Solved NoClassDefFoundError when trying to use Kryonet

I've tried implementing the Kryonet networking library to my project, however I always get NoClassDefFoundError when the class is loaded. I know why and when the error should be thrown, but I cannot seem to fix it.

I've tried adding the Kryonet jar as an external jar and a user library (not both at the same time, of course), and have modified the Order and Export in Eclipse to load Kryonet first.

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Perhaps I'm doing something wrong? I haven't been coding for a while so I'm a bit rusty. Here is the relevant code:

Code:java

public void onEnable() {
Thread serverThread = new IServer();
serverThread.start();
}

Code:java

import java.io.IOException;
 
import me.jhaz.bukkitbuddy.net.Network.Packet;
import me.jhaz.bukkitbuddy.server.net.packet.PacketHandler;
 
import org.bukkit.Bukkit;
 
import com.esotericsoftware.kryonet.Connection;
import com.esotericsoftware.kryonet.Listener;
import com.esotericsoftware.kryonet.Server;
 
public class IServer extends Thread {
 
@Override
public void run() {
try {
runServer();
} catch (IOException e) {
e.printStackTrace();
return;
}
}
 
Server server;
 
private void runServer() throws IOException {
server = new Server() {
protected Connection newConnection() {
return new MiddlemanConnection();
}
};
 
Network.register(server);
 
server.addListener(new Listener() {
public void connected(Connection c) {
Bukkit.getLogger().info("Middleman connected: " + c.getRemoteAddressTCP());
}
 
public void received(Connection c, Object object) {
if (object instanceof Packet) {
Packet packet = (Packet) object;
PacketHandler.handlePacket(c, packet);
return;
}
}
 
public void disconnected(Connection c) {
Bukkit.getLogger().info("Middleman disconnected");
}
});
 
server.bind(Network.port);
server.start();
 
Bukkit.getLogger().info("Waiting for middleman...");
}
 
static class MiddlemanConnection extends Connection {}
}

Thanks in advance.

Edit: Sorry, the formatting messed up when I edited my post earlier.

 

Assist Your IDE might know about the jar, but the server doesn't. You need to add the jar to the Class-Path in such a way that it can be found from the server root. For example:

• Class-Path has "../lib/kryonet-2.21-all.jar"
• <server root>/lib/ should have a the jar, named kryonet-2.21-all.jar

 

Assist First step is to check your jar contents to make sure that the required packages have been exported.

 

fireblast709
That must be it, I knew I forgot something!

AdamQpzm
I would have, but I'm not sure how. Usually I just open the jar with WinRAR, however I don't have it on this computer.