Java Utililty Methods Jar File Find

File file = getClassFile(clazz);
String path = file.getPath();
final int idx = path.lastIndexOf('!');
if (idx == -1) {
    return null;
String jarFilePath = path.substring(0, idx);
if (jarFilePath.startsWith("file:\\")) {
...

String resName = clazz.getName();
resName = "/" + resName.replace('.', '/') + ".class";
URL classURL = clazz.getResource(resName);
if (classURL == null)
    return null;
String jarHeader = "jar:file:";
String urlString = classURL.toString();
if (!urlString.startsWith(jarHeader))
...

String result = null;
if (clazz != null) {
    String me = clazz.getName().replace(".", "/") + ".class";
    URL dirURL = clazz.getClassLoader().getResource(me);
    if (dirURL.getProtocol().equals("jar")) {
        result = dirURL.getPath().substring(5, dirURL.getPath().indexOf("!"));
return result;

URL jarUrl = (clazz.getProtectionDomain().getCodeSource() == null ? null
        : clazz.getProtectionDomain().getCodeSource().getLocation());
File jarFile = null;
if (jarUrl != null) {
    jarFile = getFile(jarUrl);
    if (!jarFile.isFile()) {
        jarFile = null;
return jarFile;

final URL resUrl = loader.getResource(MANIFEST);
if (!resUrl.getProtocol().equals("jar")) {
    throw new RuntimeException("Should run as jar");
final String path = resUrl.getPath();
if (!path.startsWith("file:")) {
    throw new RuntimeException("Unknown jar path: " + path);
final String jarPath = path.substring("file:".length(), path.indexOf('!'));
try {
    return new JarFile(URLDecoder.decode(jarPath, "UTF-8"));
} catch (UnsupportedEncodingException e) {
} catch (IOException e) {
return null;

String dir = ClassLoader.getSystemResource(classPath).toString();
try {
    dir = URLDecoder.decode(dir, "UTF-8");
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
dir = dir.replace('\\', '/');
if (dir.startsWith("jar:"))
...

final URL jarUrl = clazz.getResource("/" + resourceName);
final JarURLConnection connection = (JarURLConnection) jarUrl.openConnection();
final URL url = connection.getJarFileURL();
final File jarFile = new File(url.getFile());
return new JarFile(jarFile);

File currentJar = urlToFile(clazz.getProtectionDomain().getCodeSource().getLocation());
return currentJar;

String path = Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath();
if (path.endsWith(".jar"))
    path = path.substring(0, path.lastIndexOf("/"));
return path;

return url2File(classFromJar.getProtectionDomain().getCodeSource().getLocation()).getAbsolutePath();