App.java

public class App extends Application {

    private MortarScope mortarScope;

    private Component component;

    @Override
    public Object getSystemService(String name) {
        return mortarScope.hasService(name) ? mortarScope.getService(name) : super.getSystemService(name);
    }

    @Override
    public void onCreate() {
        super.onCreate();

        component = Dagger_App_Component.create();
        component.inject(this);

        mortarScope = MortarScope.buildRootScope()
                .withService(DaggerService.SERVICE_NAME, component)
                .build();
    }

    @dagger.Component
    @Singleton
    public static interface Component {

        RestClient restClient();

        SessionManager sessionManager();

        void inject(App app);
    }
}