code: public static ResourceBundleWrapper getBundleInstance(String baseName, String localeID,
              ClassLoader root, boolean disableFallback) {
          if (root == null) {
              root = ClassLoaderUtil.getClassLoader();
          }
          ResourceBundleWrapper b;
          if (disableFallback) {
              b = instantiateBundle(baseName, localeID, null, root, disableFallback);
          } else {
              b = instantiateBundle(baseName, localeID, ULocale.getDefault().getBaseName(),
                      root, disableFallback);
          }
          if(b==null){
              String separator ="_";
              if(baseName.indexOf('/')>=0){
                  separator = "/";
              }
              throw new MissingResourceException("Could not find the bundle "+ baseName+separator+ localeID,"","");
          }
          return b;
      }
docs: This method is for super class's instantiateBundle method