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This exception has no message.
java.lang.NullPointerException: 	at java.util.concurrent.LinkedBlockingQueue.extract(LinkedBlockingQueue.java:137)	at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:420)	at org.jivesoftware.wildfire.pubsub.PubSubEngine$PublishedItemTask.run(PubSubEngine.java:1926)	at java.util.TimerThread.mainLoop(Timer.java:512)	at java.util.TimerThread.run(Timer.java:462)