logger.error ("doQuery(), query string from file is null");
if (logger.isErrorEnabled()) { logger.error("doQuery(), query string from file is null"); }
  protected Vector doQuery (String query_name, String a, String b) {    String query =       substituteList((String)fileParameters_.get(query_name), a, b);    if (query == null) {      logger.error ("doQuery(), query string from file is null");       return null;    } // if    Vector holdsQueryResult;    try {      holdsQueryResult = executeQuery(query);    } catch (Exception ee) {      logger.error ("doQuery(), DB query failed. query= "+ query+ "\n"+ee.toString());      return null;    } // try    return holdsQueryResult;  } // doQuery