Hibernate Session is closed

You can use this annotation on your controller method:

@Transactional(readOnly = true)

Update: I guess that calling getCurrentSession() does not guarantee that the session is actually open. For the very first time, you should use

Session session = this.getSessionFactory().openSession();
session.beginTransaction();

instead. This suggestion is actually consistent with the page you found.

Earlier:

Based on the information available so far, we can conclude that the cause of the error is the session not being open ;-)

I think I found the answer in:

Session is Closed

I am yet to implement it