Ask HN: JVM templating engines? Looking for JSP alternatives

For the first time, I'm building a JVM-based web app. I'm looking for a good replacement for JSPs. I've used Rails and Django extensively and like both their templating engines quite a bit - probably because of this experience jsp makes me want to gag a bit.

I've look briefly at Velocity but the perlish '$' syntax puts me off - though I could probably get over that.

Notably it only has to play friendly with java - Groovy, Clojure, Scala, are all viable options. I'm also considering using JRuby and just sticking with the erb I know.

Thanks.