Create read-only REST endpoint from Entity

/**
 * JAX-RS Example
 *
 * This class produces a RESTful service to read the contents of the members table.
 */
@Path("/members")
@RequestScoped
public class MemberResourceRESTService {
   @Inject
   private EntityManager em;

   @GET
   @Produces("text/xml")
   public List<Member> listAllMembers() {
      // Use @SupressWarnings to force IDE to ignore warnings about "genericizing" the results of
      // this query
      @SuppressWarnings("unchecked")
      // We recommend centralizing inline queries such as this one into @NamedQuery annotations on
      // the @Entity class
      // as described in the named query blueprint:
      // https://blueprints.dev.java.net/bpcatalog/ee5/persistence/namedquery.html
      final List<Member> results = em.createQuery("select m from Member m order by m.name").getResultList();
      return results;
   }

   @GET
   @Path("/{id:[0-9][0-9]*}")
   @Produces("text/xml")
   public Member lookupMemberById(@PathParam("id") long id) {
      return em.find(Member.class, id);
   }
}

/**
 * A class extending {@link Application} and annotated with @ApplicationPath is the Java EE 6
 * "no XML" approach to activating JAX-RS.
 *
 * <p>
 * Resources are served relative to the servlet path specified in the {@link ApplicationPath}
 * annotation.
 * </p>
 */
@ApplicationPath("/rest")
public class JaxRsActivator extends Application {
   /* class body intentionally left blank */
}