Getting this error when creating a custom `DataBin...

# kapt

[okaymak]

Getting this error when creating a custom DataBindingComponent inside a library module which is being used from an app module (in an android project):

e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
    class <redacted>.CustomComponent, unresolved supertypes: android.databinding.DataBindingComponent

Is this a bug in kapt?

[okaymak]

Tested with Kotlin 1.2.50 and 1.2.51

[gildor]

I don't think that this is a bug of kapt, more likely some problem with your dependencies or build config.
Are you sure that your module has runtime dependency of databindings?

[okaymak]

Databinding has been setup correctly in both modules using:
build.gradle:

apply plugin: 'kotlin-kapt'

...

dataBinding {
   enabled = true
}

This is created inside the library module:

class LifeCycleBindings(private val lifecycle: LifeCycle): LifecycleObserver {
    val disposables = CompositeDisposable()

    init {
        lifecycle.addObserver(this)
    }

    @BindingAdapter("test")
    fun TextView.test(test: String) {
	// just for demoing
        disposables.add(....)
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    fun dispose() {
        disposables.dispose()
    }
}

Building the project generates the following in both modules (by kapt?):

package android.databinding;

public interface DataBindingComponent {
    LifeCycleBindings getLifeCycleBindings();
}

Creating the following inside the library module (and using it in the app module), gives the aforementioned error:

class LifecycleBindingComponent(private val lifecycle: Lifecycle) : DataBindingComponent {
    override fun getLifeCycleBindings(): LifeCycleBindings {
        return LifeCycleBindings(lifecycle)
    }
}

But creating this file inside the app module (and using it in the app module) works without any problems.

I want to provide a ready made LifecycleBindingComponent for the consumers of this library, without having to force the consumer to create a class.

[okaymak]

@yan ^^ I can create a sample project if it helps.

[yan]

@okaymak It would be very appreciated.