public class HibernateUtil { //copied from official Hibernate3 tutorial.

    public static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();

    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            // Store it in the ThreadLocal variable
            session.set(s);
        }
        return s;
    }

    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
}

org.hibernate.Session ss = HibernateUtil.currentSession();
Transaction tx = ss.beginTransaction();

ArrayList<SpecialAccount> accounts = null;
try{
   if (newRequest.updateDB()){
      owner = newRequest.getOwner();
      if(owner != null && owner.getCamsID()<1) owner.updateDB();
      newRequest.setMachines(machines);
      if(newRequest.checkAccountNameConflict()) throw new HibernateException("Account name already exists.");
      accounts = newRequest.generateAccounts();
                accounts.updateDB();
         
   }
   tx.commit();
   HibernateUtil.currentSession().flush();
   
}
catch(Exception e){
   if (tx != null) tx.rollback();
   return;
}
finally{
   HibernateUtil.closeSession();
}