Sorry, this problem is resolved because I forgot to close the entityManager
of JPQL query

ZZflash wrote:
>
> Hi,all
>   When I get a pojo with subclass list by JPQL, then use the merge method
> of entityManager to update the infomation of it, an exception is thrown,
> the exception is about excute an insert sql statment error. Why there is
> an insert sql statment but not an update?
>

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