*
     * @param conn
     *            {@link JarURLConnection}. Must not be {@literal null}.
     * @return {@link JarFile}
     */
    public static JarFile getJarFile(final JarURLConnection conn) {
        assertArgumentNotNull("conn", conn);

        try {
            return conn.getJarFile();
        } catch (final IOException e) {

     *
     * @param artifact the theme artifact to install
     * @throws ThemeException if installation fails
     */
    public void install(final Artifact artifact) {
        final Path jarPath = getJarFile(artifact);
        final String themeName = getThemeName(artifact);
        if (logger.isDebugEnabled()) {
            logger.debug("Theme: name={}", themeName);
        }

        assertArgumentNotNull("jarUrl", jarUrl);

        final URLConnection con = URLUtil.openConnection(jarUrl);
        if (con instanceof JarURLConnection) {
            return JarURLConnectionUtil.getJarFile((JarURLConnection) con);
        }
        return create(new File(toJarFilePath(jarUrl)));
    }

    /**
     * Returns the path of the JAR file specified by the URL.
     *

                    final JarURLConnection jarURLConnection = (JarURLConnection) resource.openConnection();
                    try (JarFile jarFile = jarURLConnection.getJarFile()) {
                        final Enumeration<JarEntry> entries = jarFile.entries();
                        while (entries.hasMoreElements()) {
                            final JarEntry entry = entries.nextElement();