How to find which jar file contains your class at 'runtime'

If you ever wanted to know which jar your class belongs, or wanted to access the meta-information from that jar file (such as certs from Manifest.mf etc.), here's how you can do it.

    public URL getJarURL() {
       URL clsUrl = getClass().getResource(getClass().getSimpleName() + ".class");
       if (clsUrl != null) {
           try {
               URLConnection conn = clsUrl.openConnection();
               if (conn instanceof JarURLConnection) {
                   JarURLConnection connection = (JarURLConnection) conn;
                   return connection.getJarFileURL();
               }
           }
           catch (IOException e) {
               throw new RuntimeException(e);
           }
       }
       return null;
   } 

This would work in most of the enterprisely Java environment (unless your classloader is hacked by some stupid framework in between), not sure if this would be valid under OSGi container.

Why in the name of programming I need to write such trivial hacks? O Java Module system (JSR277), I await you.

Note: This is the simplest way I could write, if you know smarter way, feel free to comment here.