PaperMC/patches/server/0869-Don-t-use-level-random-in-entity-constructors.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 10 Jul 2022 14:13:22 -0700
Subject: [PATCH] Don't use level random in entity constructors

Paper makes the entity random thread-safe
and constructing an entity off the main thread
should be supported. Some entities (for whatever
reason) use the level's random in some places.

diff --git a/src/main/java/net/minecraft/world/entity/animal/Bee.java b/src/main/java/net/minecraft/world/entity/animal/Bee.java
index a3aeab5fa137f80a229db2edba07d9900f7becfe..337a88a7cd6445004d005ef8d56af1b1cdf800d9 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Bee.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Bee.java
@@ -1031,7 +1031,7 @@ public class Bee extends Animal implements NeutralMob, FlyingAnimal {
 
         BeeGoToHiveGoal() {
             super();
-            this.travellingTicks = Bee.this.level.random.nextInt(10);
+            this.travellingTicks = Bee.this./* level. */random.nextInt(10); // Paper - use entity random
             this.blacklistedTargets = Lists.newArrayList();
             this.setFlags(EnumSet.of(Goal.Flag.MOVE));
         }
@@ -1148,7 +1148,7 @@ public class Bee extends Animal implements NeutralMob, FlyingAnimal {
 
         BeeGoToKnownFlowerGoal() {
             super();
-            this.travellingTicks = Bee.this.level.random.nextInt(10);
+            this.travellingTicks = Bee.this./* level. */random.nextInt(10); // Paper - use entity random
             this.setFlags(EnumSet.of(Goal.Flag.MOVE));
         }
 
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 62f2a070e4c80846a9d696445212c65289037928..d9da6728d60e97eb9032b0a5aa71757d11f36e22 100644
--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
@@ -62,7 +62,12 @@ public class ItemEntity extends Entity {
     }
 
     public ItemEntity(Level world, double x, double y, double z, ItemStack stack) {
-        this(world, x, y, z, stack, world.random.nextDouble() * 0.2D - 0.1D, 0.2D, world.random.nextDouble() * 0.2D - 0.1D);
+        // Paper start - don't use world random in entity constructor
+        this(EntityType.ITEM, world);
+        this.setPos(x, y, z);
+        this.setDeltaMovement(this.random.nextDouble() * 0.2D - 0.1D, 0.2D, this.random.nextDouble() * 0.2D - 0.1D);
+        this.setItem(stack);
+        // Paper end
     }
 
     public ItemEntity(Level world, double x, double y, double z, ItemStack stack, double velocityX, double velocityY, double velocityZ) {
diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
index 4b81d62d3250b99cbcb4eb2468ef81c149bf177e..bedee2c93bd0aff148f93dcf111e0fc3d9bce4a0 100644
--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
@@ -32,7 +32,7 @@ public class PrimedTnt extends Entity {
     public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
         this(EntityType.TNT, world);
         this.setPos(x, y, z);
-        double d3 = world.random.nextDouble() * 6.2831854820251465D;
+        double d3 = this.random.nextDouble() * 6.2831854820251465D; // Paper - don't use world random in entity constructor
 
         this.setDeltaMovement(-Math.sin(d3) * 0.02D, 0.20000000298023224D, -Math.cos(d3) * 0.02D);
         this.setFuse(80);