When I look at the SessionFactory API for the openSession() method it states:

"Create database connection and open a Session on it. "

I am running in JBoss using a container managed connection pool. If i do something like:

Session session = sessionFactory.openSession();

and then look at the number of session in the pool that are in use it shows 0. This means that the statement in the API that says that openSessions() creates a database connection either isn't accurate or not as detailed as it should be.

At what point in application execution is a connection actually taken from the pool?