docs: public static long getLong( String key, long def ) {
          String s = prp.getProperty( key );
          if( s != null ) {
              try {
                  def = Long.parseLong( s );
              } catch( NumberFormatException nfe ) {
                  if( log.level > 0 )
                      nfe.printStackTrace( log );
              }
          }
          return def;
      }