Spring MVC - DispatcherServlet Examples

    @Override
    public void onStartup (ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext ctx =
                            new AnnotationConfigWebApplicationContext();
        //register our config class
        ctx.register(MyWebConfig.class);

        ctx.setServletContext(servletContext);

        //using servlet 3 api to dynamically create
        //spring dispatcher servlet
        ServletRegistration.Dynamic servlet =
                            servletContext.addServlet("springDispatcherServlet",
                                                      new DispatcherServlet(ctx));

        servlet.setLoadOnStartup(1);
        servlet.addMapping("/");
    }

    @Override
    protected FrameworkServlet createDispatcherServlet (WebApplicationContext wac) {
        DispatcherServlet ds = new DispatcherServlet(wac);
        //setting this flag to true will throw NoHandlerFoundException instead of 404 page
        ds.setThrowExceptionIfNoHandlerFound(true);
        return ds;
    }

    @Override
    protected FrameworkServlet createDispatcherServlet (WebApplicationContext wac) {
        DispatcherServlet ds = new DispatcherServlet(wac);
        ds.setDetectAllHandlerExceptionResolvers(false);
        return ds;
    }

public class MyWebInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup (ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext ctx =
                  new AnnotationConfigWebApplicationContext();
        ctx.register(AppConfig.class);
        ctx.setServletContext(servletContext);

        ServletRegistration.Dynamic servlet =
                  servletContext.addServlet("springDispatcherServlet",
                                            new DispatcherServlet(ctx));

        servlet.setLoadOnStartup(1);
        servlet.addMapping("/");
    }
}