public class HibernateUtil {
   
    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
           Configuration configuration = (new
              Configuration()).configure();
           
           sessionFactory = configuration.buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            ex.printStackTrace();
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();
   
    /**
     * returns current session using thread-local
     * @return
     * @throws HibernateException
     */
    public static Session currentSession() throws HibernateException {
        org.hibernate.Session s = (org.hibernate.Session) session.get();
//        // Open a new Session, if this Thread has none yet
        if (s == null || !s.isOpen()) {
            s = sessionFactory.openSession();
            session.set(s);
        }
       
        return s;
    }

    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();

        if (s != null && s.isOpen()) {
            s.close();
            s = null;
        }       
    }

    /**
     * returns the current session using sessionfactory
     * @return
     */
    public static Session getCurrentSession() {
       return sessionFactory.getCurrentSession();
    }
   
    public static void closeSessionFactory(){
       sessionFactory.close();
    }
   
    public static boolean isOpenSession(){
       return ((org.hibernate.Session)session.get())!=null &&
             ((org.hibernate.Session)session.get()).isOpen() ;
    }

}