The way to do a JAX-WS call with basic authentication is a little unobvious.

Here is an example where Service is the service class representation and Port is the service port you want to access.

Service s = new Service();
Port port = s.getPort();

BindingProvider prov = (BindingProvider)port;
prov.getRequestContext().put(BindingProvider.USERNAME_PROPERTY, "myusername");
prov.getRequestContext().put(BindingProvider.PASSWORD_PROPERTY, "mypassword");

port.call();