 
     @NotNull
     private static MusicInstrument getInstrument(@NotNull String key) {
-        return Registry.INSTRUMENT.getOrThrow(NamespacedKey.minecraft(key));
+        return RegistryAccess.registryAccess().getRegistry(RegistryKey.INSTRUMENT).getOrThrow(NamespacedKey.minecraft(key));
     }
 
     // Paper start - deprecate getKey

paper-api/src/main/java/org/bukkit/NamespacedKey.java

@@ -83,14 +83,12 @@ public final class NamespacedKey implements net.kyori.adventure.key.Key, com.des
      * @see #NamespacedKey(Plugin, String)
      */
     public NamespacedKey(@NotNull String namespace, @NotNull String key) {
-        Preconditions.checkArgument(namespace != null && isValidNamespace(namespace), "Invalid namespace. Must be [a-z0-9._-]: %s", namespace);
-        Preconditions.checkArgument(key != null && isValidKey(key), "Invalid key. Must be [a-z0-9/._-]: %s", key);
-
+        Preconditions.checkArgument(namespace != null, "Namespace cannot be null");
+        Preconditions.checkArgument(key != null, "Key cannot be null");
         this.namespace = namespace;
         this.key = key;
 
-        String string = toString();
-        Preconditions.checkArgument(string.length() <= Short.MAX_VALUE, "NamespacedKey must be less than 32768 characters", string); // Paper - Fix improper length validation
+        this.validate();
     }
 
     /**
@@ -108,16 +106,17 @@ public final class NamespacedKey implements net.kyori.adventure.key.Key, com.des
     public NamespacedKey(@NotNull Plugin plugin, @NotNull String key) {
         Preconditions.checkArgument(plugin != null, "Plugin cannot be null");
         Preconditions.checkArgument(key != null, "Key cannot be null");
-
         this.namespace = plugin.getName().toLowerCase(Locale.ROOT);
         this.key = key.toLowerCase(Locale.ROOT);
 
         // Check validity after normalization
+        this.validate();
+    }
+
+    private void validate() {
+        Preconditions.checkArgument(this.namespace.length() + 1 + this.key.length() <= Short.MAX_VALUE, "NamespacedKey must be less than 32768 characters");
         Preconditions.checkArgument(isValidNamespace(this.namespace), "Invalid namespace. Must be [a-z0-9._-]: %s", this.namespace);
         Preconditions.checkArgument(isValidKey(this.key), "Invalid key. Must be [a-z0-9/._-]: %s", this.key);
-
-        String string = toString();
-        Preconditions.checkArgument(string.length() <= Short.MAX_VALUE, "NamespacedKey must be less than 32768 characters", string); // Paper - Fix improper length validation
     }
 
     @NotNull

paper-api/src/main/java/org/bukkit/OfflinePlayer.java

@@ -11,14 +11,15 @@ import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.permissions.ServerOperator;
 import org.bukkit.profile.PlayerProfile;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Represents a reference to a player identity and the data belonging to a
  * player that is stored on the disk and can, thus, be retrieved without the
  * player needing to be online.
  */
+@NullMarked
 public interface OfflinePlayer extends ServerOperator, AnimalTamer, ConfigurationSerializable, io.papermc.paper.persistence.PersistentDataViewHolder { // Paper - Add Offline PDC API
 
     /**
@@ -62,7 +63,6 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @return Player UUID
      */
     @Override
-    @NotNull
     public UUID getUniqueId();
 
     /**
@@ -74,7 +74,6 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      *
      * @return the player's profile
      */
-    @NotNull
     com.destroystokyo.paper.profile.PlayerProfile getPlayerProfile(); // Paper
 
     /**
@@ -91,7 +90,6 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @return Ban Entry
      * @deprecated use {@link #ban(String, Date, String)}
      */
-    @NotNull
     @Deprecated(since = "1.20.4")
     public default BanEntry banPlayer(@Nullable String reason) {
         return banPlayer(reason, null, null);
@@ -104,7 +102,6 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @return Ban Entry
      * @deprecated use {@link #ban(String, Date, String)}
      */
-    @NotNull
     @Deprecated(since = "1.20.4")
     public default BanEntry banPlayer(@Nullable String reason, @Nullable String source) {
         return banPlayer(reason, null, source);
@@ -117,9 +114,8 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @return Ban Entry
      * @deprecated use {@link #ban(String, Date, String)}
      */
-    @NotNull
     @Deprecated(since = "1.20.4")
-    public default BanEntry banPlayer(@Nullable String reason, @Nullable java.util.Date expires) {
+    public default BanEntry banPlayer(@Nullable String reason, java.util.@Nullable Date expires) {
         return banPlayer(reason, expires, null);
     }
 
@@ -131,18 +127,16 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @return Ban Entry
      * @deprecated use {@link #ban(String, Date, String)}
      */
-    @NotNull
     @Deprecated(since = "1.20.4")
-    public default BanEntry banPlayer(@Nullable String reason, @Nullable java.util.Date expires, @Nullable String source) {
+    public default BanEntry banPlayer(@Nullable String reason, java.util.@Nullable Date expires, @Nullable String source) {
         return banPlayer(reason, expires, source, true);
     }
 
