IMO, the provider is telling you to change the service endpoint (i.e. where to reach the web service), not the client endpoint (I don't understand what this could be). To change the service endpoint, you basically have two options.
Use the Binding Provider to set the endpoint URL
The first option is to change the
BindingProvider.ENDPOINT_ADDRESS_PROPERTY property value of the
BindingProvider (every proxy implements
... EchoService service = new EchoService(); Echo port = service.getEchoPort(); /* Set NEW Endpoint Location */ String endpointURL = "http://NEW_ENDPOINT_URL"; BindingProvider bp = (BindingProvider)port; bp.getRequestContext().put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, endpointURL); System.out.println("Server said: " + echo.echo(args)); ...
The drawback is that this only works when the original WSDL is still accessible. Not recommended.
Use the WSDL to get the endpoint URL
The second option is to get the endpoint URL from the WSDL.
... URL newEndpoint = new URL("NEW_ENDPOINT_URL"); QName qname = new QName("http://ws.mycompany.tld","EchoService"); EchoService service = new EchoService(newEndpoint, qname); Echo port = service.getEchoPort(); System.out.println("Server said: " + echo.echo(args)); ...