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

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Hibernate上的一个经典错误:a different object with the same identifier value was already associated with the session:。。。。

   今天在学习Hibernate一对多双向映射时碰到了这样的一个错误,几经调试。找出来了原因。持久化类的代理主键类型要设成包装类型。原因很简单,就是基本类型在给没有初值的变量初始化的时候会给初值0,这样就造成Hibernate的Session会存在相同的OID同时为0的游离态的对象。而包装类型没有初值时的默认值为NULL
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