Hibernate getCurrentSession() versus openSession()

getCurrentSession()

this means that you have ONE session for the whole web app.

Bear in mind, Sessions are not THREAD SAFE.

You should never use "one session per web app" - session is not a thread safe object - cannot be shared by multiple threads.

You should always use "one session per request" or "one session per transaction".

The advantage is returns a session bound to a context - you don't need to close this

SessionFactory.openSession()

always opens a new session that you have to close once you are done with the operations.

If you are using Spring to manage transactions you can configure them to open / close sessions along with the transactions

      Private Session sessionObj = null;
       private Session getHibSession() throws ORMException {
              SessionFactory sessionFactObj = null;
              try {
                     if (sessionObj != null) {
                           return sessionObj;
                     } else {
                           sessionFactObj = HibernateSessionFactory.getInstance().getSessionFactory(hibernateConfig);
                           sessionObj = sessionFactObj.openSession();
                           return sessionObj;
                     }
              } catch (HibernateException hibex) {
                     throw new Exception(hibex);
              } catch (RuntimeException rte) {
                     throw new Exception(rte);
              }
       }