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

public class EchoServer 
{ 
 public static void main(String[] args) throws IOException 
   { 
    DatagramSocket serverSocket; 

    try { 
         serverSocket = new DatagramSocket(10007); 
        } 
    catch (IOException e) 
        { 
         System.err.println("Could not create socket on port: 10007."); 
         System.exit(1); 
	 return;
        } 

    DatagramPacket myPacket = new DatagramPacket(new byte[1000], 1000);
    System.out.println ("Waiting for message.....");

    while (true) 
        { 
         serverSocket.receive(myPacket);
	 System.out.println("Received the message: " + new String(myPacket.getData()));
         serverSocket.send(myPacket);
	}

   } 
}