read write from server and client both side in eclipse

Question

I've the code for server and client classes. I've two classes, ServerApp working as server and ClientApp working as client in my local machine.

I first run the ServerApp class and then the ClientApp class. After running the ClientApp class I write some message in the eclipse console "Hello Server" then the message is printed in ServerApp console displaying the client message.

But when I run the ServerApp class and write some text in console and running the ClientApp does not display any message in the console.

I can not understand how to show two way message communication in eclipse console? Please suggest how I can perform two way communication (client server) in eclipse.

Server App

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

public class ServerApp {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        try {
            ServerSocket Server_Socket;
            Server_Socket = new ServerSocket(5555);

            Socket clientSocket = null;
            clientSocket = Server_Socket.accept();

            DataInputStream input;
            input = new DataInputStream(clientSocket.getInputStream());
            System.out.println(input.readUTF());

            DataOutputStream output;
            output = new DataOutputStream(clientSocket.getOutputStream());

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            String str = "", str2 = "";
            while (!str.equals("stop")) 
            {
                str = input.readUTF();
                System.out.println("client says: " + str);
                str2 = br.readLine();
                output.writeUTF(str2);
                output.flush();
            }
            input.close();
            clientSocket.close();
            Server_Socket.close();

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

    }

}

Client App

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

public class ClientApp {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            Socket Client_Socket;
            Client_Socket = new Socket("localhost", 5555);

            DataInputStream input;
            input = new DataInputStream(Client_Socket.getInputStream());

            DataOutputStream output;
            output = new DataOutputStream(Client_Socket.getOutputStream());

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            String str = "", str2 = "";
            while (!str.equals("stop")) {
                str = br.readLine();
                output.writeUTF(str);
                output.flush();
                str2 = input.readUTF();
                System.out.println("Server says: " + str2);
            }

            output.flush();
            output.close();
            Client_Socket.close();
        } catch (Exception e) {
            System.out.println(e);
        }

    }

}