Hibernate version:2

I have a pojo with a Set in it (an association). When I add an entry X to the Set and the transaction commit()s, everything is fine.

But when an exception occurs (application exception, not db-exception) and the transaction is rollback()ed, my pojo stil has the new entry in it (as expected). When the pojo is updated later, this new object is not saved to the db.

What is the best way to re-initialize (rollback) the Set, so that I can add X again and retry the transaction?

There is no rollback for the object graph and it is very important to close the session after an exception. if you are doing this, you should have no problems on the second save . you are on your own if you do not throw the tainted Session away.