VAADIN 8 - Integrating @SpringUI without applicationContext.xml and Context

Vaadin 6 / 7 / 8
1

I’ve moved to xml config to JavaConfig. Now my vaadin UI is not working. Is it possible to configure vaadin without applicationcontext.xml?
Here is my configuration code -

public class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

  // Load database and spring security configuration
  @Override
  public void onStartup(ServletContext servletContext) throws ServletException {
    // TODO Auto-generated method stub
    super.onStartup(servletContext);
  }

  @Override
  protected Class<?>[] getRootConfigClasses() {
    return new Class[] {WebSecurityConfig.class, HibernateConfiguration.class};
  }

  // Load spring web configuration
  @Override
  protected Class<?>[] getServletConfigClasses() {
    return new Class[] {WebMvcConfig.class};
  }

  @Override
  protected String[] getServletMappings() {
    return new String[] {"/"};
  }

  @Override
  protected Filter[] getServletFilters() {
    CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
    characterEncodingFilter.setEncoding("UTF-8");
    return new Filter[] {characterEncodingFilter, new DelegatingFilterProxy("springSecurityFilterChain")};
  }

  @Override
  protected void registerContextLoaderListener(ServletContext arg0) {
    arg0.setInitParameter("webAppRootKey", "shopbeat.root");
    arg0.addListener(WebAppRootListener.class);
    arg0.addListener(RequestContextListener.class);
    super.registerContextLoaderListener(arg0);
  }

}

Below is my vaadin starter servlet -

@Push(PushMode.MANUAL)
@JavaScript({"https://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js", "vaadin://../assets/js/jquery.mp3.js", "vaadin://../assets/js/admin.js"})
@StyleSheet({"vaadin://../assets/css/player.css", "vaadin://../assets/css/custom.css"})
@Theme("skyadmin")
@PreserveOnRefresh
@SpringUI
public class SkyAdminApplication extends UI implements Broadcaster.BroadcastListener {

  private static final long serialVersionUID = -8851261841287750333L;
  public static final long TIME_EDGE = 259200L;
  // The main application window. All components are embedded in this object.
  private SkyAdminApplication instance;
  private static Logger log = Logger.getLogger(SkyAdminApplication.class);
  private boolean stop = false;
  // The context - store all data related to logged in user here
  private Context context = null;

  @EnableVaadin
  @Configuration
  public static class MyConfiguration {
  }

  static {
    Thread.setDefaultUncaughtExceptionHandler(new SkyAdminUncaughtExceptionHandler());
  }

  @Override
  protected void init(VaadinRequest request) {
    setWidthUndefined();
    UI.getCurrent().getPage().setTitle("Admin");
    setResponsive(true);
    // Close the application if the main window is closed.
    context = new Context();
    UI.getCurrent().addWindow(new LoginWindow(this));
    instance = this;
    Broadcaster.register(this);
  }

  // @return the current application instance
  public SkyAdminApplication getInstance() {
    return instance;
  }

  public Context getSkyAdminContext() {
    return context;
  }

  @WebServlet(urlPatterns = {"/app", "/app/*", "/VAADIN/*"}, name = "SkyAdminApplicationServlet", asyncSupported = true,
      initParams = {@WebInitParam(name = "org.atmosphere.useBlocking", value = "true")})
  @VaadinServletConfiguration(ui = SkyAdminApplication.class, productionMode = true)
  public static class MyUIServlet extends SpringVaadinServlet {
    private static final long serialVersionUID = 6823788931438099843L;

  }

  @Override
  public void detach() {
    Broadcaster.unregister(this);
    super.detach();
  }

  @Override
  public void receiveBroadcast(String message) {
    access(() -> Notification.show(message, Type.ERROR_MESSAGE));
  }
}

I’ve created Bean of MyConfiguration class-

@Configuration
@EnableAspectJAutoProxy
@EnableScheduling
@PropertySource("classpath:shopbeat.properties")
@ComponentScans(value = {@ComponentScan("com.skynetwork.entity"), @ComponentScan("com.skyadmin.web.config"), @ComponentScan("com.skyadmin.web.listeners"),
    @ComponentScan("com.skyadmin.web.servlets"), @ComponentScan("com.skyadmin.web.controller"), @ComponentScan("com.skyadmin.web.application"),
    @ComponentScan("com.skyadmin.web.ws"), @ComponentScan("con.skyadmin.web.skynetwork")})
public class WebMvcConfig extends WebMvcConfigurationSupport {
  @Bean
  public MyConfiguration getMyConfiguration() {
    return new MyConfiguration();
  }
}

Please help how can i fix the issue?