     /**
      * @deprecated use {@link #ban(String, Date, String)}
      */
-    @NotNull
     @Deprecated(since = "1.20.4")
-    public default BanEntry banPlayer(@Nullable String reason, @Nullable java.util.Date expires, @Nullable String source, boolean kickIfOnline) {
+    public default BanEntry banPlayer(@Nullable String reason, java.util.@Nullable Date expires, @Nullable String source, boolean kickIfOnline) {
         BanEntry banEntry = Bukkit.getServer().getBanList(BanList.Type.NAME).addBan(getName(), reason, expires, source);
         if (kickIfOnline && isOnline()) {
             getPlayer().kickPlayer(reason);
@@ -309,7 +303,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public void incrementStatistic(@NotNull Statistic statistic) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player.
@@ -322,7 +316,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public void decrementStatistic(@NotNull Statistic statistic) throws IllegalArgumentException;
+    public void decrementStatistic(Statistic statistic) throws IllegalArgumentException;
 
     /**
      * Increments the given statistic for this player.
@@ -334,7 +328,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public void incrementStatistic(@NotNull Statistic statistic, int amount) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic, int amount) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player.
@@ -346,7 +340,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public void decrementStatistic(@NotNull Statistic statistic, int amount) throws IllegalArgumentException;
+    public void decrementStatistic(Statistic statistic, int amount) throws IllegalArgumentException;
 
     /**
      * Sets the given statistic for this player.
@@ -358,7 +352,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public void setStatistic(@NotNull Statistic statistic, int newValue) throws IllegalArgumentException;
+    public void setStatistic(Statistic statistic, int newValue) throws IllegalArgumentException;
 
     /**
      * Gets the value of the given statistic for this player.
@@ -369,7 +363,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the statistic requires an
      *     additional parameter
      */
-    public int getStatistic(@NotNull Statistic statistic) throws IllegalArgumentException;
+    public int getStatistic(Statistic statistic) throws IllegalArgumentException;
 
     /**
      * Increments the given statistic for this player for the given material.
@@ -384,7 +378,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void incrementStatistic(@NotNull Statistic statistic, @NotNull Material material) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic, Material material) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player for the given material.
@@ -399,7 +393,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void decrementStatistic(@NotNull Statistic statistic, @NotNull Material material) throws IllegalArgumentException;
+    public void decrementStatistic(Statistic statistic, Material material) throws IllegalArgumentException;
 
     /**
      * Gets the value of the given statistic for this player.
@@ -412,7 +406,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public int getStatistic(@NotNull Statistic statistic, @NotNull Material material) throws IllegalArgumentException;
+    public int getStatistic(Statistic statistic, Material material) throws IllegalArgumentException;
 
     /**
      * Increments the given statistic for this player for the given material.
@@ -426,7 +420,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void incrementStatistic(@NotNull Statistic statistic, @NotNull Material material, int amount) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic, Material material, int amount) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player for the given material.
@@ -440,7 +434,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void decrementStatistic(@NotNull Statistic statistic, @NotNull Material material, int amount) throws IllegalArgumentException;
+    public void decrementStatistic(Statistic statistic, Material material, int amount) throws IllegalArgumentException;
 
     /**
      * Sets the given statistic for this player for the given material.
@@ -454,7 +448,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void setStatistic(@NotNull Statistic statistic, @NotNull Material material, int newValue) throws IllegalArgumentException;
+    public void setStatistic(Statistic statistic, Material material, int newValue) throws IllegalArgumentException;
 
     /**
      * Increments the given statistic for this player for the given entity.
@@ -469,7 +463,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void incrementStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic, EntityType entityType) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player for the given entity.
@@ -484,7 +478,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void decrementStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType) throws IllegalArgumentException;
+    public void decrementStatistic(Statistic statistic, EntityType entityType) throws IllegalArgumentException;
 
     /**
      * Gets the value of the given statistic for this player.
@@ -497,7 +491,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public int getStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType) throws IllegalArgumentException;
+    public int getStatistic(Statistic statistic, EntityType entityType) throws IllegalArgumentException;
 
     /**
      * Increments the given statistic for this player for the given entity.
@@ -511,7 +505,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void incrementStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType, int amount) throws IllegalArgumentException;
+    public void incrementStatistic(Statistic statistic, EntityType entityType, int amount) throws IllegalArgumentException;
 
     /**
      * Decrements the given statistic for this player for the given entity.
@@ -525,7 +519,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void decrementStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType, int amount);
+    public void decrementStatistic(Statistic statistic, EntityType entityType, int amount);
 
     /**
      * Sets the given statistic for this player for the given entity.
@@ -539,7 +533,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @throws IllegalArgumentException if the given parameter is not valid
      *     for the statistic
      */
-    public void setStatistic(@NotNull Statistic statistic, @NotNull EntityType entityType, int newValue);
+    public void setStatistic(Statistic statistic, EntityType entityType, int newValue);
 
