Confused by Namespace

[Jim Redman <jr...@ergotech.com>]

If I take this code, which is a fairly lightly modified version of the 
unit test code generated by wsdl2java:

try {
  javax.xml.rpc.ServiceFactory serviceFactory =
             javax.xml.rpc.ServiceFactory.newInstance();
  java.net.URL url = new
    java.net.URL("http://opcfoundation.org/webservices/XMLDA/1.0/");
  javax.xml.rpc.Service service = serviceFactory.createService(url, new
         QName("http://opcfoundation.org/webservices/XMLDA/1.0/", ""));
  assertTrue(service != null);
} catch ( Exception any  ) {
  any.printStackTrace();
}

the exception printed is:

.javax.xml.rpc.ServiceException: Error processing WSDL document:
WSDLException (at /definitions/message[1]/part): 
faultCode=UNBOUND_PREFIX: Unable to determine namespace of 's0:GetStatus'.:
	at org.apache.axis.client.Service.initService(Service.java:249)
	at org.apache.axis.client.Service.<init>(Service.java:164)
	at 
org.apache.axis.client.ServiceFactory.createService(ServiceFactory.java:198)
	at 
com.ergotech.vib.servers.opc.xmldaclient.OpcXmlDATestCase.testOpcXmlDASoapWSDL(OpcXmlDATestCase.java:25)
	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)
	[..]

I'm sure that I must be doing something obviously wrong and stupid, but 
have no idea what and would appreciate enlightenment.

Thanks,

Jim

-- 
Jim Redman
(505) 662 5156 x85
http://www.ergotech.com