Java DatagramSocket send Object to UDP server

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Main {

   public static void main(String[] args) {
      try {//from  w  w  w  .  ja  va  2  s  . c  om
         // Create a DatagramSocket
         DatagramSocket socket = new DatagramSocket();
         // Create a Message object to be sent
         Message msg = new Message("Remainder", "Return my book on Monday");

         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         ObjectOutputStream oos = new ObjectOutputStream(baos);
         oos.writeObject(msg);
         byte[] out = baos.toByteArray();
         // Muticast group where packet has to sent
         InetAddress group = InetAddress.getByName(args[0]);
         // Port the receiver listens on
         int port = 8379;
         // Create a DatagramPacket with buffer, address and port
         DatagramPacket packet = new DatagramPacket(out, out.length, group, port);
         // Send the packet now
         socket.send(packet);
         System.out.println("Sent an object");
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}

class Message implements java.io.Serializable {
   String subject, text;

   Message(String s, String t) {
      this.subject = s;
      this.text = t;
   }

   String getSubject() {
      return subject;
   }

   String getText() {
      return text;
   }
}