I changed my client side gui application to Hibernate from db4o OODBMS. Hibernate seemed to work very well until I ran into the problem: Lazy collections cannot be accessed(throws exception) after a Session is closed. The Hibernate code stores a reference to the Session and you must explicity reassociate all persistent object references with the new Session before accessing the lazy collection. So...I tried to keep the Session open for the lifetime of the user Session but hibernate will not support this. Sessions have to be opened and closed with each unit of work. I also had issues with stale cache and that there is no simple way to clear or bypass the cache other than nullifying the Session which, in turn, caused the problem accessing lazy collections from a persistent object reference which was loaded from a Session which has been closed.
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