     /**
      * Gets the player's last death location.
@@ -571,6 +565,6 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      * @see io.papermc.paper.persistence.PersistentDataViewHolder#getPersistentDataContainer()
      */
     @Override
-    io.papermc.paper.persistence.@NotNull PersistentDataContainerView getPersistentDataContainer();
+    io.papermc.paper.persistence.PersistentDataContainerView getPersistentDataContainer();
     // Paper end - add pdc to offline player
 }

paper-api/src/main/java/org/bukkit/Particle.java

@@ -146,12 +146,10 @@ public enum Particle implements Keyed {
     /**
      * Uses {@link BlockData} as DataType
      */
-    @ApiStatus.Experimental
     BLOCK_CRUMBLE("block_crumble", BlockData.class),
     /**
      * Uses {@link Trail} as DataType
      */
-    @ApiStatus.Experimental
     TRAIL("trail", Trail.class),
     OMINOUS_SPAWNING("ominous_spawning"),
     RAID_OMEN("raid_omen"),
@@ -276,7 +274,6 @@ public enum Particle implements Keyed {
     /**
      * Options which can be applied to trail particles - a location, color and duration.
      */
-    @ApiStatus.Experimental
     public static class Trail {
 
         private final Location target;

paper-api/src/main/java/org/bukkit/Registry.java

@@ -3,6 +3,7 @@ package org.bukkit;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Predicates;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Iterables;
 import io.papermc.paper.datacomponent.DataComponentType;
 import io.papermc.paper.registry.RegistryAccess;
 import io.papermc.paper.registry.RegistryKey;
@@ -63,7 +64,7 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
     @SuppressWarnings("removal")
     @Deprecated(forRemoval = true, since = "1.21.4")
     private static <A extends Keyed> Registry<A> legacyRegistryFor(final Class<A> clazz) {
-        return Objects.requireNonNull(RegistryAccess.registryAccess().getRegistry(clazz), "No registry present for " + clazz.getSimpleName() + ". This is a bug.");
+        return Objects.requireNonNull(RegistryAccess.registryAccess().getRegistry(clazz), () -> "No registry present for " + clazz.getSimpleName() + ". This is a bug.");
     }
 
     /**
@@ -271,7 +272,6 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
      * @see JukeboxSong
      * @deprecated use {@link RegistryAccess#getRegistry(RegistryKey)} with {@link RegistryKey#JUKEBOX_SONG}
      */
-    @ApiStatus.Experimental
     @Deprecated(since = "1.21")
     Registry<JukeboxSong> JUKEBOX_SONG = legacyRegistryFor(JukeboxSong.class);
     /**
@@ -298,6 +298,11 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
             return MemoryKey.values().iterator();
         }
 
+        @Override
+        public int size() {
+            return MemoryKey.values().size();
+        }
+
         @Override
         public @Nullable MemoryKey get(final NamespacedKey key) {
             return MemoryKey.getByKey(key);
@@ -537,6 +542,13 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
         return (namespacedKey != null) ? this.get(namespacedKey) : null;
     }
 
+    /**
+     * Gets the size of the registry.
+     *
+     * @return the size of the registry
+     */
+    int size();
+
     @ApiStatus.Internal
     class SimpleRegistry<T extends Enum<T> & Keyed> extends NotARegistry<T> { // Paper - remove final
 
@@ -565,6 +577,11 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
             return this.map.get(key);
         }
 
+        @Override
+        public int size() {
+            return map.size();
+        }
+
         @Override
         public Iterator<T> iterator() {
             return this.map.values().iterator();
@@ -585,6 +602,11 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
             return StreamSupport.stream(this.spliterator(), false);
         }
 
+        @Override
+        public int size() {
+            return Iterables.size(this);
+        }
+
         @Override
         public NamespacedKey getKey(final A value) {
             return value.getKey();

paper-api/src/main/java/org/bukkit/Server.java

@@ -14,6 +14,9 @@ import java.util.Set;
 import java.util.UUID;
 import java.util.function.Consumer;
 import java.util.logging.Logger;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.tag.resolver.TagResolver;
 import org.bukkit.Warning.WarningState;
 import org.bukkit.advancement.Advancement;
 import org.bukkit.block.data.BlockData;
@@ -40,6 +43,7 @@ import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.inventory.ItemCraftResult;
 import org.bukkit.inventory.ItemFactory;
 import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.MenuType;
 import org.bukkit.inventory.Merchant;
 import org.bukkit.inventory.Recipe;
 import org.bukkit.inventory.meta.ItemMeta;
@@ -409,6 +413,40 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     }
     // Paper end
 
+    /**
+     * Sends a message with the MiniMessage format to the server.
+     * <p>
+     * See <a href="https://docs.advntr.dev/minimessage/">MiniMessage docs</a>
+     * for more information on the format.
+     *
+     * @param message MiniMessage content
+     */
+    default void sendRichMessage(final @NotNull String message) {
+        this.sendMessage(MiniMessage.miniMessage().deserialize(message, this));
+    }
+
+    /**
+     * Sends a message with the MiniMessage format to the server.
+     * <p>
+     * See <a href="https://docs.advntr.dev/minimessage/">MiniMessage docs</a> and <a href="https://docs.advntr.dev/minimessage/dynamic-replacements">MiniMessage Placeholders docs</a>
+     * for more information on the format.
+     *
+     * @param message MiniMessage content
+     * @param resolvers resolvers to use
+     */
+    default void sendRichMessage(final @NotNull String message, final @NotNull TagResolver... resolvers) {
+        this.sendMessage(MiniMessage.miniMessage().deserialize(message, this, resolvers));
+    }
+
+    /**
+     * Sends a plain message to the server.
+     *
+     * @param message plain message
+     */
+    default void sendPlainMessage(final @NotNull String message) {
+        this.sendMessage(Component.text(message));
+    }
+
     /**
      * Gets the name of the update folder. The update folder is used to safely
      * update plugins at the right moment on a plugin load.
@@ -950,26 +988,24 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     public boolean dispatchCommand(@NotNull CommandSender sender, @NotNull String commandLine) throws CommandException;
 
