After closing serversocket, process remains

Question

Hi everyone,
I'm trying to learn to write a client/server program. I begin by creating a serversocket and waiting for data. When I close the program, the serversocket still remains even when I create handlers that try to close the socket after the GUI has been closed.
The server is as follows:
try
               ServerSocket myServerSocket = new ServerSocket(6666);
               myServerSocket.setReuseAddress(true);
               writeToDebugger("Server successfully created.  Listening on port 6666\n");
               //     open a socket for listening for multiple requests
               while(listening)
                         clientSocket = myServerSocket.accept();
                         //clientSocket.setReuseAddress(true);
                         writeToDebugger("Client " + clientSocket.getInetAddress().toString() + " accepted.");
                         //store clientSocket information
                         out = new PrintWriter(
                                clientSocket.getOutputStream(), true);
                         in = new BufferedReader(
                                  new InputStreamReader(
                                      clientSocket.getInputStream()));
                         while ((inputLine = in.readLine()) != null && inputLine != "")
                              writeToDebugger(inputLine);
                         //breaker = inputLine.indexOf(',');
                         //store the incoming request's information --- username of requestor is first param, requested username is second param
                         //database.put(inputLine.substring(0, breaker), clientSocket.getInetAddress());
                         //return the IP address of the username lookup
                         //out.print(database.get(inputLine.substring(breaker+1)));     
          }Here is my closing handler:
public void windowClosed(WindowEvent arg0) {
          listening=false;
          try
               System.out.println("CLOSING FOR REAL");
               if(clientSocket!=null)
                    clientSocket.close();
                    clientSocket.shutdownInput();
                    clientSocket.shutdownOutput();
               if(myServerSocket!=null)
                    myServerSocket.close();
               if(out!=null)
                    out.flush();
                    out.close();
               if(in!=null)
                    in.close();
               System.out.println("DONE CLOSING");
          catch(Exception e)
               System.out.println(e.getMessage());
     }If someone could please tell me why I have to go into the task manager to close the process after I have already closed the GUI, I'd really appreciate it.
Thanks in advance,
Julian

Answer 1

And you're doing all these closes in the wrong order, and redundantly.
Just close 'out' and the ServerSocket, doesn't matter in what order here.
All the other closes and shutdowns are redundant. Calling shutdownXXX after closing the socket does nothing (and calling them just before closing the socket would add nothing to what close() already does). Closing the client socket before closing the output stream built around the socket output stream denies the output stream the chance to flush.