RESTful Web Service won't call from URL

I am making a test RESTful service which has the role of returning a result of two numbers forwarded via the URL. I'm currently trying: http://localhost:8080/XMLWSAssignment/AddService/3/5 to combine 3 + 5. However, I am greeted with a "404" error in GlassFish...

Here's the code:

import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.PathParam;


@Path("/MyRestService")
public class MyRestClass {

    @Path("/AddService/{a}/{b}")
    public class AddService {
        @GET
        public String getMessage(@PathParam("a") Integer a, @PathParam("b") Integer b) {
            Integer res = a + b;
            return res.toString();
        }
    }
}