[ci skip] use more jspecify in server

patches/server/Add-RegistryAccess-for-managing-Registries.patch

@@ -81,14 +81,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.inventory.meta.trim.TrimPattern;
 +import org.bukkit.map.MapCursor;
 +import org.bukkit.potion.PotionEffectType;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.Nullable;
 +
 +import static io.papermc.paper.registry.entry.RegistryEntry.apiOnly;
 +import static io.papermc.paper.registry.entry.RegistryEntry.entry;
 +
-+@DefaultQualifier(NonNull.class)
 +public final class PaperRegistries {
 +
 +    static final List<RegistryEntry<?, ?>> REGISTRY_ENTRIES;
@@ -194,14 +191,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.resources.ResourceKey;
 +import org.bukkit.Keyed;
 +import org.bukkit.Registry;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +import org.jetbrains.annotations.VisibleForTesting;
++import org.jspecify.annotations.Nullable;
 +
-+import static java.util.Objects.requireNonNull;
-+
-+@DefaultQualifier(NonNull.class)
 +public class PaperRegistryAccess implements RegistryAccess {
 +
 +    // We store the API registries in a memoized supplier, so they can be created on-demand.
@@ -224,14 +216,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    @Deprecated(forRemoval = true)
 +    @Override
 +    public <T extends Keyed> @Nullable Registry<T> getRegistry(final Class<T> type) {
-+        final @Nullable RegistryKey<T> registryKey = byType(type);
++        final RegistryKey<T> registryKey = byType(type);
 +        // If our mapping from Class -> RegistryKey did not contain the passed type it was either a completely invalid type or a registry
 +        // that merely exists as a SimpleRegistry in the org.bukkit.Registry type. We cannot return a registry for these, return null
 +        // as per method contract in Bukkit#getRegistry.
 +        if (registryKey == null) return null;
 +
-+        final @Nullable RegistryEntry<?, T> entry = PaperRegistries.getEntry(registryKey);
-+        final @Nullable RegistryHolder<T> registry = (RegistryHolder<T>) this.registries.get(registryKey);
++        final RegistryEntry<?, T> entry = PaperRegistries.getEntry(registryKey);
++        final RegistryHolder<T> registry = (RegistryHolder<T>) this.registries.get(registryKey);
 +        if (registry != null) {
 +            // if the registry exists, return right away. Since this is the "legacy" method, we return DelayedRegistry
 +            // for the non-builtin Registry instances stored as fields in Registry.
@@ -364,10 +356,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import java.util.function.Supplier;
 +import org.bukkit.Keyed;
 +import org.bukkit.Registry;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +
-+@DefaultQualifier(NonNull.class)
 +public interface RegistryHolder<B extends Keyed> {
 +
 +    Registry<B> get();
@@ -487,10 +476,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.NamespacedKey;
 +import org.bukkit.craftbukkit.CraftRegistry;
 +import org.bukkit.craftbukkit.util.ApiVersion;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +
-+@DefaultQualifier(NonNull.class)
 +public class CraftRegistryEntry<M, B extends Keyed> extends BaseRegistryEntry<M, B> { // TODO remove Keyed
 +
 +    private static final BiFunction<NamespacedKey, ApiVersion, NamespacedKey> EMPTY = (namespacedKey, apiVersion) -> namespacedKey;
@@ -544,10 +530,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.Keyed;
 +import org.bukkit.NamespacedKey;
 +import org.bukkit.craftbukkit.util.ApiVersion;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +
-+@DefaultQualifier(NonNull.class)
 +public interface RegistryEntry<M, B extends Keyed> extends RegistryEntryInfo<M, B> { // TODO remove Keyed
 +
 +    RegistryHolder<B> createRegistryHolder(Registry<M> nmsRegistry);
@@ -607,11 +590,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/registry/entry/package-info.java
 @@ -0,0 +0,0 @@
-+@DefaultQualifier(NonNull.class)
++@NullMarked
 +package io.papermc.paper.registry.entry;
 +
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java b/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -623,14 +605,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import java.util.Iterator;
 +import java.util.function.Supplier;
 +import java.util.stream.Stream;
-+import net.kyori.adventure.key.Key;
 +import org.bukkit.Keyed;
 +import org.bukkit.NamespacedKey;
 +import org.bukkit.Registry;
-+import org.bukkit.craftbukkit.CraftRegistry;
-+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * This is to support the now-deprecated fields in {@link Registry} for
@@ -638,7 +616,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + */
 +public final class DelayedRegistry<T extends Keyed, R extends Registry<T>> implements Registry<T> {
 +
-+    private @MonotonicNonNull Supplier<? extends R> delegate;
++    private @Nullable Supplier<? extends R> delegate;
 +
 +    public void load(final Supplier<? extends R> registry) {
 +        if (this.delegate != null) {
@@ -660,7 +638,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public @NotNull T getOrThrow(@NotNull final NamespacedKey key) {
++    public T getOrThrow(final NamespacedKey key) {
 +        return this.delegate().getOrThrow(key);
 +    }
 +
@@ -675,7 +653,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public NamespacedKey getKey(final T value) {
++    public @Nullable NamespacedKey getKey(final T value) {
 +        return this.delegate().getKey(value);
 +    }
 +}
@@ -756,11 +734,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/registry/legacy/package-info.java
 @@ -0,0 +0,0 @@
-+@DefaultQualifier(NonNull.class)
++@NullMarked
 +package io.papermc.paper.registry.legacy;
 +
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.NullMarked;
+diff --git a/src/main/java/io/papermc/paper/registry/package-info.java b/src/main/java/io/papermc/paper/registry/package-info.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/registry/package-info.java
+@@ -0,0 +0,0 @@
++@NullMarked
++package io.papermc.paper.registry;
++
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/net/minecraft/core/registries/BuiltInRegistries.java b/src/main/java/net/minecraft/core/registries/BuiltInRegistries.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/core/registries/BuiltInRegistries.java