     /**
-     * Adds a recipe to the crafting manager. Recipes added with
-     * this method won't be sent to the client automatically. Use
-     * {@link #updateRecipes()} or {@link #updateResources()} to
-     * update clients to new recipes added.
+     * Adds a recipe to the crafting manager.
+     * Recipes added with this method won't be sent to the client automatically.
      * <p>
-     * Player's still have to discover recipes via {@link Player#discoverRecipe(NamespacedKey)}
+     * Players still have to discover recipes via {@link Player#discoverRecipe(NamespacedKey)}
      * before seeing them in their recipe book.
      *
      * @param recipe the recipe to add
-     * @return true if the recipe was added, false if it wasn't for some
-     *     reason
+     * @return true if the recipe was added, false if it wasn't for some reason
      * @see #addRecipe(Recipe, boolean)
      */
     @Contract("null -> false")
-    public boolean addRecipe(@Nullable Recipe recipe);
+    boolean addRecipe(@Nullable Recipe recipe);
 
     // Paper start - method to send recipes immediately
     /**
      * Adds a recipe to the crafting manager.
      *
+     * @apiNote resendRecipes is ignored for now for stability reasons, recipes will always be updated
      * @param recipe the recipe to add
      * @param resendRecipes true to update the client with the full set of recipes
      * @return true if the recipe was added, false if it wasn't for some reason
@@ -1181,7 +1217,11 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * Sets the radius, in blocks, around each worlds spawn point to protect.
      *
      * @param value new spawn radius, or 0 if none
+     * @deprecated has not functioned for a long time as the spawn radius is defined by the server.properties file.
+     * There is no API replacement for this method. It is generally recommended to implement "protection"-like behaviour
+     * via events or third-party plugin APIs.
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     public void setSpawnRadius(int value);
 
     /**
@@ -1191,8 +1231,10 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * @return true if the server should send a preview, false otherwise
      * @deprecated chat previews have been removed
      */
-    @Deprecated(since = "1.19.3")
-    public boolean shouldSendChatPreviews();
+    @Deprecated(since = "1.19.3", forRemoval = true)
+    default boolean shouldSendChatPreviews() {
+        return false;
+    }
 
     /**
      * Gets whether the server only allow players with Mojang-signed public key
@@ -1528,11 +1570,11 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * <br>
      * {@link InventoryType#WORKBENCH} will not process crafting recipes if
      * created with this method. Use
-     * {@link Player#openWorkbench(Location, boolean)} instead.
+     * {@link MenuType#CRAFTING} instead.
      * <br>
      * {@link InventoryType#ENCHANTING} will not process {@link ItemStack}s
      * for possible enchanting results. Use
-     * {@link Player#openEnchanting(Location, boolean)} instead.
+     * {@link MenuType#ENCHANTMENT} instead.
      *
      * @param owner the holder of the inventory, or null to indicate no holder
      * @param type the type of inventory to create
@@ -1555,11 +1597,11 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * <br>
      * {@link InventoryType#WORKBENCH} will not process crafting recipes if
      * created with this method. Use
-     * {@link Player#openWorkbench(Location, boolean)} instead.
+     * {@link MenuType#CRAFTING} instead.
      * <br>
      * {@link InventoryType#ENCHANTING} will not process {@link ItemStack}s
      * for possible enchanting results. Use
-     * {@link Player#openEnchanting(Location, boolean)} instead.
+     * {@link MenuType#ENCHANTMENT} instead.
      *
      * @param owner The holder of the inventory; can be null if there's no holder.
      * @param type The type of inventory to create.
@@ -1583,11 +1625,11 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * <br>
      * {@link InventoryType#WORKBENCH} will not process crafting recipes if
      * created with this method. Use
-     * {@link Player#openWorkbench(Location, boolean)} instead.
+     * {@link MenuType#CRAFTING} instead.
      * <br>
      * {@link InventoryType#ENCHANTING} will not process {@link ItemStack}s
      * for possible enchanting results. Use
-     * {@link Player#openEnchanting(Location, boolean)} instead.
+     * {@link MenuType#ENCHANTMENT} instead.
      *
      * @param owner The holder of the inventory; can be null if there's no holder.
      * @param type The type of inventory to create.
@@ -1654,7 +1696,10 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * @param title the title of the corresponding merchant inventory, displayed
      * when the merchant inventory is viewed
      * @return a new merchant
+     * @deprecated The title parameter is no-longer needed when used with
+     * {@link MenuType#MERCHANT} and {@link MenuType.Typed#builder()}.
      */
+    @Deprecated(since = "1.21.4")
     @NotNull Merchant createMerchant(net.kyori.adventure.text.@Nullable Component title);
     // Paper start
     /**
@@ -1663,7 +1708,8 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      * @param title the title of the corresponding merchant inventory, displayed
      * when the merchant inventory is viewed
      * @return a new merchant
-     * @deprecated in favour of {@link #createMerchant(net.kyori.adventure.text.Component)}
+     * @deprecated in favour of {@link #createMerchant(net.kyori.adventure.text.Component)}, The title parameter is
+     * no-longer needed when used with {@link MenuType#MERCHANT} and {@link MenuType.Typed#builder()}.
      */
     @NotNull
     @Deprecated // Paper
@@ -1678,6 +1724,14 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      */
     int getMaxChainedNeighborUpdates();
 
