public Users getUserByLoginId(String email){
            System.out.println("debug --- a");
            String queryString = "SELECT user FROM Users user " +
                         "WHERE :user.email = :email";
            Query query = entityManager.createQuery(queryString);
            System.out.println("debug --- b");
            query.setParameter("email", email);
//            List al = new ArrayList(query.getResultList());
//            return (Users)al.get(0);
            List<?> list = query.getResultList();
            System.out.println("debug --- c");
            if(list == null || list.size() == 0) throw new UsernameNotFoundException("User not found");
           Users user = (Users)list.get(0);
           System.out.println("debug --- d");
           System.out.println(user.getEmail());
           return user;
//            return (Users)list.get(0);

        }