So it begins...

patches/unapplied/server/0215-Implement-World.getEntity-UUID-API.patch

@@ -0,0 +1,26 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Brokkonaut <hannos17@gmx.de>
+Date: Tue, 3 Jul 2018 16:08:14 +0200
+Subject: [PATCH] Implement World.getEntity(UUID) API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 905cf3c98c363c4cd8b236e557572d8cc2ab88a8..58f261162627c3065bb1b518e0e99f5c822c022c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -1040,6 +1040,15 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+         return list;
+     }
+ 
++    // Paper start - getEntity by UUID API
++    @Override
++    public Entity getEntity(UUID uuid) {
++        Preconditions.checkArgument(uuid != null, "UUID cannot be null");
++        net.minecraft.world.entity.Entity entity = world.getEntity(uuid);
++        return entity == null ? null : entity.getBukkitEntity();
++    }
++    // Paper end
++
+     @Override
+     public void save() {
+         org.spigotmc.AsyncCatcher.catchOp("world save"); // Spigot