[Axis2 1.0] MessageContext question

[Ken Campbell]

Hi,   If someone understands the AxisEngine well I’d appreciate them having a look at this problem:   I’m having a data binding error which I don’t understand. In an attempt to trace it I’ve called: System.out.println(msgContext.getEnvelope()); in MyMessageReceiverInOut.invokeBusinessLogic()   This seems to have a very weird effect. By placing it here :   … if("login".equals(methodName)){                 uk.co.edp.ws.paf.LoginResponseDocument param11 = null;             System.out.println(msgContext.getEnvelope());                                 //doc style              param11 =skel.login(                      (uk.co.edp.ws.paf.LoginRequestDocument)fromOM(                              msgContext.getEnvelope().getBody().getFirstElement(),                              uk.co.edp.ws.paf.LoginRequestDocument.class,                              getEnvelopeNamespaces(msgContext.getEnvelope())));                                       envelope = toEnvelope(getSOAPFactory(msgContext), param11, false);               System.out.println("toEnvelope() returned."); …     the service classes will return a valid param11, but axis throws an exception:   - Servlet.service() for servlet AxisServlet threw exception java.lang.NullPointerException             at com.ctc.wstx.util.BijectiveNsMap.findPrefixByUri(BijectiveNsMap.java:132)             at com.ctc.wstx.sw.SimpleOutputElement.getPrefix(SimpleOutputElement.java:453)             at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeAttributes(StreamingOMSerializer.java:214)             at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeElement(StreamingOMSerializer.java:147)             at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeNode(StreamingOMSerializer.java:73)             at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serialize(StreamingOMSerializer.java:56)             at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeByPullStream(OMSerializerUtil.java:315)             at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:786)             at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMElementImpl.java:809)             at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:780)             at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:171)             at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMElementImpl.java:809)             at org.apache.axiom.om.impl.llom.OMNodeImpl.serializeAndConsume(OMNodeImpl.java:381)             at org.apache.axis2.transport.http.CommonsHTTPTransportSender.sendUsingOutputStream(CommonsHTTPTransportSender.java:256)             at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:210)             at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:589)             at org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive(AbstractInOutSyncMessageReceiver.java:43)             at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:454)….. - Servlet.service() for servlet jsp threw exception java.lang.IllegalStateException: getOutputStream() has already been called for this response….   So my question is, it seems as if MessageContext.getEnvelope() in some way ‘consumes’ the data stream. How is it possible that I am getting a response from my service classes when I do this and that no other class complains about my intercepting msgContext until BijectiveNsMap ? The data binding error is normally thrown in MyMessageReceiverInOut.fromOM() at the request but when I call msgContext.getEnvelope() it happily goes off and gets a proper response!   Regards, Ken