code: public boolean addCustomLogger(Logger logger)
    {
      if (logger.getClass().getName().startsWith("java"))
        return false;
      
      Logger oldLogger = _localLoggers.get();
  
      if (oldLogger != null)
        return false;
  
      _localLoggers.set(logger);
      
      if (_parent != null) {
        logger.setParent(_parent);
      }
  
      return true;
    }
docs: Sets a custom logger if possible