This might sound like a stupid question, and I know it is not recommended practice at all, but I have to deal with "foreign" source code here and am trying to determine wether I need to fix it or not:

How does Hibernate handle transactions, that are neither commited nor rolled back, although the related Hibernate session is closed ?
Is there some kind of cleanup inside of Hibernate that handles "unreleased" transactions, or will this lead to problems, e.g. memory leaks ?

Thanks in advance for any helpful input

Gordon