Create an UDP broadcast Sending agent in java

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Java

Mobile

Android

Hi all,
I am a newbie in java.
I am looking to broadcast a meesage in java from the client to all the listening servers.I dont want to broadcast to any particular machine hence i am 192.168.1.255 as the ip address in the code but still doesnot send the packets to the listening servers.However when i use a specific ip adress it just works fine.Code is as follows:

import java.io.*; 
import java.net.*; 

public class client {

	public static void main(String args[]) throws Exception    
	{      		
		while(true)
		{
		
		BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
		DatagramSocket clientSocket = new DatagramSocket(); 
		clientSocket.setBroadcast(true);
		
		InetAddress IPAddress = InetAddress.getByName("192.168.1.255"); 
		byte[] sendData = new byte[50];   
		byte[] receiveData = new byte[50];  
		String sentence = inFromUser.readLine();   
		sendData = sentence.getBytes();    
		DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length,new InetSocketAddress("192.168.1.255",9876)); 
		clientSocket.send(sendPacket); 
		DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);   
		clientSocket.receive(receivePacket); 
		String modifiedSentence = new String(receivePacket.getData());  
		System.out.println("FROM SERVER:" + modifiedSentence);   
		clientSocket.close();    
		}
	} 

}

Any help would really be appreciated.

Thanks in advance