this.tx.commit();
if (this.tx != null) { this.tx.commit(); }
  private void _tearDown() {    try {      if (this.hs != null) {        this.tx.commit();        this.hs.close();      }    }    catch (HibernateException eH) {      String err = "unable to tearDown: " + eH.getMessage();      LOG.fatal(err);      throw new RuntimeException(err);    }  } // private void _tearDown()