patches/server/Add-registry-entry-and-builders.patch

@@ -72,31 +72,27 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.world.item.enchantment.Enchantment;
 +import org.bukkit.craftbukkit.CraftEquipmentSlot;
 +import org.bukkit.inventory.ItemType;
-+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.Nullable;
 +
 +import static io.papermc.paper.registry.data.util.Checks.asArgument;
 +import static io.papermc.paper.registry.data.util.Checks.asArgumentMin;
 +import static io.papermc.paper.registry.data.util.Checks.asConfigured;
 +
-+@DefaultQualifier(NonNull.class)
 +public class PaperEnchantmentRegistryEntry implements EnchantmentRegistryEntry {
 +
 +    // Top level
-+    protected @MonotonicNonNull Component description;
++    protected @Nullable Component description;
 +
 +    // Definition
-+    protected @MonotonicNonNull HolderSet<Item> supportedItems;
++    protected @Nullable HolderSet<Item> supportedItems;
 +    protected @Nullable HolderSet<Item> primaryItems;
 +    protected OptionalInt weight = OptionalInt.empty();
 +    protected OptionalInt maxLevel = OptionalInt.empty();
-+    protected Enchantment.@MonotonicNonNull Cost minimumCost;
-+    protected Enchantment.@MonotonicNonNull Cost maximumCost;
++    protected Enchantment.@Nullable Cost minimumCost;
++    protected Enchantment.@Nullable Cost maximumCost;
 +    protected OptionalInt anvilCost = OptionalInt.empty();
-+    protected @MonotonicNonNull List<EquipmentSlotGroup> activeSlots;
++    protected @Nullable List<EquipmentSlotGroup> activeSlots;
 +
 +    // Exclusive
 +    protected HolderSet<Enchantment> exclusiveWith = HolderSet.empty(); // Paper added default to empty.
@@ -165,13 +161,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    @Override
 +    public EnchantmentCost minimumCost() {
-+        final Enchantment.@MonotonicNonNull Cost cost = asConfigured(this.minimumCost, "minimumCost");
++        final Enchantment.Cost cost = asConfigured(this.minimumCost, "minimumCost");
 +        return EnchantmentRegistryEntry.EnchantmentCost.of(cost.base(), cost.perLevelAboveFirst());
 +    }
 +
 +    @Override
 +    public EnchantmentCost maximumCost() {
-+        final Enchantment.@MonotonicNonNull Cost cost = asConfigured(this.maximumCost, "maximumCost");
++        final Enchantment.Cost cost = asConfigured(this.maximumCost, "maximumCost");
 +        return EnchantmentRegistryEntry.EnchantmentCost.of(cost.base(), cost.perLevelAboveFirst());
 +    }
 +
@@ -293,15 +289,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import io.papermc.paper.registry.data.util.Conversions;
 +import java.util.OptionalInt;
 +import net.minecraft.world.level.gameevent.GameEvent;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.Nullable;
 +
 +import static io.papermc.paper.registry.data.util.Checks.asArgumentMin;
 +import static io.papermc.paper.registry.data.util.Checks.asConfigured;
 +
-+@DefaultQualifier(NonNull.class)
 +public class PaperGameEventRegistryEntry implements GameEventRegistryEntry {
 +
 +    protected OptionalInt range = OptionalInt.empty();
@@ -470,6 +463,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        }
 +    }
 +}
+diff --git a/src/main/java/io/papermc/paper/registry/data/package-info.java b/src/main/java/io/papermc/paper/registry/data/package-info.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/registry/data/package-info.java
+@@ -0,0 +0,0 @@
++@NullMarked
++package io.papermc.paper.registry.data;
++
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/io/papermc/paper/registry/data/util/Checks.java b/src/main/java/io/papermc/paper/registry/data/util/Checks.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -479,11 +482,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package io.papermc.paper.registry.data.util;
 +
 +import java.util.OptionalInt;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.Nullable;
 +
-+@DefaultQualifier(NonNull.class)
 +public final class Checks {
 +
 +    public static <T> T asConfigured(final @Nullable T value, final String field) {

