Compiler errors on java 11

On Android Studio 4.2, which comes bundled with java 11, the project I’m working on doesn’t build anymore.

C:\...\app\build\tmp\kapt3\stubs\...\MainApplication.java:60: error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public class MainApplication extends com...BaseApplication implements dagger.android.HasAndroidInjector {
       ^C:\...\app\src\main\java\com\...\dependency_injection\ApplicationModule.java:26: error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public class ApplicationModule {
       ^C:\Users\...\app\src\main\java\com\...\dependency_injection\AppComponent.java:162: error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this interface because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public interface AppComponent {
       ^
> Task :app:kaptDebugKotlin FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
   > java.lang.reflect.InvocationTargetException (no error message)

The same project builds successfully with java 8.

Are there projects where dagger 2 works with java 11 already? If so, how can I debug and see why build fails on this project?

[drewhannay]

I simplified the repro project that was posted earlier in the thread: https://github.com/drewhannay/data-binding-dagger-jdk11-crash

I stripped out kapt and Kotlin entirely. I also removed dagger-android as it was not relevant.

It seems the minimum necessary to reproduce this bug is to use a data binding @BindingAdapter AND to run the dagger-compiler annotation processor. If I remove dagger from the project entirely, the crash does not reproduce. Likewise, if I remove the data binding @BindingAdapter, the crash does not reproduce. So there is some combination of the two that is producing this compiler crash.

Since the upcoming AGP 7 release will require JDK 11, this seems pretty urgent to address.

[bcorso]

Sorry for the delay, I was able to reproduce this but I still haven’t had time to debug yet – I’ll try to look into it this week.

However, from the new error message you posted in https://github.com/google/dagger/issues/2144#issuecomment-712436284, I don’t think that error is related to the SuperficialValidation. It seems to be something up with kapt.

For now, one workaround you can try is to create a concrete type of DataBindingComponent, e.g.

class MyDataBindingComponent implements DataBindingComponent {
  private final RandomBindingAdapter imagesBindingAdapter;

  @Inject
  MyDataBindingComponent(Context context) {
    this.imagesBindingAdapter = new RandomBindingAdapter(context);
  }

  @Override
  public RandomBindingAdapter getRandomBindingAdapter() {
    return imagesBindingAdapter;
  }
}

Then you can have users inject MyDataBindingComponent.