}

    // Helper method to create test JAR with XML content
    private void createTestJarWithXml(File jarFile, String xmlContent) throws Exception {
        try (JarOutputStream jos = new JarOutputStream(new FileOutputStream(jarFile))) {
            JarEntry entry = new JarEntry("fess_ds++.xml");
            jos.putNextEntry(entry);
            jos.write(xmlContent.getBytes());
            jos.closeEntry();

    Closer closer = Closer.create();
    try {
      FileOutputStream fileOut = closer.register(new FileOutputStream(jarFile));
      JarOutputStream jarOut = closer.register(new JarOutputStream(fileOut, manifest));
      for (String entry : entries) {
        jarOut.putNextEntry(new ZipEntry(entry));
        Resources.copy(ClassPathTest.class.getResource(entry), jarOut);