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Hibernate version:

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Name and version of the database you are using:

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

Postings are sometimes meaningless, even when they should not be. ;)

I would guess that H updates a collection for the user even he-or-she did nothing with it.
So I guess the problem is that collection index was declared as persistent property on the entity in the collection ( probably List )...