При попытке проверить задание через IntelliJ IDEA выдаёт ошибку:
Кто-нибудь сталкивался с таким? Как лечить?
package com.javarush.task.task30.task3008;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Server {
private static Map<String, Connection> connectionMap = new ConcurrentHashMap<>();
private static class Handler extends Thread {
private Socket socket;
public Handler(Socket socket) {
this.socket = socket;
}
private String serverHandshake(Connection connection) throws IOException, ClassNotFoundException {
while (true) {
connection.send(new Message(MessageType.NAME_REQUEST));
Message response = connection.receive();
MessageType type = response.getType();
String name = response.getData();
if ((type == MessageType.USER_NAME) &&
(name != null) &&
(!name.equals("")) &&
(!connectionMap.containsKey(name))) {
connectionMap.put(name, connection);
connection.send(new Message(MessageType.NAME_ACCEPTED));
return name;
}
}
}
private void notifyUsers(Connection connection, String userName) throws IOException {
for (String name : connectionMap.keySet()) {
if (!name.equals(userName)) {
connection.send(new Message(MessageType.USER_ADDED, name));
}
}
}
private void serverMainLoop(Connection connection, String userName) throws IOException, ClassNotFoundException {
while (true) {
Message message = connection.receive();
if (message.getType() == MessageType.TEXT) {
sendBroadcastMessage(new Message(MessageType.TEXT, userName + ": " + message.getData()));
} else {
ConsoleHelper.writeMessage("Получен неверный запрос от пользователя.");
}
}
}
public void run() {
ConsoleHelper.writeMessage("Установлено новое соединение с адресом: " + socket.getRemoteSocketAddress().toString());
String userName = null;
try (Connection connection = new Connection(socket)) {
userName = serverHandshake(connection);
sendBroadcastMessage(new Message(MessageType.USER_ADDED, userName));
notifyUsers(connection, userName);
serverMainLoop(connection, userName);
} catch (IOException | ClassNotFoundException e) {
ConsoleHelper.writeMessage("Ошибка при обмене данными с адресом: " + socket.getRemoteSocketAddress().toString());
} finally {
if(userName != null) {
connectionMap.remove(userName);
sendBroadcastMessage(new Message(MessageType.USER_REMOVED, userName));
}
ConsoleHelper.writeMessage("Закрыто соединение с адресом: " + socket.getRemoteSocketAddress().toString());
}
}
}
public static void sendBroadcastMessage(Message message) {
for (Map.Entry<String, Connection> entry : connectionMap.entrySet()) {
try {
entry.getValue().send(message);
} catch (IOException e) {
ConsoleHelper.writeMessage("Невозможно отправить сообщение пользователю " + entry.getKey());
}
}
}
public static void main(String[] args) {
int port = ConsoleHelper.readInt();
try (ServerSocket socket = new ServerSocket(port)) {
ConsoleHelper.writeMessage("Сервер запущен.");
while (true) {
Handler handler = new Handler(socket.accept());
handler.start();
}
} catch (IOException e) {
ConsoleHelper.writeMessage(e.getMessage());
}
}
}