Router.attach "/" and Router.attach "" -- what's the difference?

[Hendy Irawan]

In a Restlet application, if I do this:

    @Override
    public Restlet createRoot() {
        log.info("createRoot() called");
        Router router = new Router(getContext());
        // Front page "index"
        router.attach("", FrontResource.class);
        // Rule database group
        router.attach("group", GroupResource.class);
        return router;
    }

The application works fine, but only if I initially access i.e.
http://localhost:8080/

Accessing other URLs, like http://localhost:8080/something.xml doesn't give
me 404, but instead gives the front resource.

group resource is accessible through http://localhost:8080/group and
http://localhost:8080/group.xml

If I change the implementation to this:

    @Override
    public Restlet createRoot() {
        log.info("createRoot() called");
        Router router = new Router(getContext());
        // Front page "index"
        router.attach("/", FrontResource.class);
        // Rule database group
        router.attach("/group", GroupResource.class);
        return router;
    }

The application doesn't work, accessing i.e. http://localhost:8080/ gives
me:

The server has not found anything matching the request URI

You can get technical details
here<http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5>
.
Please continue your visit at our home page <http://localhost:8080/>.
neither does any other URLs.

Please help. Thank you.

I'm using restlet 1.1-m4.

-- 
Best regards,
Hendy Irawan