patches/server/Registry-Modification-API.patch

@@ -22,14 +22,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  import java.util.Collections;
  import java.util.IdentityHashMap;
  import java.util.List;
-@@ -0,0 +0,0 @@ import org.checkerframework.framework.qual.DefaultQualifier;
+@@ -0,0 +0,0 @@ import org.jspecify.annotations.Nullable;
  
  import static io.papermc.paper.registry.entry.RegistryEntry.apiOnly;
  import static io.papermc.paper.registry.entry.RegistryEntry.entry;
 +import static io.papermc.paper.registry.entry.RegistryEntry.writable;
  
- @DefaultQualifier(NonNull.class)
  public final class PaperRegistries {
+ 
 @@ -0,0 +0,0 @@ public final class PaperRegistries {
          return ResourceKey.create((ResourceKey<? extends Registry<M>>) PaperRegistries.registryToNms(typedKey.registryKey()), PaperAdventure.asVanilla(typedKey.key()));
      }
@@ -74,8 +74,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package io.papermc.paper.registry;
 +
 +import io.papermc.paper.registry.data.util.Conversions;
-+import net.minecraft.resources.RegistryOps;
-+import org.checkerframework.checker.nullness.qual.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +public interface PaperRegistryBuilder<M, T> extends RegistryBuilder<T> {
 +
@@ -133,8 +132,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.core.registries.BuiltInRegistries;
 +import net.minecraft.resources.ResourceKey;
 +import net.minecraft.resources.ResourceLocation;
-+import org.checkerframework.checker.nullness.qual.Nullable;
 +import org.intellij.lang.annotations.Subst;
++import org.jspecify.annotations.Nullable;
 +
 +public class PaperRegistryListenerManager {
 +
@@ -201,7 +200,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        final Conversions conversions
 +    ) {
 +        Preconditions.checkState(LaunchEntryPointHandler.INSTANCE.hasEntered(Entrypoint.BOOTSTRAPPER), registry.key() + " tried to run modification listeners before bootstrappers have been called"); // verify that bootstrappers have been called
-+        final @Nullable RegistryEntryInfo<M, T> entry = PaperRegistries.getEntry(registry.key());
++        final RegistryEntryInfo<M, T> entry = PaperRegistries.getEntry(registry.key());
 +        if (!RegistryEntry.Modifiable.isModifiable(entry) || !this.valueAddEventTypes.hasHandlers(entry.apiKey())) {
 +            return registerMethod.register((WritableRegistry<M>) registry, key, nms, registrationInfo);
 +        }
@@ -262,7 +261,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    public <M, T extends org.bukkit.Keyed, B extends PaperRegistryBuilder<M, T>> void runFreezeListeners(final ResourceKey<? extends Registry<M>> resourceKey, final Conversions conversions) {
-+        final @Nullable RegistryEntryInfo<M, T> entry = PaperRegistries.getEntry(resourceKey);
++        final RegistryEntryInfo<M, T> entry = PaperRegistries.getEntry(resourceKey);
 +        if (!RegistryEntry.Addable.isAddable(entry) || !this.freezeEventTypes.hasHandlers(entry.apiKey())) {
 +            return;
 +        }
@@ -341,7 +340,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.NamespacedKey;
 +import org.bukkit.craftbukkit.CraftRegistry;
 +import org.bukkit.craftbukkit.util.ApiVersion;
-+import org.checkerframework.checker.nullness.qual.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +public class WritableCraftRegistry<M, T extends Keyed, B extends PaperRegistryBuilder<M, T>> extends CraftRegistry<T, M> {
 +
@@ -428,12 +427,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import io.papermc.paper.adventure.WrapperAwareSerializer;
 +import net.kyori.adventure.text.Component;
 +import net.minecraft.resources.RegistryOps;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +import org.jetbrains.annotations.Contract;
++import org.jspecify.annotations.Nullable;
 +
-+@DefaultQualifier(NonNull.class)
 +public class Conversions {
 +
 +    private final RegistryOps.RegistryInfoLookup lookup;
@@ -458,6 +454,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return vanilla == null ? Component.empty() : this.serializer.deserialize(vanilla);
 +    }
 +}
+diff --git a/src/main/java/io/papermc/paper/registry/data/util/package-info.java b/src/main/java/io/papermc/paper/registry/data/util/package-info.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/registry/data/util/package-info.java
+@@ -0,0 +0,0 @@
++@NullMarked
++package io.papermc.paper.registry.data.util;
++
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/io/papermc/paper/registry/entry/AddableRegistryEntry.java b/src/main/java/io/papermc/paper/registry/entry/AddableRegistryEntry.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -564,14 +570,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  import io.papermc.paper.registry.legacy.DelayedRegistryEntry;
  import java.util.function.BiFunction;
  import java.util.function.Supplier;
-@@ -0,0 +0,0 @@ import org.bukkit.Keyed;
+@@ -0,0 +0,0 @@ import net.minecraft.resources.ResourceKey;
+ import org.bukkit.Keyed;
  import org.bukkit.NamespacedKey;
  import org.bukkit.craftbukkit.util.ApiVersion;
- import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.checker.nullness.qual.Nullable;
- import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.Nullable;
+ 
+ public interface RegistryEntry<M, B extends Keyed> extends RegistryEntryInfo<M, B> { // TODO remove Keyed
  
