@GET
    @Path("/{id:[0-9][0-9]*}")
    @Produces("application/json")
    public Response findById(@PathParam("id") Long id, @Context Request request) {
        TypedQuery<User> findByIdQuery = em
                .createQuery(
                        "SELECT DISTINCT u FROM User u WHERE u.id = :entityId ORDER BY u.id",
                        User.class);
        findByIdQuery.setParameter("entityId", id);
        User entity;
        try {
            entity = findByIdQuery.getSingleResult();
        } catch (NoResultException nre) {
            entity = null;
        }
        CacheControl cacheControl = new CacheControl();
        cacheControl.setMaxAge(86400);

        EntityTag etag = new EntityTag(Integer.toString(entity.hashCode()));
        ResponseBuilder builder = request.evaluatePreconditions(etag);

        if (builder == null) {
            builder = Response.ok(entity);
            builder.tag(etag);
        }
        builder.cacheControl(cacheControl);
        return builder.build();
    }