Не получается отправить через сокеты больше 1 сообщения java

public class Client { private static final int PORT = 8000;
 
public static void main(String[] args) throws Exception {
    Socket clientSocket = new Socket(InetAddress.getLocalHost(), PORT);
    var reader = startInputService(clientSocket);
    var writer = startOutputService(clientSocket);
    String in = reader.readLine();
    System.out.println(in);
    Scanner scanner = new Scanner(System.in);
    String out = scanner.nextLine();
    writer.write(out);
 
    System.out.println(reader.readLine());
 
    writer.close();
    reader.close();
    clientSocket.close();
}
 
private static BufferedWriter startOutputService(Socket clientSocket) throws Exception {
    return new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
}
 
private static BufferedReader startInputService(Socket clientSocket) throws Exception {
    return new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}
}

public class Server { private static final int PORT = 8000;
 
public static void main(String[] args) throws Exception {
    startConnection();
}
 
private static void startConnection() throws Exception {
    var serverSocket = new ServerSocket(PORT);
    while (true) {
        Socket clientSocket = serverSocket.accept();
        var reader = startInputService(clientSocket);
        var writer = startOutputService(clientSocket);
 
        String out = "Guess the number\n";
        writer.write(out);
        writer.flush();
 
        String in = reader.readLine();
        System.out.println(in);
 
        //с этого момента код не работает
        writer.write("test");
 
        writer.close();
        reader.close();
    }
}
private static BufferedWriter startOutputService(Socket clientSocket) throws Exception {
    return new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
}
 
private static BufferedReader startInputService(Socket clientSocket) throws Exception {
    return new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}
}