- @DefaultQualifier(NonNull.class)
 @@ -0,0 +0,0 @@ public interface RegistryEntry<M, B extends Keyed> extends RegistryEntryInfo<M,
          return new DelayedRegistryEntry<>(this);
      }
@@ -711,7 +717,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.core.HolderSet;
 +import net.minecraft.resources.RegistryOps;
 +import org.bukkit.Keyed;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +
 +public record RegistryEntryAddEventImpl<T, B extends RegistryBuilder<T>>(
 +    TypedKey<T> key,
@@ -721,7 +726,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +) implements RegistryEntryAddEvent<T, B>, PaperLifecycleEvent {
 +
 +    @Override
-+    public @NonNull <V extends Keyed> Tag<V> getOrCreateTag(final TagKey<V> tagKey) {
++    public <V extends Keyed> Tag<V> getOrCreateTag(final TagKey<V> tagKey) {
 +        final RegistryOps.RegistryInfo<Object> registryInfo = this.conversions.lookup().lookup(PaperRegistries.registryToNms(tagKey.registryKey())).orElseThrow();
 +        final HolderSet.Named<?> tagSet = registryInfo.getter().getOrThrow(PaperRegistries.toNms(tagKey));
 +        return new NamedRegistryKeySetImpl<>(tagKey, tagSet);
@@ -827,7 +832,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.core.HolderSet;
 +import net.minecraft.resources.RegistryOps;
 +import org.bukkit.Keyed;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +
 +public record RegistryFreezeEventImpl<T, B extends RegistryBuilder<T>>(
 +    RegistryKey<T> registryKey,
@@ -836,7 +840,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +) implements RegistryFreezeEvent<T, B>, PaperLifecycleEvent {
 +
 +    @Override
-+    public @NonNull <V extends Keyed> Tag<V> getOrCreateTag(final TagKey<V> tagKey) {
++    public <V extends Keyed> Tag<V> getOrCreateTag(final TagKey<V> tagKey) {
 +        final RegistryOps.RegistryInfo<Object> registryInfo = this.conversions.lookup().lookup(PaperRegistries.registryToNms(tagKey.registryKey())).orElseThrow();
 +        final HolderSet.Named<?> tagSet = registryInfo.getter().getOrThrow(PaperRegistries.toNms(tagKey));
 +        return new NamedRegistryKeySetImpl<>(tagKey, tagSet);
@@ -848,11 +852,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/registry/event/package-info.java
 @@ -0,0 +0,0 @@
-+@DefaultQualifier(NonNull.class)
++@NullMarked
 +package io.papermc.paper.registry.event;
 +
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddEventTypeImpl.java b/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddEventTypeImpl.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -912,8 +915,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import io.papermc.paper.registry.TypedKey;
 +import io.papermc.paper.registry.event.RegistryEntryAddEvent;
 +import java.util.function.Predicate;
-+import org.checkerframework.checker.nullness.qual.Nullable;
 +import org.jetbrains.annotations.Contract;
++import org.jspecify.annotations.Nullable;
 +
 +public class RegistryEntryAddHandlerConfiguration<T, B extends RegistryBuilder<T>> extends PrioritizedLifecycleEventHandlerConfigurationImpl<BootstrapContext, RegistryEntryAddEvent<T, B>> implements RegistryEntryAddConfiguration<T> {
 +
@@ -968,6 +971,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return false; // only runs once
 +    }
 +}
+diff --git a/src/main/java/io/papermc/paper/registry/event/type/package-info.java b/src/main/java/io/papermc/paper/registry/event/type/package-info.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/registry/event/type/package-info.java
+@@ -0,0 +0,0 @@
++@NullMarked
++package io.papermc.paper.registry.event.type;
++
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java b/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java
