Question

Client code:

try {
            Socket socket = new Socket(ip, port);
            OutputStream output = socket.getOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(output);
            InputStream input = socket.getInputStream();
            ObjectInputStream in = new ObjectInputStream(input);
            out.writeByte(1);
            FileHandler fh = (FileHandler) in.readObject();
            //processing stuff
            out.flush();
            out.close();
            output.flush();
            output.close();
            input.close();
            in.close();
            socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

Server code:

        try {
            ServerSocket server = new ServerSocket(port);
            Socket socket = server.accept();
            InputStream input = socket.getInputStream();
            ObjectInputStream in = new ObjectInputStream(input);
            int type = in.readByte();
            //processing stuff (which includes closing the streams and sending FileHandler object)
            socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

The server never receives the byte. It just waits for the byte from the client, and it never comes. I’m not sure why it isn’t sending, or getting received. Any help is much appreciated.

Answer 1

If I had to make a guess it’s because in your client you block on in.readObject(); waiting for the server to send you something thus never flush the output stream thus … nothing ever gets sent.

Move your read to after you flush your output stream.