if you have a static java method like: ```public s...

# getting-started

[zsperske]

if you have a static java method like:

public static <T> MyFactory<T> of(Class<T> baseType) { ... }

and you wanted to write a kotlin extension method like:

fun <T> MyFactory<T>.withSubTypes(types: List<Class<T>) {
   var factory = this
   types.forEach { factory = factory.withSubType(it) }
   return factory
}

How do you properly type the static method? If you write something like:

val factory = MyFactory.of(MyClass::class.java)
              .withSubTypes(listOf(...))

You'll get a syntax error on your list: Type mismatch. Required: Nothing Found: MyClass . Adding explicit type arguments doesn't help.

[Vampire]

Maybe it should be fun <T> MyFactory<T>.withSubTypes(types: List<Class<T>) {?

[zsperske]

Ah my mistake, my actual code does have that

[zsperske]

I believe I solved it, I needed my

[zsperske]

types: List<Class<T> to be types: List<Class<out T>