Simple TCP chat application half duplex not working for me

Question

I m having a problem in TCP application working half duplex
My friend runs client program who is in near by city and i run the server program in my system
Let my ip address is 116.x.y.z
My server program is
import java.net.*;
     import java.io.*;
     public class tcpserver
         public static void main(String args[]) throws IOException
          ServerSocket s1=null;
          try
             s1=new ServerSocket(98);
          catch(IOException e)
             System.err.println("Could not find port 98");
             System.exit(1);
          Socket c=null;
          try
             c=s1.accept();
             System.out.println("Connection from"+c);
                                  catch(IOException e)
             System.out.println("Accept failed");
             System.exit(1);
          PrintWriter out=new PrintWriter(c.getOutputStream(),true);
          BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
          System.out.println("I am ready,type now");
          String l=in.readLine();
          while(l!=null)
             out.println(l);
          out.close();
          in.close();
          c.close();
          s1.close();
     }The Client program is which my friend executes is
import java.net.*;
     import java.io.*;
     public class tcpclient
         public static void main(String arg[]) throws IOException
          Socket s=null;
          BufferedReader b=null;
          try
             s=new Socket(InetAddress.getByName("116.x.y.z"),98);
             b=new BufferedReader(new InputStreamReader(s.getInputStream()));
          catch(UnknownHostException u)
             System.err.println("I dont know host");
             System.exit(0);
          String inp;
          while((inp=b.readLine())!=null)
             System.out.println(inp);
             break;
          b.close();
          s.close();
     }Important Note: When i run this program specifying within my system its working ( i mean running the program in two different windows(terminals) its working for me)
When i give the client program to my friend its getting compiling for him but not running for him
Its showing him unknownhost exception and main method not found like this.
Please correct the above code or else just what kind of strategy we should follow in order to get rid of this problem
When i normally run this program in my system
the output when i run in my own system is
Output for running tcpserver.java
~\JDK2~1.0\bin>java tcpserver
Connection fromSocket[addr=/116.x.y.z,port=1930,localport=98] // in output i edit the ip address text
I am ready,type now
this is test text
Output for running tcpclient.java
~\JDK2~1.0\bin>java tcpclient
this is test text
My problem is its working in my system when it exceeds out the output is not available for me
Help me Please !!!

Answer 1

          String l=in.readLine();
          while(l!=null)
          out.println(l);
          }That will print the same thing forever. Make it the same as the loop in the client.
Important Note: When i run this program specifying within my system its working ( i mean running the program in two different windows(terminals) its working for me)Looping forever might be what you call 'working'. I don't.
Its showing him unknownhost exception and main method not found like this.Change this:
new Socket(InetAddress.getByName("116.x.y.z"),98)to this:
new Socket("116.x.y.z",98)although your friend may then run into connectivity problems ...