code: protected void initBundles() {
          if (commonBundle == null) {
              Locale locale = configuration.getLocale();
              this.commonBundle = ResourceBundle.getBundle(commonBundleName, locale);
              this.docletBundle = ResourceBundle.getBundle(docletBundleName, locale);
          }
      }
docs: Lazily initializes the bundles. This is (currently) necessary because
  this object may be created before the locale to be used is known.