cannot be provided without an @Provides-annotated method, A binding with matching key exists in component

Question

I'm trying to add dagger2 in a seed project for learn pourposes (I'm not an expert), but i havving the same problem:

e: /Users/foca/projects/personalProjects/bar-droid-application/bar-droid/app/build/tmp/kapt3/stubs/debug/com/bar/bar_droid/di/AppComponent.java:8: error: [Dagger/MissingBinding] com.bar.bar_droid.domain.repository.RegisterRepository cannot be provided without an @Provides-annotated method. public abstract interface AppComponent extends dagger.android.AndroidInjector { ^ A binding with matching key exists in component: com.bar.bar_droid.ui.accessflow.di.AccessScreenProvider_ProvideRoleSelectorFragmentFactory.RoleSelectionFragmentSubcomponent com.bar.bar_droid.domain.repository.RegisterRepository is injected at com.bar.bar_droid.domain.interactor.userregistration.UserRegistrationUseCase(registerRepository, …) com.bar.bar_droid.domain.interactor.userregistration.UserRegistrationUseCase is injected at com.bar.bar_droid.ui.accessflow.roleselector_fragment.viewmodel.RoleSelectionViewModel(…, userRegistrationUseCase) com.bar.bar_droid.ui.accessflow.roleselector_fragment.viewmodel.RoleSelectionViewModel is injected at com.bar.bar_droid.ui.di.ViewModelModule.provideRoleSelectionViewModel(roleSelectionViewModel) java.util.Map,javax.inject.Provider> is injected at com.bar.bar_droid.utils.mvvm.ViewModelFactory(creators) com.bar.bar_droid.utils.mvvm.ViewModelFactory is injected at com.bar.bar_droid.ui.accessflow.loginselector_fragment.LoginFragment.viewModelFactory com.bar.bar_droid.ui.accessflow.loginselector_fragment.LoginFragment is injected at dagger.android.AndroidInjector.inject(T) [com.bar.bar_droid.di.AppComponent → com.bar.bar_droid.di.ActivityBuilderModule_BindAccessActivity.AccessActivitySubcomponent → com.bar.bar_droid.ui.accessflow.di.AccessScreenProvider_ProvideLoginSelectorFragmentFactory.LoginFragmentSubcomponent] It is also requested at: com.bar.bar_droid.domain.interactor.userregistration.UserRegistrationUseCase(registerRepository, …) The following other entry points also depend on it: dagger.android.AndroidInjector.inject(T) [com.bar.bar_droid.di.AppComponent → com.bar.bar_droid.di.ActivityBuilderModule_BindAccessActivity.AccessActivitySubcomponent → com.bar.bar_droid.ui.accessflow.di.AccessScreenProvider_ProvideMailPasswordFragmentFactory.MailPasswordSignUpFragmentSubcomponent] dagger.android.AndroidInjector.inject(T) [com.bar.bar_droid.di.AppComponent → com.bar.bar_droid.di.ActivityBuilderModule_BindMainActivity.MainActivitySubcomponent → com.bar.bar_droid.ui.mainflow.di.MainFlowProvider_ProvideMenuFragmentFactory.MenuFragmentSubcomponent]

Here my Code:

Application:

class MainApplication : Application(), HasAndroidInjector {

    @Inject lateinit var androidInjector : DispatchingAndroidInjector<Any>

    override fun onCreate() {
        super.onCreate()

        // Starts Dagger
        DaggerAppComponent.builder()
            .application(this)
            .build()
            .inject(this)
    }

    override fun androidInjector(): AndroidInjector<Any> = androidInjector
}

Dagger Component:

@Singleton
@Component(
    modules = [AndroidSupportInjectionModule::class,
        ApplicationModule::class,
        RoomDatabaseModule::class,
        FirebaseModule::class,
        GoogleModule::class,
        ActivityBuilderModule::class]
)
interface AppComponent : AndroidInjector<MainApplication> {

    @Component.Builder
    interface Builder {
        @BindsInstance
        fun application(app: Application): Builder
        fun build(): AppComponent
    }
}

ActivityBuilderModule:

@Module
abstract class ActivityBuilderModule {

    @PerActivity
    @ContributesAndroidInjector(modules = [AccessScreenProvider::class, AccessScreenDependencyProvider::class])
    abstract fun bindAccessActivity(): AccessActivity

    @PerActivity
    @ContributesAndroidInjector(modules = [MainFlowProvider::class])
    abstract fun bindMainActivity(): MainActivity
}

Fragments for AccessActivity:

@Module
abstract class AccessScreenProvider {

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, LoginSelectorProvider::class])
    abstract fun provideLoginSelectorFragmentFactory(): LoginFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class])
    abstract fun provideMailPasswordFragmentFactory(): MailPasswordSignUpFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, RoleSelectionProvider::class])
    abstract fun provideRoleSelectorFragmentFactory(): RoleSelectionFragment
}

ViewModelModule:

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
internal annotation class ViewModelKey(val value: KClass<out ViewModel>)

@Module
abstract class ViewModelModule {

    @Binds
    abstract fun provideViewModelFactory(factory: ViewModelFactory): ViewModelProvider.Factory

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(LoginViewModel::class)
    abstract fun provideLoginViewModel(loginViewModel: LoginViewModel): ViewModel

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(MailPasswordSignUpViewModel::class)
    abstract fun provideMailPasswordSighUpViewModel(mailPasswordSignUpViewModel: MailPasswordSignUpViewModel): ViewModel

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(RoleSelectionViewModel::class)
    abstract fun provideRoleSelectionViewModel(roleSelectionViewModel: RoleSelectionViewModel): ViewModel
}

And finally for RoleSelectionProvide:

@Module
class RoleSelectionProvider {

    @Provides
    @PerFragment
    fun provideRealAuthDataSource(fireBaseAuth: FirebaseAuth): UserAuthDataSource = RealUserAuthDataSource(fireBaseAuth)

    @Provides
    @PerFragment
    fun provideRegisterRepository(realUserAuthDataSource: RealUserAuthDataSource, userProfileDao: UserProfileDao): RegisterRepository {
        return RegisterRepositoryImpl(realUserAuthDataSource, userProfileDao)
    }
}

The only place that I'm injecting RegisterRepositoryImpl is on UserRegistrationUseCase, I don't have any idea about what I'm doing wrong.

Answer 1

It is strange that you are using it in two places: ViewModelModule. It is most probably the problem and the duplication of keys error. "A binding with matching key exists in component:"

Also in provideMailPasswordFragmentFactory you are passing only ViewModelModule, but in provideRoleSelectorFragmentFactory you are passing both ViewModelModule and also RoleSelectionProvider. In the first case, you are missing the dependencies provided by RoleSelectionProvider which provides the Repository.

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class])
    abstract fun provideMailPasswordFragmentFactory(): MailPasswordSignUpFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, RoleSelectionProvider::class])
    abstract fun provideRoleSelectorFragmentFactory(): RoleSelectionFragment