docs: public static long getLong ( Properties props, String key, long def ) {
          String s = props.getProperty(key);
          if ( s != null ) {
              try {
                  def = Long.parseLong(s);
              }
              catch ( NumberFormatException nfe ) {
                  log.error("Not a number", nfe);
              }
          }
          return def;
      }