Problem: GAE - Attaching sub applications does not work

[Sam]

I am trying to create an application on GAE using the Restlet-GAE M6 ..

I ran into a problem when trying to attach an sub Application to the root 
Application ..

here is what I am trying to do:
public class RootApplication extends Application {

    @Override
    public Restlet createInboundRoot() {
        Router router = new Router(getContext());

        router.attach("/a/", new SubApplication());
        return router;
    }
}

public class SubApplication extends Application {

    @Override
    public Restlet createInboundRoot() {
        Router router = new Router(getContext());

        router.attach("b/", HelloWorldHelloWorldResource.class);
        return router;
    }
}

public class HelloWorldResource extends ServerResource {

    @Get
    public String represenxst() {
        return "hello, world (from the cloud!)";
    }

}


I have tested this on the SE edition and it worked fine when I go to /a/b/ url 
it works as expected .. but on GAE it does not work

any suggestions on why this is happening?

Thanks in advance

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