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

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java.lang.NullPointerException:
at oracle.toplink.mappings.DirectToFieldMapping.compareObjects(DirectToFieldMapping.java:154)
at oracle.toplink.mappings.DirectToFieldMapping.compareForChange(DirectToFieldMapping.java:136)
at oracle.toplink.internal.descriptors.ObjectBuilder.compareForChange(ObjectBuilder.java:825)
at oracle.toplink.mappings.AggregateMapping.compareForChange(AggregateMapping.java:247)
at oracle.toplink.internal.descriptors.ObjectBuilder.compareForChange(ObjectBuilder.java:825)
at oracle.toplink.publicinterface.UnitOfWork.calculateChanges(UnitOfWork.java:438)
at oracle.toplink.publicinterface.UnitOfWork.commitToDatabaseWithChangeSet(UnitOfWork.java:1135)
at oracle.toplink.publicinterface.UnitOfWork.issueSQLbeforeCompletion(UnitOfWork.java:2492)
at oracle.toplink.jts.oracle9i.Oracle9iJTSSynchronizationListener.beforeCompletion(Oracle9iJTSSynchronizationListener.java:75)
at com.evermind.server.ApplicationServerTransaction.callSynchronizationBeforeCompletion(ApplicationServerTransaction.java:1320)
at com.evermind.server.ApplicationServerTransaction.beforeCompletion(ApplicationServerTransaction.java:1223)
at com.evermind.server.ApplicationServerTransaction.commit(ApplicationServerTransaction.java:630)
at com.evermind.server.ApplicationServerTransaction.end(ApplicationServerTransaction.java:980)
at undefined.RequestRemote_StatelessSessionBeanWrapper332.continueRequestDNRTRANSFER(RequestRemote_StatelessSessionBeanWrapper332.java:23568)
at ae.co.etisalat.cbcm.web.soh.request.RequestModel.continueRequest(RequestModel.java:169)
at ae.co.etisalat.cbcm.web.soh.customerrequest.CustomerRequestAction.continueRequest(CustomerRequestAction.java:6945)
at ae.co.etisalat.cbcm.web.soh.customerrequest.CustomerRequestAction.execute(CustomerRequestAction.java:510)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:560)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
at java.lang.Thread.run(Thread.java:534)

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