Javaプログラムでjarファイルを生成する@Java

   public static void main(String[] args) {
        ProcessBuilder pb = new ProcessBuilder("jar", "-cvf", "./sample.jar", SOURCES);
        try {
            Process proc = pb.start();
            int resultCode = proc.waitFor();
            System.out.println(resultCode);
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }