How to properly close and open a Hibernate session?

Question

I have the following method that inserts a large batch of records every few seconds. After some time of running I get errors like the following:

ERROR: C

Answer 1

    Transaction tx = session.beginTransaction();
    try {
        for (int i = 0; i < mesages.size(); i++) {
            Message message = messages.get(i);
            session.save(message);
            if (i % 75 == 0) { 
                // flush a batch of inserts and release memory:
                session.flush();
                session.clear();
            }
        }
        tx.commit();
    }catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        tx.rollBack();
    }finally{
        session.close();
    }
}