Dagger: activityInjector() returned null

[vthakur1993]

I have been trying to solve this and have looked through lot of tutorials.Could you please help in solving the below problem

I am getting NPE on line "AndroidInjection.inject(this);"

Caused by: java.lang.NullPointerException: com.example.vipulthakur.testprojectmvvm.TestProjectMVVMApplication.activityInjector() returned null
at dagger.internal.Preconditions.checkNotNull(Preconditions.java:79) at dagger.android.AndroidInjection.inject(AndroidInjection.java:56) at com.example.vipulthakur.testprojectmvvm.MainActivity.onCreate(MainActivity.java:50) at android.app.Activity.performCreate(Activity.java:6662) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)  at android.app.ActivityThread.-wrap12(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) 

public class TestProjectMVVMApplication extends Application implements HasActivityInjector {

    @Inject
    DispatchingAndroidInjector<Activity> dispatchingActivityInjector;

    @Override
    public void onCreate() {
        super.onCreate();
        DaggerApplicationComponent
                .builder()
                .application(this)
                .build()
                .inject(this);
    }

    @Override
    public AndroidInjector<Activity> activityInjector() {
        return dispatchingActivityInjector;
    }
}

Application Component:

@Component(modules = {AndroidInjectionModule.class, ApplicationModule.class, MapActivityBuilder.class})
public interface ApplicationComponent {
   @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);
        ApplicationComponent build();
    }
 void inject(Application app);
}

ActivityBuilder Class:

@Module(subcomponents = ActivityComponent.class)
abstract class MapActivityBuilder {

    @Binds
    @IntoMap
    @ActivityKey(MainActivity.class)
    abstract AndroidInjector.Factory<? extends Activity> bindActivity(ActivityComponent.Builder builder);
}

[ronshapiro]

This appears to be a question - please use StackOverflow with the dagger-2 tag instead, as that is a better forum for questions.

[tbroyer]

Possibly related to #748 (though in this case, the application would be non-null, but onCreate likely wouldn't have been called on it)

[djordjeh]

In application component class just instead injecting Application class change to inject your application class in this particular case TestProjectMVVMApplication and it should work.

[abhiroopnray]

Hope you had added application class name in the Android Manifest file. Without it, the app will work but the dagger component will be null.