+    /**
+     * Creates an empty merchant.
+     *
+     * @return a new merchant
+     */
+    @NotNull
+    Merchant createMerchant();
+
     /**
      * Gets user-specified limit for number of monsters that can spawn in a
      * chunk.
@@ -2255,24 +2309,52 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     // Spigot start
     public class Spigot {
 
+        /**
+         * @deprecated Server config options may be renamed or removed without notice. Prefer using existing API
+         *  wherever possible, rather than directly reading from a server config.
+         *
+         * @return The server's spigot config.
+         */
+        @Deprecated(since = "1.21.4", forRemoval = true)
         @NotNull
         public org.bukkit.configuration.file.YamlConfiguration getConfig() {
             throw new UnsupportedOperationException("Not supported yet.");
         }
 
+        /**
+         * @deprecated Server config options may be renamed or removed without notice. Prefer using existing API
+         *  wherever possible, rather than directly reading from a server config.
+         *
+         * @return The server's bukkit config.
+         */
         // Paper start
+        @Deprecated(since = "1.21.4", forRemoval = true)
         @NotNull
         public org.bukkit.configuration.file.YamlConfiguration getBukkitConfig()
         {
             throw new UnsupportedOperationException( "Not supported yet." );
         }
 
+        /**
+         * @deprecated Server config options may be renamed or removed without notice. Prefer using existing API
+         *  wherever possible, rather than directly reading from a server config.
+         *
+         * @return The server's spigot config.
+         */
+        @Deprecated(since = "1.21.4", forRemoval = true)
         @NotNull
         public org.bukkit.configuration.file.YamlConfiguration getSpigotConfig()
         {
             throw new UnsupportedOperationException("Not supported yet.");
         }
 
+        /**
+         * @deprecated Server config options may be renamed or removed without notice. Prefer using existing API
+         *  wherever possible, rather than directly reading from a server config.
+         *
+         * @return The server's paper config.
+         */
+        @Deprecated(since = "1.21.4", forRemoval = true)
         @NotNull
         public org.bukkit.configuration.file.YamlConfiguration getPaperConfig()
         {
@@ -2304,16 +2386,28 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
 
         /**
          * Restart the server. If the server administrator has not configured restarting, the server will stop.
+         *
+         * @deprecated Use {@link Server#restart()} instead.
          */
+        @Deprecated(since = "1.21.4", forRemoval = true)
         public void restart() {
             throw new UnsupportedOperationException("Not supported yet.");
         }
     }
 
+    /**
+     * @deprecated All methods on this class have been deprecated, see the individual methods for replacements.
+     */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     @NotNull
     Spigot spigot();
     // Spigot end
 
+    /**
+     * Restarts the server. If the server administrator has not configured restarting, the server will stop.
+     */
+    void restart();
+
     void reloadPermissions(); // Paper
 
     boolean reloadCommandAliases(); // Paper

paper-api/src/main/java/org/bukkit/Sound.java

@@ -2,6 +2,7 @@ package org.bukkit;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryKey;
 import java.util.Locale;
 import org.bukkit.packs.DataPack;
 import org.bukkit.util.OldEnum;
@@ -1687,7 +1688,7 @@ public interface Sound extends OldEnum<Sound>, Keyed, net.kyori.adventure.sound.
     @NotNull
     @Deprecated(since = "1.21.3")
     static Sound valueOf(@NotNull String name) {
-        Sound sound = Bukkit.getUnsafe().get(Registry.SOUNDS, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        Sound sound = Bukkit.getUnsafe().get(RegistryKey.SOUND_EVENT, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
         if (sound != null) {
             return sound;
         }

paper-api/src/main/java/org/bukkit/UnsafeValues.java

@@ -2,12 +2,12 @@ package org.bukkit;
 
 import com.google.common.collect.Multimap;
 import io.papermc.paper.entity.EntitySerializationFlag;
+import io.papermc.paper.registry.RegistryKey;
 import org.bukkit.advancement.Advancement;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeModifier;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
-import org.bukkit.damage.DamageEffect;
 import org.bukkit.damage.DamageSource;
 import org.bukkit.damage.DamageType;
 import org.bukkit.entity.Entity;
@@ -140,7 +140,7 @@ public interface UnsafeValues {
     String get(Class<?> aClass, String value);
 
     @ApiStatus.Internal
-    <B extends Keyed> B get(Registry<B> registry, NamespacedKey key);
+    <B extends Keyed> B get(RegistryKey<B> registry, NamespacedKey key);
 
     @ApiStatus.Internal
     Biome getCustomBiome();
@@ -358,14 +358,17 @@ public interface UnsafeValues {
     // Paper start - spawn egg color visibility
     /**
      * Obtains the underlying color informating for a spawn egg of a given
-     * entity type, or null if the entity passed does not have a spawn egg.
+     * entity type, or {@code null} if the entity passed does not have a spawn egg.
      * Spawn eggs have two colors - the background layer (0), and the
      * foreground layer (1)
-     * @param entityType The entity type to get the color for
-     * @param layer The texture layer to get a color for
-     * @return The color of the layer for the entity's spawn egg
+     *
+     * @param entityType the entity type to get the color for
+     * @param layer the texture layer to get a color for
+     * @return the color of the layer for the entity's spawn egg
+     * @deprecated the color is no longer available to the server
      */
-    @Nullable org.bukkit.Color getSpawnEggLayerColor(org.bukkit.entity.EntityType entityType, int layer);
+    @Deprecated(since = "1.21.4")
+    @Nullable Color getSpawnEggLayerColor(EntityType entityType, int layer);
     // Paper end - spawn egg color visibility
 
