Error in JMSServer when trying to process XML Data.

 I am facing a error when I am trying to process the XML data. The Error is:
  17:48:13.656 ERROR [Scheduler-Worker-12] - java.rmi.RemoteException: null;
nested exception is:
java.lang.NullPointerException
java.rmi.RemoteException: null; nested exception is:
java.lang.NullPointerException
at org.exolab.jms.client.net.JmsSessionStubImpl__Proxy.onMessage
(JmsSessionStubImpl__Proxy.java:249)
at org.exolab.jms.server.JmsServerSession.onMessage(JmsServerSession.java
:696)
at org.exolab.jms.messagemgr.QueueConsumerEndpoint.deliverMessages(
QueueConsumerEndpoint.java:266)
at org.exolab.jms.messagemgr.AbstractConsumerEndpoint.run(
AbstractConsumerEndpoint.java:309)
at org.exolab.jms.common.threads.ThreadPoolWorker.runIt(
ThreadPoolWorker.java:192)
at org.exolab.jms.common.threads.ThreadPoolWorker.runWork(
ThreadPoolWorker.java:177)
at org.exolab.jms.common.threads.ThreadPoolWorker.access$000(
ThreadPoolWorker.java:64)
at org.exolab.jms.common.threads.ThreadPoolWorker$1.run(
ThreadPoolWorker.java:119)
at java.lang.Thread.run(Thread.java:534)
  please help in this regard ...................................