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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:401) at oracle.jms.AQjmsMessage.convertPropertyListToHashtable(AQjmsMessage.java:2373) at oracle.jms.AQjmsConsumer.dequeue(AQjmsConsumer.java:2012) at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:914) at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:833) at oracle.jms.AQjmsConsumer.receiveNoWait(AQjmsConsumer.java:756) at aqapitest.TestAqJms.main(TestAqJms.java:104)