hello,
sorry for asking a basic question, but I have not found any answer for it anywhere...

I have a detached object on which I have made alterations after the session was closed. The object contains a collection of other objects, and I have added one object to that collection.
When I create a new session, do a saveOrUpdate on the detached object and commits the transaction, the object (with changes to it's collection) is saved to the database. How come? I thought it was only possible to save persistent objects!?

Any help or links to relevant documentation would be highly appreciated.

best regards,
kenny

According to the Hibernate in Action book ,
calling update on a detached object will reassociate the detached instance to the new session and tells Hibernate to treat the object as dirty.
So the object being dirty its persistant state will be updated if changes exist

Again that's my undrestanding