蛋疼的j2ee空指针异常

最近完成一个j2ee的网站项目，  遇到了下面这个问题

写一个登录类，保存登录用户的session 用户， 密码

package com.tyland.action;import java.sql.Array;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.classic.Session;
import com.opensymphony.xwork2.ActionSupport;
import com.tyland.domain.AccountType;
import com.tyland.dao.AccountTypeDao;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;public class LoginAction extends ActionSupport
{/***   gdcc  登陆页面逻辑*/private static final long serialVersionUID = 1059318446535409471L;private String password;private SessionFactory  sessionFactory;private String username;private Map session;private AccountType  loginUser;private AccountTypeDao   accountTypeDao;public AccountType getLoginUser() {return loginUser;}public void setLoginUser(AccountType loginUser) {this.loginUser = loginUser;}public Map getSession() {return session;}public void setSession(Map session) {this.session = session;}public SessionFactory getSessionFactory() {return sessionFactory;}public void setSessionFactory(SessionFactory sessionFactory) {this.sessionFactory = sessionFactory;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String execute() throws Exception{     return "loginsucess";          }
public String  login ()throws Exception{/*** *   不使用spring框架来进行登陆页面的注册*/Session session1 =  sessionFactory.openSession();String hql = "from AccountType u where u.username=? and u.password=?";Query query = session1.createQuery(hql);query.setParameter(0, username);query.setParameter(1, password);System.out.println(username);System.out.println(password);List   user = query.list();//     loginUser.setUsername("1221")；                                          
//    loginUser.setId(11111);
//     loginUser.setPassword("sdadsadas");
//调这个函数出现空指针异常this.loginUser =  this.accountTypeDao.startlogin(username, password);this.session.put("sessionUser", this.loginUser);if(user.size()>0){  session1.close();return "loginsucess";  }else{return "logout";}}}

 注释部分的空指针异常，非常奇怪！纠结！！！！

转载于:https://www.cnblogs.com/pipicfan/archive/2012/06/12/2546664.html

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