public static byte[] objectToBytes(Object o){
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        ObjectOutputStream objectOutputStream = null;
        try {
            objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
            objectOutputStream.writeObject(o);
            objectOutputStream.flush();
            return byteArrayOutputStream.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                byteArrayOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    public static Object bytesToObject(byte[] b){
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(b);
        ObjectInput objectInput = null;
        try {
            objectInput = new ObjectInputStream(byteArrayInputStream);
            return objectInput.readObject();
        } catch (Exception e){

        } finally {
            try {
                if (objectInput != null) {
                    objectInput.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return null;
    }