Paper/Spigot-Server-Patches/0243-Re-add-vanilla-entity-warnings-for-duplicates.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 19 Jul 2018 01:08:05 -0400
Subject: [PATCH] Re-add vanilla entity warnings for duplicates

These are a critical sign that somethin went wrong, and you've lost some data....

We should kind of know about these things you know.

diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index dbc7db5c52752c52b3e84b370bbf38772dc20766..781b84535c105987d4b65e744977c87049b2a1a4 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -958,7 +958,8 @@ public class WorldServer extends World implements GeneratorAccessSeed {
         if (entity1 == null) {
             return false;
         } else {
-            // WorldServer.LOGGER.warn("Keeping entity {} that already exists with UUID {}", EntityTypes.getName(entity1.getEntityType()), entity.getUniqueID().toString()); // CraftBukkit
+            WorldServer.LOGGER.error("Keeping entity {} that already exists with UUID {}", EntityTypes.getName(entity1.getEntityType()), entity.getUniqueID().toString()); // CraftBukkit // paper
+            WorldServer.LOGGER.error("Deleting duplicate entity {}", entity); // CraftBukkit // paper
             return true;
         }
     }