public static ArrayList<ClassNode> loadClasses(final File jarFile) throws IOException {
        ArrayList<ClassNode> classes = new ArrayList<ClassNode>();
        ZipInputStream jis = new ZipInputStream(new FileInputStream(jarFile));
        ZipEntry entry;
        while ((entry = jis.getNextEntry()) != null) {
            try {
                final String name = entry.getName();
                if (name.endsWith(".class")) {
                    byte[] bytes = getBytes(jis);
                    String cafebabe = String.format("%02X%02X%02X%02X", bytes[0], bytes[1], bytes[2], bytes[3]);
                    if(cafebabe.toLowerCase().equals("cafebabe")) {
                        try {
                            final ClassNode cn = getNode(bytes);
                            classes.add(cn);
                        } catch(Exception e) {
                            e.printStackTrace();
                        }
                    } else {
                        System.out.println(jarFile+">"+name+": Header does not start with CAFEBABE, ignoring.");
                    }
                }

            } catch(Exception e) {

            } finally {
                jis.closeEntry();
            }
        }
        jis.close();
        return classes;
}