[axis2 1.0 RC4] blocking dual client - null pointer exception

[Diego]

Hi everybody!

I added the lines between the comments to the code generated by the wsdl 
2java in order to have a blocking dual transport client.  But I get a 
null pointer exception.

Thanks for any help!

Diego


Exception:
==========

Exception in thread "main" java.lang.NullPointerException
        at 
org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:259)
        at 
org.astrodas.ws.peer.AstrodasPeerStub.insertMappingAnnotations(AstrodasPeerStub.java:122)
        at 
org.astrodas.ws.peer.AstrodasPeerProxy.insertMappingAnnotations(AstrodasPeerProxy.java:36)
        at org.astrodas.test.Populate.populateLocal(Populate.java:239)
        at org.astrodas.test.Populate.main(Populate.java:350)

Code:
=====

public org.astrodas.ws.model.InsertMappingAnnotationsResponseDocument 
insertMappingAnnotations(
    org.astrodas.ws.model.InsertMappingAnnotationsDocument param4)
    throws java.rmi.RemoteException {
    try {
        org.apache.axis2.client.OperationClient _operationClient = 
_serviceClient.createClient(_operations[0].getName());

_operationClient.getOptions().setAction("insertMappingAnnotations");

_operationClient.getOptions().setExceptionToBeThrownOnSOAPFault(true);

//====================================================================================
        // Dual client lines added

//==================================================================================== 


_operationClient.getOptions().setTransportInProtocol(Constants.TRANSPORT_HTTP);
        _operationClient.getOptions().setUseSeparateListener(true);
        _operationClient.getOptions().setAction("urn:echo");
        _serviceClient.engageModule(new 
javax.xml.namespace.QName(Constants.MODULE_ADDRESSING));

//====================================================================================
        // Dual client lines added

//====================================================================================
        // create SOAP envelope with that payload
        org.apache.axiom.soap.SOAPEnvelope env = null;
        //Style is Doc.
        env = toEnvelope(getFactory(_operationClient.getOptions()
                                                    .getSoapVersionURI()),
                param4,
                optimizeContent(
                    new javax.xml.namespace.QName("",
                        "insertMappingAnnotations")));
        // create message context with that soap envelope
        org.apache.axis2.context.MessageContext _messageContext = new 
org.apache.axis2.context.MessageContext();
        _messageContext.setEnvelope(env);
        // add the message contxt to the operation client
        _operationClient.addMessageContext(_messageContext);
        //execute the operation client
        _operationClient.execute(true);
        org.apache.axis2.context.MessageContext _returnMessageContext = 
_operationClient.getMessageContext(org.apache.axis2.wsdl.WSDLConstants.MESSAGE_LABEL_IN_VALUE);
        org.apache.axiom.soap.SOAPEnvelope _returnEnv = 
_returnMessageContext.getEnvelope();
        java.lang.Object object = fromOM(getElement(_returnEnv, 
"document"),

org.astrodas.ws.model.InsertMappingAnnotationsResponseDocument.class);

_messageContext.getTransportOut().getSender().cleanUp(_messageContext);
        return 
(org.astrodas.ws.model.InsertMappingAnnotationsResponseDocument) object;
    } catch (org.apache.axis2.AxisFault f) {
        ...
    }