@GET
 @Path("{id}/{password}")
 @Produces("text/plain")
 public String find(@PathParam("id") String id, @PathParam("password") String password) {
   User usr = super.find(id);
   if (usr != null) {
     if (password.equals(usr.getPassword())) {
       return "yes";
     }
   }
   return "no";
 }
 @POST
 @Consumes({"application/json"})
 @Produces("application/json")
 public String createUser(User entity) {
   try {
     Query q = getEntityManager().createQuery("SELECT u FROM User u WHERE u.username = :username");
     q.setParameter("username", entity.getUsername());
     User user = (User) q.getSingleResult();
     if (user != null) return "no";
   } catch (NoResultException ex) {
     System.out.println("User non presente");
   } catch (Exception ex) {
     ex.printStackTrace();
   }
   try {
     super.create(entity);
     return "yes";
   } catch (Exception ex) {
     ex.printStackTrace();
     return "no";
   }
 }