identifier of an instance of xx.entity was altered from xxKey@249e3cb2 to xxKey@74e8f4a3; nested exception is org.hibernate.HibernateException: identifier of an instance of xxentity was altered from错误

用entityManager保存数据时报错如下

identifier of an instance of xx.entity was altered from xxKey@249e3cb2 to xxKey@74e8f4a3; nested exception is org.hibernate.HibernateException: identifier of an instance of xxentity was altered from xxKey@249e3cb2 to xxKey@74e8f4a3

一共存了三张表的数据，使用了事务，前面两张表存各存1条数据，最后一张表存两条数据。执行完成后报上面的错误。后来把最后一张表实体上的联合主键去掉不报错，但最后一张表只保存成功1条数据

太奇怪了。怀疑是事务引起，检查了是使用的

 @Transactional(propagation = Propagation.SUPPORTS, rollbackFor = Exception.class)

写了单元测试，单独插入最后一张表两条数据可以成功插入。

最后找到问题关键，是因为最后一张表的其中一条数据是从数据库里读取出来的，另外一条是新插入的。把读取的数据copy到新new的实体后问题解决。

原因分析处于Persistent状态的实体的id, hibernate是不允许修改后双保存回去。

巴特西

identifier of an instance of xx.entity was altered from xxKey@249e3cb2 to xxKey@74e8f4a3; nested exception is org.hibernate.HibernateException: identifier of an instance of xxentity was altered from错误

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