Simple REST doesn't work

Hi all!,
I am trying to implement a very simple rest web service following the guide:
https://tomee.apache.org/tomee-8.0/examples/simple-rest.html

and this is my code:

@Path(" articuloservice ")
public class ArticulosService {

    @Inject
    private ArticuloDao articuloDao;

    @GET
    @Path("/saludar")
    @Produces(MediaType.TEXT_PLAIN)
    public String Saludo() {
        return "Helloooo!";
    }
}

I am trying to test the code using postman  (GET) :
*http://localhost:8080/Hiper/articuloservice/saludar
<http://localhost:8080/Hiper/articuloservice/saludar>*

getting the following response: "*The required resource is not available*"

Maybe I am missing something?...any idea?
Thanks in advance!
Fernando