I'm not sure about lingua franca but it does kinda want to be the language of the web. You're already running it on the browser. So there is a synergy in having

I'm not sure about lingua franca but it does kinda want to be the language of the web. You're already running it on the browser. So there is a synergy in having it on the server also. GWT lets you do write sides in Java, but there really isn't any reason not to do both sides in Javascript.