Faild to load vaadinBootstrap.js with Spring + WebServlet 3.0

Question

I am working with Vaadin 7.7 and SpringFramework with Maven.

The code I made worked last time, but today it does not work. The error message is Failed to load bootstrap javascript : ./VAADIN/vaadinBootstrap.js?v=7.7.0.

I have searched the internet, and found this. Vaadin's vaadinBoootstrap.js

I says I need session-config in web.xml. However, I do not have web.xml since I am using servlet version 3.X. So I add this statement to my WebApplicationInitializer. My code is below.

public class FarmInitializer implements WebApplicationInitializer {
    static private Logger logger = LoggerFactory.getLogger(Logger.class);

    @Override
    public void onStartup(ServletContext arg0) throws ServletException {
        System.out.println("=== Starts ===");
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(ServletConfig.class);
        ctx.register(FileConfig.class);
        ctx.register(DBConfig.class);


        //Solution of vaadinBootstrap.js?
        Set<SessionTrackingMode> sessionConfigSet = new HashSet<>();
        sessionConfigSet.add(SessionTrackingMode.COOKIE);
        arg0.setSessionTrackingModes(sessionConfigSet);

        arg0.addListener(new ContextLoaderListener(ctx));
        registerServlet(arg0);
        System.out.println("=== Ends ===");
    }

    private void registerServlet(ServletContext ctx){
        Dynamic dispatcher = ctx.addServlet("vaadin", SpringVaadinServlet.class);
        dispatcher.addMapping("/");
        dispatcher.setLoadOnStartup(0);
        logger.info("=== DONE ===");
    }
}

But It does not work still. Is there any solution for this problem? My server is Tomcat 7.X. Thanks for your help!

Answer 1

have you tried to map your vaadin servlet as /* (instead of /) or to add a mapping for /VAADIN/*

dispatcher.addMapping("/*");