Check out Play - I'm not a Java dev, but it should be fairly popular: http://www.playframework.com/
Generally speaking, the number of followers/contributors at Github is a pretty good sign of the overall activity of certain framework. Play has way higher numbers - you can see that here:
https://github.com/playframework/playframework https://github.com/apache/wicket
Check out Play - I'm not a Java dev, but it should be fairly popular: http://www.playframework.com/