本文参考自：https://cristian.sulea.net/blog.php?p=2014-06-28-hibernate-exception-a-collection-with-cascade-all-delete-orphan-was-no-longer-referenced-by-the-owning-entity-instance本文参考自：https://cristian.sulea.net/blog.php?p=201
阅读背景：
HibernateException - A collection with cascade="all-delete-orphan" was no longer referenced by the o
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