ssh连接oracle做登陆，遇到了空指针

Question

我就做了一个简单的连接数据库登陆，求大神帮忙啊啊啊

代码

public class UserDaoImpl implements UserDao{

//查询验证用户是否存在
private SessionFactory sessionFactory;

public SessionFactory getSessionFactory() {
    return sessionFactory;
}

public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}

@Override
public User checkUser(User user) {
    Session session=sessionFactory.openSession();
    //SQL查询语句
    String hql = "from UserInfo where username = ? and password = ? ";
    //将查询出的结果放在list  
    Query query= session.createQuery(hql);
    query.setString(1, user.getUsername());
    query.setString(2, user.getPassword());
    List<User> users=query.list();
    //判断查询结果的第一个值
    if(users.size()>0){
        return users.get(0);
    }else{
        return null;
    }
}

}

Answer 1

哪里空指针，是30行吗？ 26行和27行应该改成0和1，我记得下标是从0开始