Akka complains to a generic parameter

Question

I have a class hierarchy like this:

abstract class Class1[T <: Class2 : ClassTag] extends Actor {

  protected val val1 = context.actorOf(Props[T])   // ops!
  //..........
}

abstract class Class2[T <: Actor] extends Actor {
//................
}

However, it complains type arguments [T] do not conform to method apply's type parameter bounds [T <: akka.actor.Actor]

How do I fix that?

Akka actors are not typed. This [SO post](http://stackoverflow.com/questions/5547947/why-are-messages-to-akka-actors-untyped) explains why. You may want to use [TypedActors](http://doc.akka.io/docs/akka/2.2.1/scala/typed-actors.html) instead. — S.R.I, Sep 12 '13 at 04:39
Does `Class2` really need to have a generic type that is also an `Actor`? Is it going to use that type internally for something? — cmbaxter, Sep 12 '13 at 12:59

Jatin · Accepted Answer · 2013-09-12T06:27:41.273

2

The error is because you are not passing type parameter with Class2. Give the type parameter and it works:

abstract class Class1[T <: Class2[_] : ClassTag] extends Actor {
    protected val val1 = context.actorOf(Props[T])
}

edited Sep 12 '13 at 06:27

answered Sep 12 '13 at 05:44

Jatin

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@MariusKavansky Oops. Sorry I did not see the `Class2` declaration in your code. I have edited it. – Jatin Sep 12 '13 at 06:28

Akka complains to a generic parameter

1 Answers1