AXIS2::Serialization of conplex type throws NPE

[Pradeepta Bhattacharya]

When trying to invoke a RPC based service, Axis throws an exception when trying to serialize a response of hierarchic bean structure to response SOAP request. I have attached the service jar deployed on JBoss 4.0.4 and I have tested the simple response sayHello but when it comes to complex structure axis throws NPE. Any help on what might be wrong is highly appreciated. Thanks a lot.   ///////////////////////////////////////////////////////////////// ////////////////////////// REQUEST  ///////////////////////////// /////////////////////////////////////////////////////////////////   <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">                <soapenv:Header/>                <soapenv:Body>                                <airAvailability xmlns="http://ShoppingEngine.shoppingengine.airtrade.project.bsil.com/types">                                               <param0>                                                              <originDestination xmlns="http://air.airtrade.project.bsil.com/xsd">                                                                             <departureDate>2006-08- 28T00:22:08.968+05:30</departureDate>                                                                             <destination>MIA</destination>                                                                             <origin>CDG</origin>                                                              </originDestination>                                                              <tripType xmlns="http://air.airtrade.project.bsil.com/xsd">1</tripType>                                               </param0>                                </airAvailability>                </soapenv:Body> </soapenv:Envelope>     ///////////////////////////////////////////////////////////////// ////////////////////////// RESPONSE ///////////////////////////// /////////////////////////////////////////////////////////////////   <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">                <soapenv:Header/>                <soapenv:Body>                                <soapenv:Fault>                                               <faultcode>soapenv:Client</faultcode>                                               <faultstring>java.lang.NullPointerException</faultstring>                                               <detail>                                                              <Exception>org.apache.axis2.AxisFault: java.lang.NullPointerException; nested exception is:                org.apache.axiom.om.OMException: java.lang.NullPointerException&#13;                at org.apache.axis2.AxisFault.makeFault(AxisFault.java:318)&#13;                at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic (RPCMessageReceiver.java:150)&#13;                at org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive (AbstractInOutSyncMessageReceiver.java:37)&#13;                at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:504) &#13;                at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest (HTTPTransportUtils.java:284)&#13;                at org.apache.axis2.transport.http.AxisServlet.doPost (AxisServlet.java:144)&#13;                at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)&#13;                at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)&#13;                at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:252)&#13;                at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:173)&#13;                at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter (ReplyHeaderFilter.java:96)&#13;                at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:202)&#13;                at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:173)&#13;                at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:213)&#13;                at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:178)&#13;                at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke (SecurityAssociationValve.java:175)&#13;                at org.jboss.web.tomcat.security.JaccContextValve.invoke (JaccContextValve.java:74)&#13;                at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:126)&#13;                at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105)&#13;                at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:107)&#13;                at org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:148)&#13;                at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:869)&#13;                at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processCo nnection(Http11BaseProtocol.java:664)&#13;                at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket (PoolTcpEndpoint.java:527)&#13;                at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run (MasterSlaveWorkerThread.java:112)&#13;                at java.lang.Thread.run(Thread.java:534)&#13; Caused by: org.apache.axiom.om.OMException: java.lang.NullPointerException&#13;                at org.apache.axiom.om.impl.builder.StAXOMBuilder.next (StAXOMBuilder.java:206)&#13;                at org.apache.axiom.om.impl.llom.OMNodeImpl.build (OMNodeImpl.java:298)&#13;                at org.apache.axiom.om.impl.llom.OMElementImpl.detach (OMElementImpl.java:586)&#13;                at org.apache.axiom.om.impl.llom.OMNodeImpl.setParent (OMNodeImpl.java:118)&#13;                at org.apache.axiom.om.impl.llom.OMElementImpl.addChild (OMElementImpl.java:241)&#13;                at org.apache.axiom.om.impl.llom.OMElementImpl.addChild (OMElementImpl.java:198)&#13;                at org.apache.axis2.rpc.receivers.RPCUtil.processResponse (RPCUtil.java:72)&#13;                at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic (RPCMessageReceiver.java:141)&#13;                ... 24 more&#13; Caused by: java.lang.NullPointerException&#13;                at org.apache.axis2.databinding.utils.BeanUtil.getPullParser (BeanUtil.java:95)&#13;                at org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.processPrope rties(ADBXMLStreamReaderImpl.java:953)&#13;                at org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.next (ADBXMLStreamReaderImpl.java:807)&#13;                at org.apache.axis2.util.StreamWrapper.next(StreamWrapper.java:68) &#13;                at org.apache.axiom.om.impl.builder.StAXOMBuilder.next (StAXOMBuilder.java:123)&#13;                ... 31 more&#13; </Exception>                                               </detail>                                </soapenv:Fault>                </soapenv:Body> </soapenv:Envelope>