public static void save(User user) {
    Session session = null;
    Transaction transaction = null;
    try {
        session = HibernateUtils.getSession();
        transaction = session.beginTransaction();

        session.save(user);

        transaction.commit();
    } catch (Exception e) {
        e.printStackTrace();
        if (transaction != null) {
            transaction.rollback();
        }
    } finally {
        HibernateUtils.closeSession(session);
    }
}

public static User get(String id) {
    if (id == null || id.length() == 0) {
        return null;
    }
    Session session = null;
    Transaction transaction = null;
    User user = null;
    try {
        session = HibernateUtils.getSession();
        transaction = session.beginTransaction();

        user = (User) session.get(User.class, id);

        transaction.commit();
    } catch (Exception e) {
        e.printStackTrace();
        if (transaction != null) {
            transaction.rollback();
        }
    } finally {
        HibernateUtils.closeSession(session);
    }
    return user;
}