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This exception has no message.
java.lang.NullPointerException: 	at org.apache.activemq.transport.AbstractInactivityMonitor.onException(AbstractInactivityMonitor.java:314)	at org.apache.activemq.transport.AbstractInactivityMonitor$4.run(AbstractInactivityMonitor.java:215)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)