creates the "inject" method automatically with AndroidInjector<Class>

AppComponent.java

// *** Must specify specific TYPE here. 'BaseApplication', not 'Application'. Since it generates an inject(BaseApplication app); method.
public interface AppComponent extends AndroidInjector<BaseApplication> { // no need for inject method. It's generated.

    LoginComponent.Builder newLoginComponentBuilder();

//    void inject(BaseApplication application);

    @Component.Builder
    interface Builder {

        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }
}