private
    fun createJar(classGraph: ClassGraph, classesDir: File, manifestFile: File, jarFile: File) {
        try {
            JarOutputStream(BufferedOutputStream(FileOutputStream(jarFile))).use { jarOutputStream ->
                if (manifestFile.exists()) {
                    jarOutputStream.addJarEntry(JarFile.MANIFEST_NAME, manifestFile)
                }
                val visited = linkedSetOf<ClassDetails>()

    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);

    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);