If a page is requested with invalid characters within a URL, the user will receive Error 500. An example would be something like : http://localhost:8080/magnoliaPublic/trav[el.html . Where the "[" is the invalid character.

The error seems to be coming from the ContentType filter. Ideally, some sort of error handling would be placed within here so that Error 500 would not show. Just as examples, perhaps an Error 400 or 404 would be shown instead.