Hello, I'm having a base class like this: ```abstract class Scene : JavaScene() { // JavaScene is a ...

# compose

[Loney Chou]

Hello, I'm having a base class like this:

abstract class Scene : JavaScene() { // JavaScene is a Java class
    private var composition: Composition? = null

    fun setContent(content: @Composable () -> Unit) {
        composition = Composition(/* ... */).apply { setContent(content) }
    }
}

and a subclass like this:

class MyScene : Scene() {
    override fun init() { // From JavaScene
        setContent { /* ... */ }
    }
}

Nothing complains during the compile time, but at the runtime when init gets called, Scene.setContent throws an error: androidx.compose.runtime.internal.ComposableLambdaImpl cannot be cast to kotlin.jvm.functions.Function0. How to fix that?

[Oleksandr Balan]

Not sure why this happens, but did you try to not pass content lambda directly, but instead call it?

fun setContent(content: @Composable () -> Unit) {
    composition = Composition(/* ... */).apply { setContent { content() } }
}

[Loney Chou]

Same error :(

[Loney Chou]

Honestly is this a java interop issue? I added that the Scene is a derived class from a java class

[Loney Chou]

and that init comes from that java class

[Loney Chou]

'Cause I test this with pure kotlin, nothing happens.

[Oleksandr Balan]

Honestly is this a java interop issue?

Could be 🤷
Never has to work with Java & Compose 😕

[Loney Chou]

Maybe derived class from java has different behavior during the compile time, and compose don't get it.

[Loney Chou]

But abstract method @Composable abstract fun content() works properly.