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

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This exception has no message.
java.lang.NullPointerException:
at oracle.jms.AQjmsProducer.checkMessageType(AQjmsProducer.java:1561)
at oracle.jms.AQjmsProducer.enqueue(AQjmsProducer.java:614)
at oracle.jms.AQjmsProducer.send(AQjmsProducer.java:546)
at oracle.jms.AQjmsProducer.send(AQjmsProducer.java:394)
at undefined.TestRegisteredAQQCF.sendMessageToQueue(TestRegisteredAQQCF.java:142)
at undefined.TestRegisteredAQQCF.send(TestRegisteredAQQCF.java:49)
at undefined.TestRegisteredAQQCF.main(TestRegisteredAQQCF.java:24)

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