在自己的测试中，对同一个对象连续进行两次update时会报：org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session这个错，在网上找了下原因，原来是在hibernate中同一个session里面有了两个相同标识但是是不同实体。
解决的办法是把session.update(action)；换成session.merge(action);这样就不会报错了。
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