I want to implement the pattern session-per-conversation described in this link: http://www.hibernate.org/42.html#A4
As you can see in the image,

the flush is executed only in the last transaction.
How can I implement this?
How can I finished the transaction T1? Should I execute t1.rollback()?

Nobody has implemented this pattern?

Take a loook at this link:
http://www.hibernate.org/43.html#A5

Don't forget to rate

Thank you for attention.
I've already looked this page, but my doubt persists.
I'm working in a swing application.
My main doubt is:

How can I finish the transaction T1? Should I execute t1.rollback()?

What about closing it and removing it from the (http) session ?
The filter will open a new one if it finds nothing in the http session.

Close transaction? The hibernate team tell to demarcate explicitly the transactions. So, probably there are only two options: commit or rollback the transaction.
I haven't http session or filters, because I'm working in a swing application without J2EE server.

don't understand your question/concern here.

just commit t1.

the assumption is that, because you use FlushMode.NEVER, Hibernate does not write anything to the database during that first transaction. Of course, that also assumes you don't explicitly call session.flush() yourself during t1.

Ok, this resolved the problem.
There was a bug in the code, that has setted the FlushMode to AUTO after I set to NEVER.