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a different object with the same identifier value was already associated with th

 
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1、a different object with the same identifier value was already associated with the session。
  错误原因:在hibernate中同一个session里面有了两个相同标识但是是不同实体。
  解决方法一:session.clean()
  PS:如果在clean操作后面又进行了saveOrUpdate(object)等改变数据状态的操作,有可能会报出"Found two representations of same collection"异常。
  解决方法二:session.refresh(object)
  PS:当object不是数据库中已有数据的对象的时候,不能使用session.refresh(object)因为该方法是从hibernate的session中去重新取object,如果session中没有这个对象,则会报错所以当你使用saveOrUpdate(object)之前还需要判断一下。
  解决方法三:session.merge(object)
  PS:Hibernate里面自带的方法,推荐使用。
2、Found two representations of same collection
  错误原因:见1。
  解决方法:session.merge(object)
以上两中异常经常出现在一对多映射和多对多映射中
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