@Override
    public User isLogin(String username,String password) {

        User user=null;
        session.beginTransaction();
        String hql=("from User u where u.username=? and u.password=?"); 
        Query query=session.createQuery(hql);
        query.setString(0,username);
        query.setString(1,password);
        if(query.list().size()>0)
        {
            user=(User)query.list().get(0);
        }
        session.getTransaction().commit();
        return user;
    }