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Re:Ask HN: Modern stacks and frameworks for fast web app dev... by lanna on Sunday May 05, 2013 @10:58AM (#5658488)
For Scala:

. Scalatra

. Play + Akka

Re:Ask HN: Modern stacks and frameworks for fast web app dev... by j-m-o on Sunday May 05, 2013 @11:28AM (#5658583)
The Play framework works quite well in Java as well. Although some knowledge of Scala is useful for the template engine, as well as some spots where the Java API abstraction leaks a bit.