Kotlin reified generics issue

reified-issue.kt

open class A {

}

open class B {

}


class Factory<R>(val mapper: () -> R) {

}

inline fun <reified T> factory(): Factory<T> {
    return Factory(::createA)
}

inline fun <reified T: A> factoryWithConstrain(): Factory<T> {
    return Factory(::createA)
}

inline fun <reified T: A> createA(): T {
    return T::class.java.getDeclaredConstructor().newInstance()
}

inline fun <reified T: B> createB(): T {
    return T::class.java.getDeclaredConstructor().newInstance()
}

fun main() {
    val container: Factory<A> = factory()

    println("result: ${container.mapper()}") // class java.lang.Object cannot be cast to class A (java.lang.Object is in module java.base of loader 'bootstrap'; A is in unnamed module of loader 'app')
}