code: public void rollback() throws HibernateException {
  		Transaction tr = (Transaction) SessionFactoryHolder.getTransaction();
  		if (tr != null) {
  			tr.rollback();
  		}
  		SessionFactoryHolder.setTransaction(null);
  	}
docs: /* (non-Javadoc)
  @see com.jdon.model.crud.hibernate.SessionProvider#rollback()