Question

I found this API called Kryonet. Well, i tried to implement the example provided in the project page. However, it wasn’t successful.

Server code:

public class KryoTest {

public KryoTest() throws IOException {
    Server server = new Server();
    server.start();
    server.bind(54555, 54777);
    server.addListener(new Listener() {

        public void received(Connection connection, Object object) {
            if (object instanceof SomeRequest) {
                SomeRequest request = (SomeRequest) object;
                System.out.println(request.text);

                SomeResponse response = new SomeResponse();
                response.text = "Thanks!";
                connection.sendTCP(response);
            }
        }
    });
    Kryo kryo = server.getKryo();
    kryo.register(SomeRequest.class);
    kryo.register(SomeResponse.class);
}

public static void main(String[] args) throws IOException {
    new KryoTest();
}}

Client Code:

    public class Kryoclient {

    public Kryoclient() throws IOException {
    Client client = new Client();
client.start();
client.connect(5000,"192.168.1.4", 54555, 54777);

SomeRequest request = new SomeRequest();
request.text = "Here is the request!";
client.sendTCP(request);

 Kryo kryo = client.getKryo();
kryo.register(SomeRequest.class);
kryo.register(SomeResponse.class);

}
    public static void main(String[] args) throws IOException {
        new Kryoclient();
    }
}

Exception:

run:
00:00  INFO: Connecting: /192.168.1.4:54555/54777
00:00  INFO: [kryonet] Connection 1 connected: /192.168.1.4
Exception in thread "main" java.lang.IllegalArgumentException: Class is not registered: client.SomeRequest
    at com.esotericsoftware.kryo.Kryo.getRegisteredClass(Kryo.java:319)
    at com.esotericsoftware.kryo.Kryo.writeClass(Kryo.java:374)
    at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:484)
    at com.esotericsoftware.kryonet.TcpConnection.send(TcpConnection.java:196)
    at com.esotericsoftware.kryonet.Connection.sendTCP(Connection.java:68)
    at client.Kryoclient.<init>(Kryoclient.java:24)
    at client.Kryoclient.main(Kryoclient.java:30)

What is wrong with this code?

Answer 1

I’ve never heard of Kryonet before now, but I’d assume you’ll need to move your kryo.register(...) lines to before the client or the server first tries to connect or accept a connection, respectively.