     // Paper start - lifecycle event API

paper-api/src/main/java/org/bukkit/World.java

@@ -1,8 +1,7 @@
 package org.bukkit;
 
+import io.papermc.paper.raytracing.PositionedRayTraceConfigurationBuilder;
 import java.io.File;
-import org.bukkit.generator.ChunkGenerator;
-
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -475,12 +474,15 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * @param z Z-coordinate of the chunk
      * @return Whether the chunk was actually regenerated
      *
+     * @throws UnsupportedOperationException not implemented
      * @deprecated regenerating a single chunk is not likely to produce the same
      * chunk as before as terrain decoration may be spread across chunks. It may
      * or may not change blocks in the adjacent chunks as well.
      */
-    @Deprecated(since = "1.13")
-    public boolean regenerateChunk(int x, int z);
+    @Deprecated(since = "1.13", forRemoval = true)
+    default boolean regenerateChunk(int x, int z) {
+        throw new UnsupportedOperationException("Not supported in this Minecraft version! This is not a bug.");
+    }
 
     /**
      * Resends the {@link Chunk} to all clients
@@ -490,7 +492,6 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * @return Whether the chunk was actually refreshed
      *
      */
-    // @Deprecated(since = "1.8") // Paper
     public boolean refreshChunk(int x, int z);
 
     /**
@@ -1119,8 +1120,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * on the main Server Thread.
      *
      * @deprecated Use either the Future or the Consumer based methods
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @param cb Callback to receive the chunk when it is loaded.
      *           will be executed synchronously
      */
@@ -1188,8 +1189,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The {@link java.util.function.Consumer} will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @param cb Callback to receive the chunk when it is loaded.
      *           will be executed synchronously
      */
@@ -1210,8 +1211,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The {@link java.util.function.Consumer} will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @param gen Should we generate a chunk if it doesn't exist or not
      * @param cb Callback to receive the chunk when it is loaded.
      *           will be executed synchronously
@@ -1233,8 +1234,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The {@link java.util.function.Consumer} will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @param gen Should we generate a chunk if it doesn't exist or not
      * @param urgent If true, the chunk may be prioritised to be loaded above other chunks in queue
      * @param cb Callback to receive the chunk when it is loaded.
@@ -1256,10 +1257,10 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The {@link Runnable} will always be executed synchronously
      * on the main Server Thread, and when invoked all chunks requested will be loaded.
      *
-     * @param minX Minimum chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param minZ Minimum chunk Z-coordinate of the chunk - floor(world coordinate / 16)
-     * @param maxX Maximum chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param maxZ Maximum chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param minX Minimum Chunk x-coordinate
+     * @param minZ Minimum Chunk z-coordinate
+     * @param maxX Maximum Chunk x-coordinate
+     * @param maxZ Maximum Chunk z-coordinate
      * @param urgent If true, the chunks may be prioritised to be loaded above other chunks in queue
      * @param cb Callback to invoke when all chunks are loaded.
      *           Will be executed synchronously
@@ -1445,8 +1446,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The future will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @return Future that will resolve when the chunk is loaded
      */
     default @NotNull java.util.concurrent.CompletableFuture<Chunk> getChunkAtAsync(final int x, final int z) {
@@ -1466,8 +1467,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * The future will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x Chunk X-coordinate of the chunk - floor(world coordinate / 16)
-     * @param z Chunk Z-coordinate of the chunk - floor(world coordinate / 16)
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @param gen Should we generate a chunk if it doesn't exist or not
      * @return Future that will resolve when the chunk is loaded
      */
@@ -1477,14 +1478,14 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
 
     /**
      * Requests a {@link Chunk} to be loaded at the given coordinates
-     *
+     * <p>
      * This method makes no guarantee on how fast the chunk will load,
      * and will return the chunk to the callback at a later time.
-     *
+     * <p>
      * You should use this method if you need a chunk but do not need it
-     * immediately, and you wish to let the server control the speed
-     * of chunk loads, keeping performance in mind.
-     *
+     * immediately, and you wish for it to be prioritised over other
+     * chunk loads in queue.
+     * <p>
      * The future will always be executed synchronously
      * on the main Server Thread.
      * @param loc Location to load the corresponding chunk from
@@ -1496,14 +1497,14 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
 
     /**
      * Requests a {@link Chunk} to be loaded at the given coordinates
-     *
+     * <p>
      * This method makes no guarantee on how fast the chunk will load,
      * and will return the chunk to the callback at a later time.
-     *
+     * <p>
      * You should use this method if you need a chunk but do not need it
-     * immediately, and you wish to let the server control the speed
-     * of chunk loads, keeping performance in mind.
-     *
+     * immediately, and you wish for it to be prioritised over other
+     * chunk loads in queue.
+     * <p>
      * The future will always be executed synchronously
      * on the main Server Thread.
      * @param loc Location to load the corresponding chunk from
@@ -1516,14 +1517,14 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
 
