docs: protected void addRequiredPath(String requiredPath) {
          if(requiredPath == null) {
              throw new IllegalArgumentException("Required path can't be null.");
          }
          DefaultOperationRequestAddress requiredAddress = new DefaultOperationRequestAddress();
          CommandLineParser.CallbackHandler handler = new DefaultCallbackHandler(requiredAddress);
          try {
              ParserUtil.parseOperationRequest(requiredPath, handler);
          } catch (CommandFormatException e) {
              throw new IllegalArgumentException("Failed to parse nodeType: " + e.getMessage());
          }
          addRequiredPath(requiredAddress);
      }