[java] How to get the path of a running JAR file?

The only solution that works for me on Linux, Mac and Windows:

public static String getJarContainingFolder(Class aclass) throws Exception {
  CodeSource codeSource = aclass.getProtectionDomain().getCodeSource();

  File jarFile;

  if (codeSource.getLocation() != null) {
    jarFile = new File(codeSource.getLocation().toURI());
  }
  else {
    String path = aclass.getResource(aclass.getSimpleName() + ".class").getPath();
    String jarFilePath = path.substring(path.indexOf(":") + 1, path.indexOf("!"));
    jarFilePath = URLDecoder.decode(jarFilePath, "UTF-8");
    jarFile = new File(jarFilePath);
  }
  return jarFile.getParentFile().getAbsolutePath();
}

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