public List<File> getJarClassPath(File file) throws IOException {
        String parent = file.getParent();
        JarFile jarFile = new JarFile(file);
        try {
            Manifest man = jarFile.getManifest();
            if (man == null)
                return Collections.emptyList();

            Attributes attr = man.getMainAttributes();
            if (attr == null)
                return Collections.emptyList();

            String path = attr.getValue(Attributes.Name.CLASS_PATH);
            if (path == null)
                return Collections.emptyList();

            List<File> list = new ArrayList<File>();

            for (StringTokenizer st = new StringTokenizer(path); st.hasMoreTokens(); ) {
                String elt = st.nextToken();
                File f = (parent == null ? new File(elt) : new File(parent, elt));
                list.add(f);
            }

            return list;
        } finally {
            jarFile.close();
        }
    }