docs: public Logger getLogger(String name) {
          Logger slf4jLogger = loggerMap.get(name);
          if (slf4jLogger != null) {
              return slf4jLogger;
          } else {
              org.apache.log4j.Logger log4jLogger;
              if (name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME))
                  log4jLogger = LogManager.getRootLogger();
              else
                  log4jLogger = LogManager.getLogger(name);
  
              Logger newInstance = new Log4jLoggerAdapter(log4jLogger);
              Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
              return oldInstance == null ? newInstance : oldInstance;
          }
      }