*
     * @param jarUrl the URL of the JAR file (must not be {@literal null})
     * @return a <code>JarFile</code> to read the JAR file specified by the URL
     */
    public static JarFile toJarFile(final URL jarUrl) {
        assertArgumentNotNull("jarUrl", jarUrl);

        final URLConnection con = URLUtil.openConnection(jarUrl);
        if (con instanceof JarURLConnection) {

         * @param rootDir
         *            The root directory.
         */
        public JarFileTraverser(final URL url, final String rootPackage, final String rootDir) {
            this(JarFileUtil.toJarFile(url), rootPackage, rootDir);
        }

        @Override
        public boolean isExistClass(final String className) {