Failed Server-Client communication

[susanmg]

I hve written a server program & a client program. The server is supposed to echo watever is typed in the client. I hve to get 16 values to be echoed. I hve created a string and all the values are added to this string. When I pass the string to the server, it doesn get echoed by the server. In fact server hangs @ tat part after establishing connection with the client. I am at my wits end!Can someone explain why it hangs when its supposed to echo the value in server?

SERVER PROGRAM:

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

public class AS3{
    public static void main(String[] args ){
        int i = 1;
        try{
             ServerSocket s = new ServerSocket(9001);

             for (;;){
                 Socket incoming = s.accept( );
                 System.out.println("Spawning " + i);
                 new RealEchoHandler(incoming, i).start();
                 i++;
             }
        } catch (Exception e){ System.out.println(e); }
    }
}

class RealEchoHandler extends Thread{
	DataInputStream in;
	DataOutputStream out;
	private Socket incoming;
    private int counter;

    public RealEchoHandler(Socket i, int c){
        incoming = i;
        counter = c;
    }

    public void run(){
        try {

            in = new DataInputStream(incoming.getInputStream());
			out = new DataOutputStream(incoming.getOutputStream());

            boolean done = false;
            String str="";
            out.writeUTF("Connected!\n");
            out.flush();
            while (!done){
				out.writeUTF(">");
				out.flush();
                str = in.readUTF();
                System.out.println(in+":"+str);
                if (str == null)
                    done = true;
                else{
                    out.writeUTF("Echo (" + counter + "): " + str+"\n");
                    out.flush();
                }
            }

            incoming.close();
         } catch (Exception e){
             System.out.println(e);
         }
    }


}

CLIENT:

 import java.io.*;
import java.net.*;
import java.util.*;
class Client3{
	public static void main(String[] args) {
		String store="";
		String clientCar="";
		String clientBranch="";
		String clientDriver="";
		String clientPasswd="";

		DataOutputStream out;
		DataInputStream in;
		try {
		    Socket t = new Socket("127.0.0.1", 9001);

            in = new DataInputStream(t.getInputStream());
            out = new DataOutputStream(t.getOutputStream());
            BufferedReader br = new BufferedReader
                     (new InputStreamReader(System.in));
            boolean more = true;
			System.out.println(in.readUTF());
            while (more) {
				clientCar = in.readUTF();
                clientBranch = in.readUTF();
				clientDriver = in.readUTF();
				clientPasswd = in.readUTF();
                store = store + clientCar+clientBranch+clientDriver+clientPasswd;
			    
                out.flush();
				store = in.readUTF();
                if (store == null)
                    more = false;
                else
                    out.writeUTF(store + "\n");
            }

         } catch(IOException e){
			    System.out.println("Error" + e);
	     }
	     System.out.println(store);
     }
}