Hibernate “deleted entity passed to persist” issue with Cascade.DELETE_ORPHAN and parent/child relationship?

Delete orphan" means only that an object removed from a collection gets deleted. It doesn't take into account whether the object gets added to another collection. The flag is actually associated to the collection and not to individual objects.

Your experience agrees with that, as does the description of javax.persistence.OneToMany. OrphanRemoval which, by the way, has superceded CascadeType. DELETE_ORPHAN.

The latter is now deprecated.

Finally I found out the reason of this behavior by looking into the source code.

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