docs: public Logger getLogger(String name) {
          // the root logger is called "" in JUL
          if (name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) {
              name = "";
          }
  
          Logger slf4jLogger = loggerMap.get(name);
          if (slf4jLogger != null)
              return slf4jLogger;
          else {
              java.util.logging.Logger julLogger = java.util.logging.Logger.getLogger(name);
              Logger newInstance = new JDK14LoggerAdapter(julLogger);
              Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
              return oldInstance == null ? newInstance : oldInstance;
          }
      }