a different object with the same identifier value was already associated with the session.

session.update（Object  object）方法来对数据库进行更新的。而该方法在执行时，如果在session的缓冲区中存在与传入对象object有相同id的PO对象的话，就会抛出a different object with the same identifier value was already associated with the session.

解决办法：

用hql的方式直接对数据库进行修改

super.queryHql("update Customer u set u.email = ? where u.id = ?", obj);

参考文章

http://excon.iteye.com/blog/1085591

本文出自 “一无所有-天行者” 博客，请务必保留此出处http://tianxingzhe.blog.51cto.com/3390077/1670923

a different object with the same identifier value was already associated with the session.

原文：http://tianxingzhe.blog.51cto.com/3390077/1670923