     /**
      * Requests a {@link Chunk} to be loaded at the given coordinates
-     *
+     * <p>
      * This method makes no guarantee on how fast the chunk will load,
      * and will return the chunk to the callback at a later time.
-     *
+     * <p>
      * You should use this method if you need a chunk but do not need it
-     * immediately, and you wish to let the server control the speed
-     * of chunk loads, keeping performance in mind.
-     *
+     * immediately, and you wish for it to be prioritised over other
+     * chunk loads in queue.
+     * <p>
      * The future will always be executed synchronously
      * on the main Server Thread.
      * @param block Block to load the corresponding chunk from
@@ -1535,14 +1536,14 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
 
     /**
      * Requests a {@link Chunk} to be loaded at the given coordinates
-     *
+     * <p>
      * This method makes no guarantee on how fast the chunk will load,
      * and will return the chunk to the callback at a later time.
-     *
+     * <p>
      * You should use this method if you need a chunk but do not need it
-     * immediately, and you wish to let the server control the speed
-     * of chunk loads, keeping performance in mind.
-     *
+     * immediately, and you wish for it to be prioritised over other
+     * chunk loads in queue.
+     * <p>
      * The future will always be executed synchronously
      * on the main Server Thread.
      * @param block Block to load the corresponding chunk from
@@ -1555,25 +1556,45 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
 
     /**
      * Requests a {@link Chunk} to be loaded at the given coordinates
-     *
+     * <p>
      * This method makes no guarantee on how fast the chunk will load,
-     * and will return the chunk to the callback at a later time.
-     *
+     * and will complete the future at a later time.
+     * <p>
      * You should use this method if you need a chunk but do not need it
-     * immediately, and you wish to let the server control the speed
-     * of chunk loads, keeping performance in mind.
-     *
+     * immediately, and you wish for it to be prioritised over other
+     * chunk loads in queue.
+     * <p>
      * The future will always be executed synchronously
      * on the main Server Thread.
      *
-     * @param x X Coord
-     * @param z Z Coord
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
      * @return Future that will resolve when the chunk is loaded
      */
     default @NotNull java.util.concurrent.CompletableFuture<Chunk> getChunkAtAsyncUrgently(final int x, final int z) {
         return this.getChunkAtAsync(x, z, true, true);
     }
 
+    /**
+     * Requests a {@link Chunk} to be loaded at the given coordinates.
+     * <p>
+     * This method makes no guarantee on how fast the chunk will load,
+     * and will return the chunk to the callback at a later time.
+     * <p>
+     * You should use this method if you need a chunk but do not need it
+     * immediately, and you wish to let the server control the speed
+     * of chunk loads, keeping performance in mind.
+     * <p>
+     * The future will always be executed synchronously
+     * on the main Server Thread.
+     *
+     * @param x Chunk x-coordinate
+     * @param z Chunk z-coordinate
+     * @param gen Should the chunk generate if it doesn't exist
+     * @param urgent If true, the chunk may be prioritised to be loaded above other chunks in queue
+     *
+     * @return Future that will resolve when the chunk is loaded
+     */
     default @NotNull java.util.concurrent.CompletableFuture<Chunk> getChunkAtAsync(int x, int z, boolean gen, boolean urgent) {
         java.util.concurrent.CompletableFuture<Chunk> ret = new java.util.concurrent.CompletableFuture<>();
         this.getChunkAtAsync(x, z, gen, urgent, ret::complete);
@@ -1938,6 +1959,20 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
     @Nullable RayTraceResult rayTrace(io.papermc.paper.math.@NotNull Position start, @NotNull Vector direction, double maxDistance, @NotNull FluidCollisionMode fluidCollisionMode, boolean ignorePassableBlocks, double raySize, @Nullable Predicate<? super Entity> filter, @Nullable Predicate<? super Block> canCollide);
     // Paper end
 
+    /**
+     * Performs a ray trace that checks for collisions with the specified
+     * targets.
+     * <p>
+     * This may cause loading of chunks! Some implementations may impose
+     * artificial restrictions on the maximum distance.
+     *
+     * @param builderConsumer a consumer to configure the ray trace configuration.
+     *     The received builder is not valid for use outside the consumer
+     * @return the closest ray trace hit result with either a block or an
+     *     entity, or <code>null</code> if there is no hit
+     */
+    @Nullable RayTraceResult rayTrace(@NotNull Consumer<PositionedRayTraceConfigurationBuilder> builderConsumer);
+
     /**
      * Gets the default spawn {@link Location} of this world
      *
@@ -2373,9 +2408,17 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
     public BiomeProvider getBiomeProvider();
 
     /**
-     * Saves world to disk
+     * Saves the world to disk
      */
-    public void save();
+    default void save() {
+        save(false);
+    }
+
+    /**
+     * Saves the world to disk
+     * @param flush Whether to wait for the chunk writer to finish
+     */
+    void save(boolean flush);
 
     /**
      * Gets a list of all applied {@link BlockPopulator}s for this World
@@ -2440,7 +2483,7 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * @deprecated Use {@link #spawn(Location, Class, Consumer)} (or a variation thereof) in combination with {@link FallingBlock#setBlockData(BlockData)}
      */
     @NotNull
-    @Deprecated(since = "1.20.2") // Paper
+    @Deprecated(since = "1.20.2", forRemoval = true)
     public FallingBlock spawnFallingBlock(@NotNull Location location, @NotNull MaterialData data) throws IllegalArgumentException;
 
