I'm trying to build a DII client to my webservice as described in the Wiki here:

http://wiki.jboss.org/wiki/Wiki.jsp?page=WSClientDII


It's throwing a RemoteException on call.invoke

ServiceFactoryImpl serviceFactory = (ServiceFactoryImpl) ServiceFactory.newInstance();
Service service = serviceFactory.createService(
 new URL(wsdlUrl),
 new URL(jaxRpcUrl),
 (URL) null,
 new QName(nameSpace, serviceName),
 null
);
Call call = (Call) service.createCall(new QName(nameSpace, portName), methodName);
Object o = call.invoke(new Object[]{order});

which reads:

Error executing remote service:
AxisFault
 faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Client
 faultSubcode:
 faultString: java.lang.NullPointerException
 faultActor:
 faultNode:
 faultDetail:
 {http://xml.apache.org/axis/}stackTrace: java.lang.NullPointerException
 at java.util.Hashtable.put(Hashtable.java:396)
 at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.setProperty(SAXParserImpl.java:395)
 at org.jboss.axis.encoding.DeserializationContextImpl.parse(DeserializationContextImpl.java:262)
 at org.jboss.axis.MessagePart.getAsSOAPEnvelope(MessagePart.java:684)
 at org.jboss.axis.Message.getSOAPEnvelope(Message.java:428)
 at org.jboss.axis.Message.getContentType(Message.java:494)
 at org.jboss.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:386)
 at org.jboss.axis.transport.http.HTTPSender.invoke(HTTPSender.java:126)
 at org.jboss.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:73)
 at org.jboss.axis.SimpleChain.doVisiting(SimpleChain.java:160)
 at org.jboss.axis.SimpleChain.invoke(SimpleChain.java:123)
 at org.jboss.webservice.client.ClientEngine.invoke(ClientEngine.java:128)
 at org.jboss.axis.client.Call.invokeEngine(Call.java:3054)
 at org.jboss.axis.client.Call.invoke(Call.java:3039)
 at org.jboss.axis.client.Call.invoke(Call.java:2629)
 at org.jboss.axis.client.Call.invoke(Call.java:2538)
 at org.jboss.axis.client.Call.invokeInternal(Call.java:1976)
 at org.jboss.axis.client.Call.invoke(Call.java:1914)
 at org.jboss.webservice.client.CallImpl.invoke(CallImpl.java:265)
 at com.mycompany.myapp.service.util.WebServiceClient.sendOrder(WebServiceClient.java:73)
 at com.mycompany.myapp.service.SonicStoreServiceImplTest.testSendRemoteOrder(SonicStoreServiceImplTest.java:138)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 at junit.textui.TestRunner.doRun(TestRunner.java:116)
 at com.intellij.rt.execution.junit2.IdeaJUnitAgent.doRun(IdeaJUnitAgent.java:57)
 at junit.textui.TestRunner.start(TestRunner.java:172)
 at com.intellij.rt.execution.junit.TextTestRunner2.startRunnerWithArgs(TextTestRunner2.java:23)
 at com.intellij.rt.execution.junit2.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:97)
 at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)

Has anyone else seen this error before? I'vev tried other clients and they seem to access the servce without any sort of problems.