java - kryonet 服务器在接收对象时崩溃

Question

我遇到 Kryonet 服务器在收到来自客户端的对象后崩溃的问题。服务器代码:

package com.qookie.miner_server;
import java.io.IOException;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryonet.Server;
import com.esotericsoftware.minlog.Log;
import com.qookie.miner_server.Packet.*;


public class MinerServer_Main {
    private Server server;

    public MinerServer_Main() throws IOException {
        this.server = new Server();
        RegisterPackets();
        server.addListener(new NetworkListener());
        server.bind(8888,8888);
        server.start();
    }

    private void RegisterPackets() {
        Kryo kryo = server.getKryo();
        kryo.register(Packet0LoginRequest.class);
        kryo.register(Packet1LoginAnswer.class);
        kryo.register(Packet2Message.class);

    }
    public static void main(String[] args) {
        try {
            new MinerServer_Main();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这是一个服务器监听器:

package com.qookie.miner_server;
import com.esotericsoftware.kryonet.Connection;
import com.esotericsoftware.kryonet.Listener;
import com.qookie.miner_server.Packet.*;

public class NetworkListener extends Listener {
    public void connected(Connection arg0) {
        System.out.println("[SERVER] Someone has connected");
    }

    public void disconnected(Connection arg0) {
        System.out.println("[SERVER] Someone has disconnected");
    }

    public void received(Connection c, Object o) {
        if (o instanceof Packet0LoginRequest) {
            Packet1LoginAnswer p = new Packet().new Packet1LoginAnswer();
            p.accepted = true;
            c.sendTCP(p);
        }

        if (o instanceof Packet2Message) {
            String message = ((Packet2Message) o).msg;
            System.out.println("[CLIENT] " + message);
        }
    }
}

这里是 Packet.java 文件:

package com.qookie.miner_server;

public class Packet {
    public class Packet0LoginRequest {
        public Packet0LoginRequest() {}
        public void init() {

        }
    };

    public class Packet1LoginAnswer {
        public boolean accepted;
        public Packet1LoginAnswer() {}
        public void init() {

        }
    };

    public class Packet2Message {
        public Packet2Message() {}
        public String msg;
        public void init() {

        }
    };

    public Packet() {

    }

}

当用户连接时，客户端发送 Packet0LoginRequest，服务器发回 Packet1LoginAnswer。当 Packet1LoginAnswer 中的 boolean 变量为真时，客户端开始从扫描器读取并发送新的 Packet2Message。但是服务器在收到 Packet0LoginRequest 时崩溃了。

这是崩溃日志: Server crash log

Answer 1

它认为 kryonet 无法加载您的构造函数。

以下方法对我有用:

public class Network {

    static public final int tcpPort = 54555;
    static public final int udpPort = 54777;

    // This registers objects that are going to be sent over the network.
    static public void register (EndPoint endPoint) {
        Kryo kryo = endPoint.getKryo();
        kryo.register(ServerResponse.class);
        kryo.register(ClientRequest.class); 

    }

    static public class ServerResponse {
    ...
       public ServerResponse(){
               super();
       }
...
    }

    static public class ClientRequest {
    ...
        public ClientRequest(){
               super();
        }
    ...
   }
...
}