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再次碰到:a different object with the same identifier value was already associated wi

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这个错误我一共遇到过两次,一直没有找到很好的解决方案,这个错误产生原因相信大家都知道,因为在hibernate中同一个session里面有了两个相同标识但是是不同实体.
一开始按网上说的用session.merge(Object)报了一个错,可能是没有用好,改用 session.clear(); session.update(user);这样就OK了,
方法为:

package org.springframework.orm.hibernate3.support;
...
    public void modifyByMerge(User user) {
        Session session = getHibernateTemplate().getSessionFactory().
                          getCurrentSession();
        session.clear();
        session.update(user);
    }
...
项目用的是spring + hibernate所以得用getHibernateTemplate().getSessionFactory().getCurrentSession();得当前Session
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