How much compatible Kotlin generics are with Java ...

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[aoriani]

How much compatible Kotlin generics are with Java ?

sealed class NetworkResource<out ResponseType, out ErrorType> {
    class Loading<out ResponseType, out ErrorType> : NetworkResource<ResponseType, ErrorType>()
    data class Success<out ResponseType, out ErrorType>(val response: ResponseType) : NetworkResource<ResponseType, ErrorType>()
    data class Error<out ResponseType, out ErrorType>(val error: ErrorType) : NetworkResource<ResponseType, ErrorType>()
}

class NetworkObserver<ResponseType, ErrorType> : Observer<NetworkResource<ResponseType, ErrorType>> {}

When I use it from Java I'm getting incompatible types: <anonymous NetworkObserver<Object,String>> cannot be converted to Observer<NetworkResource<Object,String>>. However if I am remove out from NetworkResource it works for Java, but it messes type inference in Kotlin.

[aoriani]

It looks like some @JvmSuppressWildcards and looking at the bytecode do the job. I wonder if I am doing the right thing.