Is the problem in java.net or something else?

Question

Java

I am writing a simple chat. There is a client and a server, each of them accepts and writes to the socket. But for some unknown reason, the server does not work as it should. By the condition above msg = null.

public void setNet(){
        try {
            ServerSocket serverSocket = new ServerSocket(5000);
                while (true){
                    System.out.println("while working");
                    Socket socket = serverSocket.accept();
                    InputStreamReader streamReader = new InputStreamReader(socket.getInputStream());
                    BufferedReader reader = new BufferedReader(streamReader);
                    msg = reader.readLine();
                    System.out.println(msg);
                    System.out.println("reader working");
                        if(msg != null){
                            writer = new PrintWriter(socket.getOutputStream());
                            writer.println(msg);
                            System.out.println("writer working");
                            writer.flush();
                            writer.close();
                         }
                         else {
                            System.out.println("msg = null");
                        }
                }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

If you comment out the line msg = reader.readLine(); then everything works fine.

Answer 1

reader.readLine() waits for the end of the line to read it and you don't send it from the client.