docs: public static void main(String[] args) throws IOException {
          if (args.length != 1) {
              System.out.println("There should be an argument: path to a jar.");
              System.exit(0);
          }
          String jarInput = args[0];
          extract(new File(jarInput), new File("/tmp/junit-ekstazi-agent.jar"),
                  new String[] { Names.EKSTAZI_PACKAGE_BIN }, new String[] {});
          for (String name : extractClassNames("/tmp/junit-ekstazi-agent.jar")) {
              System.out.println(name);
          }
      }