I’m encountering an issue while working with Classic Akka in Java. It seems that Akka is unable to use Java’s built-in type casting when creating actors and using .tell().

Below is a simplified version of my code:

Main Class:

import akka.actor.ActorSystem;
import akka.actor.ActorRef;
import akka.actor.Props;
import java.util.UUID;

public class Main {
    public static void main(String[] args){
        ActorSystem system = ActorSystem.create("system");
        ActorRef actorA = system.actorOf(Props.create(ActorA.class , 0), UUID.randomUUID().toString());
        actorA.tell(new ActorA.MessageA(7,3),ActorRef.noSender());
    }
}

Actor:

import akka.actor.UntypedAbstractActor;

public class ActorA extends UntypedAbstractActor {
    private long result;
    public ActorA(long StartValue) {
    }
    //on method: MessageA
    public static final class MessageA {
        public final double paramD;
        public final long paramL;
        public MessageA(double paramD, long paramL) {
            this.paramD = paramD;
            this.paramL = paramL;
        }
    }
    private void onMessageA(double paramD,long paramL) {
        System.out.println(paramD);
        System.out.println(paramL);
    }
    public void onReceive(Object message) {
        if (message instanceof MessageA MessageAMsg) {
            onMessageA(MessageAMsg.paramD, MessageAMsg.paramL);
        } else {
            unhandled(message);
        }
    }
}

However, when I run this code, I encounter the following error:

Exception in thread "main" java.lang.IllegalArgumentException: no matching constructor found on class output.ActorA for arguments [class java.lang.Integer]
...

It seems that Akka is expecting an Integer argument instead of a long when creating the ActorA instance. Same goes for Double and Integer. I’m confused because Java usually handles type casting implicitly. Is there a specific reason why Akka behaves this way, and how can I resolve this issue?

Any insights or suggestions would be greatly appreciated. Thank you!