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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 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 org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)	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 EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:803)	at java.lang.Thread.run(Thread.java:534)