[ksp] InjectProcessingStep was unable to process a class which extends Binder Stub because 'error.NonExistentClass' could not be resolved.

[Goooler]

There is a class which extends Binder Stub like

class RemoteUnfoldTransitionReceiver
@Inject
constructor(
    useReceivingFilter: Boolean,
    private val executor: Executor
) : UnfoldTransitionProgressProvider, IUnfoldTransitionListener.Stub() {
}

(IUnfoldTransitionListener.Stub is generated from IUnfoldTransitionListener.aidl), provide RemoteUnfoldTransitionReceiver as

@Module
@DisableInstallInCheck
class UnfoldRemoteModule {
    @Provides
    @Singleton
    fun provideTransitionProvider(
        config: UnfoldTransitionConfig,
        traceListener: ATraceLoggerTransitionProgressListener,
        remoteReceiverProvider: Provider<RemoteUnfoldTransitionReceiver>,
    ): Optional<RemoteUnfoldTransitionReceiver> {
        if (!config.isEnabled) {
            return Optional.empty()
        }
        val remoteReceiver = remoteReceiverProvider.get()
        remoteReceiver.addCallback(traceListener)
        return Optional.of(remoteReceiver)
    }
}

This could be compiled by Hilt Kapt compiler but Hilt KSP compiler, with the error below:

e: [ksp] InjectProcessingStep was unable to process 'RemoteUnfoldTransitionReceiver(boolean,java.util.concurrent.Executor)' because 'error.NonExistentClass' could not be resolved.

Dependency trace:
    => element (CLASS): com.android.systemui.unfold.progress.RemoteUnfoldTransitionReceiver
    => type (ERROR superclass): error.NonExistentClass

If type 'error.NonExistentClass' is a generated type, check above for compilation errors that may have prevented the type from being generated. Otherwise, ensure that type 'error.NonExistentClass' is on your classpath.
e: [ksp] InjectProcessingStep was unable to process 'UnfoldTransitionProgressForwarder()' because 'error.NonExistentClass' could not be resolved.

Dependency trace:
    => element (CLASS): com.android.systemui.unfold.progress.UnfoldTransitionProgressForwarder
    => type (ERROR superclass): error.NonExistentClass

If type 'error.NonExistentClass' is a generated type, check above for compilation errors that may have prevented the type from being generated. Otherwise, ensure that type 'error.NonExistentClass' is on your classpath.
e: [ksp] ComponentProcessingStep was unable to process 'com.android.systemui.unfold.RemoteUnfoldSharedComponent' because 'error.NonExistentClass' could not be resolved.

Dependency trace:
    => element (CLASS): com.android.systemui.unfold.progress.RemoteUnfoldTransitionReceiver
    => type (ERROR superclass): error.NonExistentClass

If type 'error.NonExistentClass' is a generated type, check above for compilation errors that may have prevented the type from being generated. Otherwise, ensure that type 'error.NonExistentClass' is on your classpath.
e: Error occurred in KSP, check log for detail

You can repro this issue at LawnchairLauncher/lawnchair#3761 with following steps:

1. git clone --recursive https://github.com/LawnchairLauncher/lawnchair.git
2. git checkout repro-hilt-ksp-compiler-issue
3. ./gradlew assembleLawnWithQuickstepDebug

[Goooler]

Links #4049.

[Goooler]

Workaround:

// Workaround for https://github.com/google/dagger/issues/4158
androidComponents {
    onVariants(selector().all(), { variant ->
        afterEvaluate {
            def capName = variant.name.capitalize()
            tasks.getByName("ksp${capName}Kotlin") {
                setSource(tasks.getByName("compile${capName}Aidl").outputs)
            }
        }
    })
}

[VincentMasselis]

I'm facing the exact same issue with SQLDelight. In my case, I was able to make it work by updating build.gradle.kts like this:

// This is written for Gradle KTS 
androidComponents {
    onVariants(selector().all()) { variant ->
        afterEvaluate {
            val capName = variant.name.capitalize()
            tasks.getByName<KotlinCompile>("ksp${capName}Kotlin") {
                setSource(tasks.getByName("generate${capName}DatabaseInterface").outputs)
            }
        }
    }
}

[danysantiago]

Filled https://issuetracker.google.com/313669430 for the AGP team as they own the AIDL stub generation.

[wbervoets]

https://issuetracker.google.com/313669430 has been fixed, but this issue still gives me the same error when using ksp 1.9.23-1.0.20. Are there any other things I could try?

[aftabahmadTW]

@danysantiago any chance you could follow up with the AGP team about this as it still exists for generated code such as for sqldelight.

[Chang-Eric]

@aftabahmadTW This issue was just for AIDL generated code. Even though the error looks similar, I think it could need to be fixed for each code generator depending on where the generated code is outputted. So you should file a separate issue for SQLDelight.

[aftabahmadTW]

@Chang-Eric Thanks, I'll create a small reproducer and file a new issue