@@ -980,16 +993,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  import java.util.Iterator;
  import java.util.function.Supplier;
  import java.util.stream.Stream;
-@@ -0,0 +0,0 @@ import net.kyori.adventure.key.Key;
- import org.bukkit.Keyed;
- import org.bukkit.NamespacedKey;
- import org.bukkit.Registry;
--import org.bukkit.craftbukkit.CraftRegistry;
- import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
- import org.checkerframework.checker.nullness.qual.Nullable;
- import org.jetbrains.annotations.NotNull;
 @@ -0,0 +0,0 @@ public final class DelayedRegistry<T extends Keyed, R extends Registry<T>> imple
-     public NamespacedKey getKey(final T value) {
+     public @Nullable NamespacedKey getKey(final T value) {
          return this.delegate().getKey(value);
      }
 +
@@ -1003,17 +1008,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.delegate().getTag(key);
 +    }
  }
-diff --git a/src/main/java/io/papermc/paper/registry/package-info.java b/src/main/java/io/papermc/paper/registry/package-info.java
-new file mode 100644
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
---- /dev/null
-+++ b/src/main/java/io/papermc/paper/registry/package-info.java
-@@ -0,0 +0,0 @@
-+@DefaultQualifier(NonNull.class)
-+package io.papermc.paper.registry;
-+
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 diff --git a/src/main/java/io/papermc/paper/registry/set/NamedRegistryKeySetImpl.java b/src/main/java/io/papermc/paper/registry/set/NamedRegistryKeySetImpl.java
 new file mode 100644
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
@@ -1039,12 +1033,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.NamespacedKey;
 +import org.bukkit.Registry;
 +import org.bukkit.craftbukkit.util.CraftNamespacedKey;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
-+import org.jetbrains.annotations.NotNull;
 +import org.jetbrains.annotations.Unmodifiable;
++import org.jspecify.annotations.NullMarked;
 +
-+@DefaultQualifier(NonNull.class)
++@NullMarked
 +public record NamedRegistryKeySetImpl<T extends Keyed, M>( // TODO remove Keyed
 +    TagKey<T> tagKey,
 +    HolderSet.Named<M> namedSet
@@ -1091,7 +1083,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public @NotNull NamespacedKey getKey() {
++    public NamespacedKey getKey() {
 +        final Key key = this.tagKey().key();
 +        return new NamespacedKey(key.namespace(), key.value());
 +    }
@@ -1115,10 +1107,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.resources.RegistryOps;
 +import net.minecraft.resources.ResourceKey;
 +import org.bukkit.Keyed;
-+import org.checkerframework.checker.nullness.qual.NonNull;
-+import org.checkerframework.framework.qual.DefaultQualifier;
 +
-+@DefaultQualifier(NonNull.class)
 +public final class PaperRegistrySets {
 +
 +    public static <A extends Keyed, M> HolderSet<M> convertToNms(final ResourceKey<? extends Registry<M>> resourceKey, final RegistryOps.RegistryInfoLookup lookup, final RegistryKeySet<A> registryKeySet) { // TODO remove Keyed
@@ -1150,6 +1139,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private PaperRegistrySets() {
 +    }
 +}
+diff --git a/src/main/java/io/papermc/paper/registry/set/package-info.java b/src/main/java/io/papermc/paper/registry/set/package-info.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/registry/set/package-info.java
+@@ -0,0 +0,0 @@
++@NullMarked
++package io.papermc.paper.registry.set;
++
++import org.jspecify.annotations.NullMarked;
 diff --git a/src/main/java/net/minecraft/core/MappedRegistry.java b/src/main/java/net/minecraft/core/MappedRegistry.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/core/MappedRegistry.java