Send Object through Socket

Question

Hi,
I am trying to send an object from Server to Client but the ObjectInputStream.readObject() on the client blocks.
net beans Project can be found Here .
Why it doesn't work?
Thanks,
Itay

Answer 1

The Server works fine... it waits for a second client after the first one get connected
I will post here the code.
Server Code
public class MemoryServer
    private final static int DEFAULT_BOARD_SIZE = 4;
    private ServerSocket socket;
     * Starting the server
     * @param n integer to determine the size of the board (must be even) the board will be n*n.
     * @param port the port on which the server will listen for incoming requests
    public void startServer(int n, int port)
        try
            socket = new ServerSocket(port);
        catch (IOException e)
            e.printStackTrace();
            System.exit(1);
        while(true)
            System.out.println("Listening on port " + port);
            Socket firstPlayerSocket = null, secondPlayerSocket = null;
            try
                firstPlayerSocket = socket.accept();
                System.out.println("First Player Socket Open: " + firstPlayerSocket.getInetAddress() + ":" + firstPlayerSocket.getPort());
                MemoryGame game = new MemoryGame(n, firstPlayerSocket);
                secondPlayerSocket = socket.accept();
                System.out.println("Second Player Socket Open: " + secondPlayerSocket.getInetAddress() + ":" + secondPlayerSocket.getPort());
                game.setSecondPlayer(secondPlayerSocket);
                game.start();
            catch (IOException e1)
                try
                    e1.printStackTrace();
                    if (firstPlayerSocket != null)
                        firstPlayerSocket.close();
                    if (secondPlayerSocket != null)
                        secondPlayerSocket.close();
                catch (IOException e2)
                    e2.printStackTrace();
public class MemoryGame extends Thread
    private Socket firstPlayerSocket, secondPlayerSocket;
    private ObjectOutputStream firstPlayerOut, secondPlayerOut;
    private ObjectInputStream firstPlayerIn, secondPlayerIn;
    private int boardSize;
    public MemoryGame(int boardSize, Socket firstPlayer) throws IOException
        this.boardSize = boardSize;
        firstPlayerSocket = firstPlayer;
        firstPlayerOut = new ObjectOutputStream(firstPlayerSocket.getOutputStream());
        firstPlayerOut.flush();
        firstPlayerIn = new ObjectInputStream(firstPlayerSocket.getInputStream());
        TextMessage message = new TextMessage("Waiting for opponent.");  //TextMesaage extends Message which implements Serializable
        firstPlayerOut.writeObject(message);
        firstPlayerOut.flush();
    public void setSecondPlayer(Socket secondPlayer) throws IOException
        try
            secondPlayerSocket = secondPlayer;
            secondPlayerOut = new ObjectOutputStream(secondPlayerSocket.getOutputStream());
            secondPlayerOut.flush();
            secondPlayerIn = new ObjectInputStream(secondPlayerSocket.getInputStream());
            TextMessage message = new TextMessage(Constants.GAME_START_MESSAGE);
            firstPlayerOut.writeObject(message);
            firstPlayerOut.writeObject(message);
        catch(IOException e)
            firstPlayerIn.close();
            firstPlayerOut.close();
            if (secondPlayerIn != null)
                secondPlayerIn.close();
            if (secondPlayerOut != null)
                secondPlayerOut.close();
            throw e;
    @Override
    public void start()
        endGame();
    private void endGame()
        try
            firstPlayerIn.close();
            firstPlayerOut.close();
            firstPlayerSocket.close();
            secondPlayerIn.close();
            secondPlayerOut.close();
            secondPlayerSocket.close();
        catch (IOException e)
            e.printStackTrace();
}Client Code
public class MemoryClient
    private Socket socket;
    public MemoryClient(String host, int port)
        try
            socket = new Socket(host, port);
            ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
            System.out.println("Connected to " + host + ":" + port);
            while (true)
                try
                    Message msg = (Message)in.readObject();
                    System.out.println("Recieved");
                    if (msg instanceof TextMessage)
                        TextMessage textMsg = (TextMessage)msg;
                        if (!textMsg.getText().equals(Constants.GAME_START_MESSAGE))
                            System.out.println(textMsg.getText());
                            break;
                        MemoryFrame gameFrame = new MemoryFrame(socket);
                        gameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                catch(Exception e)
                    e.printStackTrace();
        catch (IOException e)
            e.printStackTrace();
            System.exit(1);
}