Clean queuemanager on disable

src/main/java/com/gmail/nossr50/database/queuemanager/AsyncQueueManager.java

@@ -2,7 +2,6 @@ package com.gmail.nossr50.database.queuemanager;
 
 import java.util.concurrent.LinkedBlockingQueue;
 
-
 public class AsyncQueueManager implements Runnable {
 
     private LinkedBlockingQueue<Queueable> queue;
@@ -13,6 +12,7 @@ public class AsyncQueueManager implements Runnable {
         this.running = true;
     }
     
+
     @Override
     public void run() {
         while(running) {
@@ -24,10 +24,6 @@ public class AsyncQueueManager implements Runnable {
         }
     }
 
-    public void disable() {
-        running = false;
-    }
-
     public boolean queue(Queueable task) {
         return queue.offer(task);
     }
@@ -50,4 +46,16 @@ public class AsyncQueueManager implements Runnable {
         }
     }
 
+    public void disable() {
+        running = false;
+        // Throw one more Queueable into queue to unblock take()
+        queue.add(new EndThread());
+    }
+
+    private class EndThread implements Queueable {
+        @Override
+        public void run() { }
+        @Override
+        public String getPlayer() { return null; }     
+    }
 }

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -176,6 +176,10 @@ public class mcMMO extends JavaPlugin {
         catch (NullPointerException e) {}
 
         getServer().getScheduler().cancelTasks(this); // This removes our tasks
+        if (Config.getInstance().getUseMySQL()) {
+            queueManager.disable();
+            queueManager = null;
+        }
         HandlerList.unregisterAll(this); // Cancel event registrations
 
         if (Config.getInstance().getBackupsEnabled()) {