Hi,

The basic problem is that you are trying to read a line of text from
both the server and client at the same time without sending a line
first. I.e server starts by waiting for a line of text and the client
also starts by waiting for a line of text, hence it hangs...

I modified the programs slighly so that the client starts by sending a
line of text until the user enters a null or empty line, in which case
the client closes the stream and socket. In this case the server will
also close down, in a real application you probably want to start a new
worker thread for each acceted client connection....

Regards,
Martin Lansler

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

public class Client {

   public static void main(String[] args) {
       Socket socket = null;
       PrintWriter out = null;
       BufferedReader in = null;
       BufferedReader user = null;
       try {
           String fromServer, fromUser;

           // Connect to server.
           socket = new Socket("localhost", 4444);

           // Out channel.
           out = new PrintWriter(socket.getOutputStream());

           // In channel.
           in = new BufferedReader(new
InputStreamReader(socket.getInputStream()));

           // Input from user.
           user = new BufferedReader(new
InputStreamReader(System.in));

           while (out != null) {
               fromUser = user.readLine();

               if (fromUser != null && !"".equals(fromUser)) {
                   out.println(fromUser);
                   out.flush();
                   fromServer = in.readLine();
                   System.out.println(fromServer);
               } else {
                   out.close();
                   out = null;
                   socket.close();
               }
           }

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

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

public class Server {

   public static void main(String[] args) {

       ServerSocket serverSocket = null;
       Socket ss = null;
       BufferedReader in = null;
       PrintWriter out = null;

       try {
           serverSocket = new ServerSocket(4444);

           System.out.println("CRAP1");
           ss = serverSocket.accept();
           System.out.println("CRAP2");
           //
           in = new BufferedReader(new
InputStreamReader(ss.getInputStream()));
           out = new PrintWriter(ss.getOutputStream());

           String bob = null;

           while ((bob = in.readLine()) != null) {
               System.out.println("CRAP3");
               out.println(bob + " from server");
               out.flush();
               System.out.println(bob);
           }
           serverSocket.close();
       }

       catch (IOException e) {
           e.printStackTrace();
       }
   }

}

Please refrain from multi-posting.

(X-post to c.l.j.p./h. w/ f-u to c.l.h.help only.)

Andrew T.