Mutli threading in Server Socket giving error for parallel requests

Question

HI, I wrote a ServerSocketProgram.java which listens to client and receives data. I used multithreading on each request it receives . But when two clients parallelly send data the server is struck at the iStream.read() operation. I have given setSoTimeOut(20000) . So its giving me a socketTimeOut Exception .If I removed the time out , It gave SocketException : socket closed. And there's no response to the client.
Please tell me the reason for the above problem . The sample program is below.
while ((clientSocket=serverSocket.accept())!=null){
                    System.out.println("in side main "+clientSocket.getInetAddress());
                    Thread c= new Thread(new ServerSocketProgram(clientSocket));
                    c.setDaemon(true);
                    c.start();
The Constructor is :
public ServerSocketProgram(Socket clientSocket){
          this.socket = clientSocket;
          try {
               oStream =new DataOutputStream(socket.getOutputStream());
               iStream =new DataInputStream(socket.getInputStream());
          } catch (IOException e) {
               e.printStackTrace();
The run method :
public void run() { 
          int op=0;
          try {
               while ((op=iStream.read())!=0){
                    System.out.println(op);
               oStream.writeBytes("hi success ");
               oStream.flush();
          } catch (IOException e) {
               e.printStackTrace();
          try{
               oStream.close();
               iStream.close();
               socket.close();
          }catch(Exception e){
               e.printStackTrace();
Thanks in advance ,
Sow
Message was edited by:
sow_Yarr

Answer 1

Your end-of-stream test should be looking for -1, not zero. Zero is a possible data value, but you're probably never receiving it so you're never getting to the output statement following your read loop.