Re: Help with namespace problem in doWriteDefaultNs (Null Pointer Exception)

Wed, 16 Apr 2008 23:16:20 -0700 

Hi Amila

Any idea about this ?

Thank you!
Deepal
I think I’ve narrowed down the cause of a problem I’m having, but I’m not sure what the solution is. . .any help would be **greatly** appreciated.
I’m trying to consume a web service that has published a pretty simple WSDL (attached). There’s only one method exposed via the service, and it’s called “executeService” which takes a single argument (an XML string). 


I installed Axis2 v1.2 in my Java 1.4 environment and ran this command:
WSDL2Java -uri brms.wsdl -p com.foo.brms.serviceinterface -d xmlbeans -s -o ..\java -R ..\resources
That created a bunch of xmlbean supporting classes and a BRMSServiceStub.java. Here’s how I’m using it:
ExecuteServiceDocument executeServiceDoc = ExecuteServiceDocument.Factory./newInstance/( );
ExecuteService executeService = executeServiceDoc.addNewExecuteService( ); 

    executeService.setArg0( . . . my Xml String here. . . );


    myBrmsServiceStub.executeService( executeServiceDoc );
The NPE stack trace that gets thrown is shown below, but I think the problem is that there is no namespace inserted into the surrounding xml that the generated xmlbeans class (ExecuteService) wraps around my XML. Just before the executeService( ) call is made, here is the message content of the executeServiceDoc: 


<?xml version='1.0' encoding='utf-8'?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";> 

    <soapenv:Body>

        <executeService xmlns="http://endpoint.brmsservice/";>    !!!!!

            <arg0 xmlns="">

               ...my Xml String here. . .

            </arg0>

        </executeService>

    </soapenv:Body>

</soapenv:Envelope>


Shouldn’t the "<executeService" element look more like this?

<blah:executeService xmlns:blah="http://endpoint.brmsservice/";>
I suspect that is the problem, because down in the stack when the doWriteDefaultNs is called, the default namespace is looked up from a map that maps the empty-string found in the executeService element to a null namespace value. 


What did I do wrong?


Thanks in advance!


java.lang.NullPointerException
at com.ctc.wstx.sw.BaseNsStreamWriter.doWriteDefaultNs(BaseNsStreamWriter.java:529)
at com.ctc.wstx.sw.SimpleNsStreamWriter.writeDefaultNamespace(SimpleNsStreamWriter.java:113)
at com.ctc.wstx.sw.SimpleNsStreamWriter.writeNamespace(SimpleNsStreamWriter.java:121)
at org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeNamespace(MTOMXMLStreamWriter.java:148)
at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeElement(StreamingOMSerializer.java:238)
at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeNode(StreamingOMSerializer.java:71)
at org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serialize(StreamingOMSerializer.java:54)
at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeByPullStream(OMSerializerUtil.java:490)
at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:783)
at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMElementImpl.java:808)
at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.serializeInternally(SOAPEnvelopeImpl.java:234)
at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:222)
at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMElementImpl.java:808)
at org.apache.axiom.om.impl.llom.OMNodeImpl.serializeAndConsume(OMNodeImpl.java:418)
at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:55)
at org.apache.axis2.transport.http.AxisRequestEntity.writeRequest(AxisRequestEntity.java:84)
at org.apache.commons.httpclient.methods.EntityEnclosingMethod.writeRequestBody(EntityEnclosingMethod.java:495)
at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:1973)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:993)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:397)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:558)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:176)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:73)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:305)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:201) 

      at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:452)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:330)
at org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:294)
at com.xmradio.brms.serviceinterface.BRMSServiceStub.executeService(BRMSServiceStub.java:147)
**Tom Vaughan ****| **Technical Architect | direct 212 798 7367 | mobile 703 623 7101 | fax 212 966 6915 [Logo] 




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