     /**
@@ -2475,7 +2518,7 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      *     Material} are null or {@link Material} is not a block
      * @deprecated Magic value. Use {@link #spawn(Location, Class, Consumer)} (or a variation thereof) in combination with {@link FallingBlock#setBlockData(BlockData)}
      */
-    @Deprecated(since = "1.7.5")
+    @Deprecated(since = "1.7.5", forRemoval = true)
     @NotNull
     public FallingBlock spawnFallingBlock(@NotNull Location location, @NotNull Material material, byte data) throws IllegalArgumentException;
 
@@ -2593,9 +2636,6 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * <p>
      * It is safe to run this method when the block does not exist, it will
      * not create the block.
-     * <p>
-     * This method will return the raw temperature without adjusting for block
-     * height effects.
      *
      * @param x X coordinate of the block
      * @param z Z coordinate of the block
@@ -2610,9 +2650,6 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      * <p>
      * It is safe to run this method when the block does not exist, it will
      * not create the block.
-     * <p>
-     * This method will return the raw temperature without adjusting for block
-     * height effects.
      *
      * @param x X coordinate of the block
      * @param y Y coordinate of the block
@@ -2772,6 +2809,8 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      *
      * @param value true if the world should automatically save, otherwise
      *     false
+     * @apiNote This does not disable saving entirely, the world will still be saved on shutdown.<br>
+     * The intended use of this method is to disable the periodical autosave by the game.
      */
     public void setAutoSave(boolean value);
 

paper-api/src/main/java/org/bukkit/attribute/Attribute.java

@@ -2,6 +2,7 @@ package org.bukkit.attribute;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryKey;
 import java.util.Locale;
 import org.bukkit.Bukkit;
 import org.bukkit.Keyed;
@@ -158,7 +159,7 @@ public interface Attribute extends OldEnum<Attribute>, Keyed, Translatable, net.
     @NotNull
     @Deprecated(since = "1.21.3", forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.22") // Paper - will be removed via asm-utils
     static Attribute valueOf(@NotNull String name) {
-        Attribute attribute = Bukkit.getUnsafe().get(Registry.ATTRIBUTE, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        Attribute attribute = Bukkit.getUnsafe().get(RegistryKey.ATTRIBUTE, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
         Preconditions.checkArgument(attribute != null, "No attribute found with the name %s", name);
         return attribute;
     }

paper-api/src/main/java/org/bukkit/block/Biome.java

@@ -2,13 +2,14 @@ package org.bukkit.block;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
 import java.util.Locale;
 import org.bukkit.Bukkit;
 import org.bukkit.FeatureFlag;
 import org.bukkit.Keyed;
 import org.bukkit.NamespacedKey;
 import org.bukkit.Registry;
-import org.bukkit.packs.DataPack;
 import org.bukkit.util.OldEnum;
 import org.jetbrains.annotations.NotNull;
 
@@ -17,8 +18,8 @@ import org.jetbrains.annotations.NotNull;
  * <p>
  * The Biomes listed in this interface are present in the default server
  * or can be enabled via a {@link FeatureFlag}.
- * There may be additional biomes present in the server, for example from a {@link DataPack}
- * which can be accessed via {@link Registry#BIOME}.
+ * There may be additional biomes present in the server, for example from a {@link io.papermc.paper.datapack.Datapack}
+ * which can be accessed via {@link io.papermc.paper.registry.RegistryAccess#getRegistry(RegistryKey)} and {@link RegistryKey#BIOME}.
  */
 public interface Biome extends OldEnum<Biome>, Keyed, net.kyori.adventure.translation.Translatable { // Paper - Adventure translations
 
@@ -98,7 +99,7 @@ public interface Biome extends OldEnum<Biome>, Keyed, net.kyori.adventure.transl
 
     @NotNull
     private static Biome getBiome(@NotNull String key) {
-        return Registry.BIOME.getOrThrow(NamespacedKey.minecraft(key));
+        return RegistryAccess.registryAccess().getRegistry(RegistryKey.BIOME).getOrThrow(NamespacedKey.minecraft(key));
     }
 
     /**
@@ -113,7 +114,7 @@ public interface Biome extends OldEnum<Biome>, Keyed, net.kyori.adventure.transl
             return Biome.CUSTOM;
         }
 
-        Biome biome = Bukkit.getUnsafe().get(Registry.BIOME, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
+        Biome biome = Bukkit.getUnsafe().get(RegistryKey.BIOME, NamespacedKey.fromString(name.toLowerCase(Locale.ROOT)));
         Preconditions.checkArgument(biome != null, "No biome found with the name %s", name);
         return biome;
     }

paper-api/src/main/java/org/bukkit/block/Block.java

@@ -40,7 +40,7 @@ public interface Block extends Metadatable, Translatable, net.kyori.adventure.tr
      * @return block specific metadata
      * @deprecated Magic value
      */
-    @Deprecated(since = "1.6.2")
+    @Deprecated(since = "1.6.2", forRemoval = true)
     byte getData();
 
     /**
@@ -509,9 +509,6 @@ public interface Block extends Metadatable, Translatable, net.kyori.adventure.tr
 
     /**
      * Gets the temperature of this block.
-     * <p>
-     * If the raw biome temperature without adjusting for height effects is
-     * required then please use {@link World#getTemperature(int, int, int)}.
      *
      * @return Temperature of this block
      */