From 9add7d3000c15268a0b277aabc224c2acf86cc06 Mon Sep 17 00:00:00 2001
From: Travis Watkins <amaranth@ubuntu.com>
Date: Fri, 16 Nov 2012 16:46:58 -0600
Subject: [PATCH] Don't create tile entity when block placement fails. Fixes
 BUKKIT-2924

End portals can only be placed in the end during the dragon's death.
Attempts to place them outside of this window causes the block to remove
itself. However, we still create the tile entity for the portal which
leads to exceptions spamming the console about a tile entity existing
without the appropriate block. In these cases we should not place the tile
entity at all.
---
 src/main/java/net/minecraft/server/Chunk.java | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 62c7109052..8732e7a824 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -437,6 +437,12 @@ public class Chunk {
                     }
 
                     if (Block.byId[l] instanceof BlockContainer) {
+                        // CraftBukkit start - don't create tile entity if placement failed
+                        if (this.getTypeId(i, j, k) != l) {
+                            return false;
+                        }
+                        // CraftBukkit end
+
                         tileentity = this.e(i, j, k);
                         if (tileentity == null) {
                             tileentity = ((BlockContainer) Block.byId[l]).a(this.world);