Using Scala to Override a Java method that uses "? extends" - scala

Question

So I have a Java method:
public abstract List<Class<? extends MyClass>> getListOfClasses();
and I need to override it in Scala. Here is how I am currently doing it:
override def getListOfClasses: java.util.List[Class[_ <: MyClass[_]]] = { null }
However, this does not compile, and I get the error: method getListOfClasses has incompatible type
What am I doing wrong?
EDIT:
MyClass is defined in Java like this:
abstract class MyClass[T] extends MyOtherClass[T] {...}
FINAL EDIT:
As suggested by #AlexeyRomanov below, changing my Java method return type fixed the problem:
public abstract List<Class<? extends MyClass<?>>> getListOfClasses();

Answer 1

It's ugly but asInstanceOf works.
This ugliness comes from Java's inability to express covariance and contra-variance.
Interface:
import java.util.List;
public abstract class Game2J {
public interface MyClass {}
public abstract List<Class<? extends MyClass>> getListOfClasses();
}
Scala code:
import java.util
import Game2J.MyClass
import scala.collection.JavaConverters._
class Game2S extends Game2J {
class MyClass1 extends MyClass
class MyClass2 extends MyClass
override def getListOfClasses: util.List[Class[_ <: MyClass]] =
List(classOf[MyClass1], classOf[MyClass2]).asJava.asInstanceOf[util.List[Class[_ <: MyClass]]]
}
Working example:
public class Game2 {
public static void main(String[] args) {
new Game2S().getListOfClasses().stream().forEach((cl) -> System.out.println(cl.getSimpleName()));
}
}