net.sf.hibernate.HibernateException: Illegal attempt to associate a collection with two open session
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这个问题的解决是，当手动的进行hibernate的事物控制时间，在同一个事物里面，就不要进行两个操作，一般是第一个操作是通过id查询对象，第二个操作是update这个对象，往往会报这个错误，这个时间，就不用第一个操作，直接从actionform中取出就可以了，然后在设置一些值，直接传给update方法就可以
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