GWT RPC with Spring 3 backend

[Clemens Brunnow]

Hi i am trying to implement a spring backend to serve for GWT RPC calls.

So far i got this in backend:

@Controller
@RequestMapping("/userService/")
public class UserServiceRPC extends RemoteServiceServlet implements UserService {

    @Override
    @RequestMapping(method = RequestMethod.POST, headers = "Content-Type=application/json")
    public UserDto login(@RequestBody String username, @RequestBody String password) {

		...
    }
}

The problem is, as soon as i do the request, the server returns: Method 'POST' not supported. Probably because the matching method cannot be found.
If i remove the @RequestBody annotations it will work, but the parameters (username, password) will be null.

Has anyone ever mentioned implementing such a service to work for GWT-RPCs?