}

      // Find URL pointing to base of class path.
      String urlString = finalizerUrl.toString();
      if (!urlString.endsWith(finalizerPath)) {
        throw new IOException("Unsupported path style: " + urlString);
      }
      urlString = urlString.substring(0, urlString.length() - finalizerPath.length());
      return new URL(finalizerUrl, urlString);
    }