RESTEasy ignores the response set on HttpServletResponse in EAP 5.1

Issue

We would like to change the server response using the HttpServletResponse injected in our JAX-RS resource. Here is an example code:

@Path("test")
public class TestResource {
    @Context
    HttpServletResponse theResponse;

    @GET
    public String test(@Context HttpServletRequest theRequest) throws Exception {
        theResponse.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        return "hello";
    }
}

But RESTEasy is ignoring the response code set on HttpServletResponse object. What am I doing wrong?