Swap some nullable annotations (#9696)

patches/api/Add-EntityLoadCrossbowEvent.patch

@@ -13,26 +13,27 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package io.papermc.paper.event.entity;
 +
 +import org.bukkit.entity.LivingEntity;
-+import org.bukkit.entity.Player;
 +import org.bukkit.event.Cancellable;
 +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.NotNull;
-+import org.jetbrains.annotations.Nullable;
 +
 +/**
 + * Called when a LivingEntity loads a crossbow with a projectile.
 + */
 +public class EntityLoadCrossbowEvent extends EntityEvent implements Cancellable {
-+    private static final HandlerList handlers = new HandlerList();
++    private static final HandlerList HANDLER_LIST = new HandlerList();
++
 +    private final ItemStack crossbow;
 +    private final EquipmentSlot hand;
 +    private boolean cancelled;
 +    private boolean consumeItem = true;
 +
-+    public EntityLoadCrossbowEvent(@NotNull LivingEntity entity, @Nullable ItemStack crossbow, @NotNull EquipmentSlot hand) {
++    @ApiStatus.Internal
++    public EntityLoadCrossbowEvent(@NotNull LivingEntity entity, @NotNull ItemStack crossbow, @NotNull EquipmentSlot hand) {
 +        super(entity);
 +        this.crossbow = crossbow;
 +        this.hand = hand;
@@ -49,7 +50,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the crossbow involved in this event
 +     */
-+    @Nullable
++    @NotNull
 +    public ItemStack getCrossbow() {
 +        return crossbow;
 +    }
@@ -99,11 +100,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +
 +    @NotNull
 +    public static HandlerList getHandlerList() {
-+        return handlers;
++        return HANDLER_LIST;
 +    }
 +}