Firebase breaks Dagger

We recently added a class that extends FirebaseMessagingService to our code base. We use Dagger2 for dependency injection and noticed that our app started to have compilations errors. If we instead just extend Service everything works fine.

When putting verbose stacktrace on we get following stacktrace

Caused by: java.lang.IllegalArgumentException
    at com.google.common.base.Preconditions.checkArgument(Preconditions.java:108)
    at dagger.internal.codegen.writer.ClassName.peerNamed(ClassName.java:130)
    at dagger.internal.codegen.SourceFiles.membersInjectorNameForMembersInjectionBinding(SourceFiles.java:266)
    at dagger.internal.codegen.InjectBindingRegistry.registerBinding(InjectBindingRegistry.java:194)
    at dagger.internal.codegen.InjectBindingRegistry.getOrFindMembersInjectionBinding(InjectBindingRegistry.java:256)
    at dagger.internal.codegen.BindingGraph$Factory$RequestResolver.rollUpMembersInjectionBindings(BindingGraph.java:313)
    at dagger.internal.codegen.BindingGraph$Factory$RequestResolver.rollUpMembersInjectionBindings(BindingGraph.java:317)
    at dagger.internal.codegen.BindingGraph$Factory$RequestResolver.lookUpBindings(BindingGraph.java:305)
    at dagger.internal.codegen.BindingGraph$Factory$RequestResolver.resolve(BindingGraph.java:407)
    at dagger.internal.codegen.BindingGraph$Factory$RequestResolver.resolve(BindingGraph.java:410)
    at dagger.internal.codegen.BindingGraph$Factory.create(BindingGraph.java:168)
    at dagger.internal.codegen.BindingGraph$Factory.create(BindingGraph.java:105)

The key part is:

at com.google.common.base.Preconditions.checkArgument(Preconditions.java:108)
    at dagger.internal.codegen.writer.ClassName.peerNamed(ClassName.java:130)

Looking at source we see:

public ClassName peerNamed(String peerClassName) {
  checkNotNull(peerClassName);
  checkArgument(SourceVersion.isIdentifier(peerClassName));
  checkArgument(Ascii.isUpperCase(peerClassName.charAt(0)));
  return new ClassName(packageName(), enclosingSimpleNames(), peerClassName);
}

The line in question is: checkArgument(Ascii.isUpperCase(peerClassName.charAt(0))); the issue is due to FirebaseMessagingService extending com.google.firebase.iid.zzb which is in fact a class starting with a lower case letter. Not sure how I should proceed. Is this validation necessary?

[artem-zinnatullin]

JFYI: for now you can solve this by indirect class where you can inject dependencies required for service that extends FirebaseInstanceIdService.

Something like this:

class MyFirebaseInstanceIdService extends FirebaseInstanceIdService {

  class DiContainer {
    // Container for dependencies required for MyFirebaseInstanceIdService.

    @Inject Dep1 dep1;
    @Inject Dep2 dep2;
  }

  public void onCreate() {
    DiContainer diContainer = new DiContainer();
    MyApp.get(this).objectGraph().inject(diContainer);

    // Grab dependencies from diContainer.
  }
}

[digitalbuddha]

Also we were on Dagger 2.02 (shamefully)