public Users getUserByLoginId(String email){
            String queryString = "SELECT user FROM Users user " +
                         "WHERE :user.email = :email";
            Query query = entityManager.createQuery(queryString);

            query.setParameter("email", email);
//            List al = new ArrayList(query.getResultList());
//            return (Users)al.get(0);
            List<?> list = query.getResultList();
            if(list == null || list.size() == 0) throw new UsernameNotFoundException("User not found");

            return (Users)list.get(0);