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Prevent empty items from being added to world (#7998) 

The previous solution caused a bunch of bandaid fixes inorder to resolve edge cases where minecraft/the api might spawn items that are air.
Just simply prevent them from being added to the world instead.
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Owen 2022-06-16 17:31:23 -04:00 committed by GitHub
parent 0ae78d381a
commit f428887cc1
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patches/server/0915-Prevent-empty-items-from-being-added-to-world.patch Normal file
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Wed, 15 Jun 2022 21:52:57 -0400
Subject: [PATCH] Prevent empty items from being added to world
The previous solution caused a bunch of bandaid fixes inorder to resolve edge cases where minecraft/the api might spawn items that are air.
Just simply prevent them from being added to the world instead.
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 0dc7a827aeacc7fae53b1f975f45883da7db6a0c..6ef4160cb9cc836371a03451bdc3f88c84167ec4 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1433,6 +1433,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
// WorldServer.LOGGER.warn("Tried to add entity {} but it was marked as removed already", EntityTypes.getKey(entity.getType())); // CraftBukkit
return false;
} else {
+ if (entity instanceof net.minecraft.world.entity.item.ItemEntity itemEntity && itemEntity.getItem().isEmpty()) return false; // Paper - Prevent empty items from being added
// Paper start - capture all item additions to the world
if (captureDrops != null && entity instanceof net.minecraft.world.entity.item.ItemEntity) {
captureDrops.add((net.minecraft.world.entity.item.ItemEntity) entity);
diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
index ae4b251e10babb07055d031ff48ac7dd5d4be4a0..08f15739dd7e2ab80718ab8d983b483a46309deb 100644
--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
@@ -509,7 +509,7 @@ public class ItemEntity extends Entity {
}
public void setItem(ItemStack stack) {
- com.google.common.base.Preconditions.checkArgument(!stack.isEmpty(), "Cannot drop air"); // CraftBukkit
+ // com.google.common.base.Preconditions.checkArgument(!stack.isEmpty(), "Cannot drop air"); // CraftBukkit // Paper - Remove check
this.getEntityData().set(ItemEntity.DATA_ITEM, stack);
this.getEntityData().markDirty(ItemEntity.DATA_ITEM); // CraftBukkit - SPIGOT-4591, must mark dirty
this.despawnRate = level.paperConfig().entities.spawning.altItemDespawnRate.enabled ? level.paperConfig().entities.spawning.altItemDespawnRate.items.getOrDefault(stack.getItem(), level.spigotConfig.itemDespawnRate) : level.spigotConfig.itemDespawnRate; // Paper