jersey @GET collection and @GET collection filtered by @QueryParam

Question

In my app users can register, that users can post workouts and comments on workouts.

I design following resources and URIs:

USERS
/users
/users/{id}

WORKOUTS
/workouts
/workouts/{id}

COMMENTS
/workouts{id}/comments
/workouts{id}/comments/{id}

Since /workouts URI returns timeline, I tried to map user's workouts like /workouts?user=userId

I don´t know how distinguish between get all collection and get collection filtered by @QueryParam, because:

@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Practicas getPracticas() {
    List<Practica> listaPracticas = practicaDao.getPracticas();
    Practicas practicas = new Practicas();
    practicas.setPracticas(listaPracticas);
    return practicas;
}

@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Practicas getPracticasUsuario(@QueryParam("idUsuario") int idUsuario) {
    List<Practica> listaPracticas = practicaDao.getPracticasByUser(idUsuario);
    Practicas practicas = new Practicas();
    practicas.setPracticas(listaPracticas);
    return practicas;
}

throw following exception:

org.glassfish.jersey.server.model.ModelValidationException: Validation of the application resource model has failed during application initialization.
[[FATAL] A resource model has ambiguous (sub-)resource method for HTTP method GET and input mime-types as defined by @Consumes and @Produces annotations at Java methods public com.sporty.model.Practicas com.sporty.resource.PracticasResource.getPracticas() and public com.sporty.model.Practicas com.sporty.resource.PracticasResource.getPracticasUsuario(int) at matching regular expression /practicas. These two methods produces and consumes exactly the same mime-types and therefore their invocation as a resource methods will always fail.; source='org.glassfish.jersey.server.model.RuntimeResource@1cc465f']

Is solution add another level on URI like /workouts/search?user=userId?

Is a problem derived from a poor URI design?

Thanks in advance

Answer 1

I think you're looking for something like:

@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Practicas getPracticasUsuario(@QueryParam("idUsuario") Integer idUsuario) {
    final List<Practica> listaPracticas;
    if (idUsario != null) {
        practicaDao.getPracticasByUser(idUsuario);
    } else {
        practicaDao.getPracticas();
    }
    Practicas practicas = new Practicas();
    practicas.setPracticas(listaPracticas);
    return practicas;

}