code: public void debug(String loggerFqcn, Object message, Throwable t) {
          doLog(Level.DEBUG, loggerFqcn, message, null, t);
      }
docs: Issue a log message and throwable with a level of DEBUG and a specific logger class name.
  
  @param loggerFqcn the logger class name
  @param message the message
  @param t the throwable