java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.jms.AQjmsMessage.acknowledge(AQjmsMessage.java:2036)
at com.jms.util.AQMessageListener.onMessage(AQMessageListener.java:48)
at oracle.jms.AQjmsListenerWorker.dispatchOneMsg(AQjmsListenerWorker.java:316)
at oracle.jms.AQjmsListenerWorker.run(AQjmsListenerWorker.java:129)
at java.lang.Thread.run(Thread.java:662)

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