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I use jta.
I get session: session = getSessionFactory().getCurrentSession();
Hibernate version: 3.0

How can I create a new session in my ejb ?
I dont want to go to the view and cause a new session to be created.

Have you looked at this?
- http://forum.hibernate.org/viewtopic.php?t=939039

Ups. Wrong previous post.

What's wrong with SessionFactory.openSession()?

jta assigns a hibernate session to the whole request that was sent from view.
In the middle of transaction, I could close the session but I could not open a new session.

What do you mean you cannot open new session?
Who provides a transaction for your request?

Otherwise SF.getCurrentSession() doesn't work, if there is no underlaying transaction.

There is no problem for you to open a new session - SF.openSession(). It will still be a part of previous transaction.
You can even open a new transaction, suspending the current and later on resume with it.