I would say go the HTML5 direction. It's probably a bit more stable than Java. Also, you can do a detection of whether or not the browser supports HTML5 technol

I would say go the HTML5 direction. It's probably a bit more stable than Java. Also, you can do a detection of whether or not the browser supports HTML5 technologies and give them the Java port if it does not. That should fix your issue. Add in new technology, but have a fallback if it support for it does not exist. That's just in theory though, i'm not sure how java works in Web or how you have to import it. I've never really worked with Java in terms of websites / web applications.