Hi,
 Possibility:

> Box box = boxDao.findNextFreeBox(BoxType.STANDARD); //
Does this 'box' an existing persistent box, possibly with _version = 1?

> where boxDao.save() is only a wrapper to em.persist(object)
then this box should be merged. Attempted to persist() will hit the
DuplicateKey exception at database which is getting translated to
EntityExistsException to the application.


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