From 1b5f25c89db42d48a6140d1a2e17e11c53ca71a7 Mon Sep 17 00:00:00 2001
From: riking <rikingcoding@gmail.com>
Date: Wed, 14 May 2014 13:46:48 -0700
Subject: [PATCH] Process conversation input on the main thread. Fixes
 BUKKIT-5611


diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 58ae547..d8d7a70 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -834,7 +834,25 @@ public class PlayerConnection implements PacketPlayInListener {
             } else if (s.isEmpty()) {
                 c.warn(this.player.getName() + " tried to send an empty message");
             } else if (getPlayer().isConversing()) {
-                getPlayer().acceptConversationInput(s);
+                final String message = s;
+
+                Waitable waitable = new Waitable() {
+                    @Override
+                    protected Object evaluate() {
+                        getPlayer().acceptConversationInput(message);
+                        return null;
+                    }
+                };
+
+                this.minecraftServer.processQueue.add(waitable);
+
+                try {
+                    waitable.get();
+                } catch (InterruptedException e) {
+                    Thread.currentThread().interrupt();
+                } catch (ExecutionException e) {
+                    throw new RuntimeException(e);
+                }
             } else if (this.player.getChatFlags() == EnumChatVisibility.SYSTEM) { // Re-add "Command Only" flag check
                 ChatMessage chatmessage = new ChatMessage("chat.cannotSend", new Object[0]);
 
-- 
1.9.1