Spring 3.1's MVC Web Application Initializer

WebAppInitializer.java

public class WebAppIntializer implements WebApplicationInitializer {
 
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        //parent
        AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
        rootContext.register(AppConfig.class);
 
        servletContext.addListener(new ContextLoaderListener(rootContext));
//        new ContextLoader(rootContext).initWebApplicationContext(servletContext);
 
        //child
        AnnotationConfigWebApplicationContext dispatcherServletContext = new AnnotationConfigWebApplicationContext();
        dispatcherServletContext.register(WebConfig.class);
 
        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("spring", new DispatcherServlet(dispatcherServletContext));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");
    }
}