code: @Override
      protected String resolveCodeWithoutArguments(String code, Locale locale) {
          String result = null;
          for (int i = 0; result == null && i < this.basenames.length; i++) {
              ResourceBundle bundle = getResourceBundle(this.basenames[i], locale);
              if (bundle != null) {
                  result = getStringOrNull(bundle, code);
              }
          }
          return result;
      }
docs: Resolves the given message code as key in the registered resource bundles,
  returning the value found in the bundle as-is (without MessageFormat parsing).