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Re:Vert.x (JVM async) vs Node.js Http benchmarks results by orefalo on Wednesday May 09, 2012 @06:00PM (#3950696)
You already have Scala+Async IO+Netty, it's called play framework 2.0

http://www.playframework.org/

Re:Vert.x (JVM async) vs Node.js Http benchmarks results by eropple on Wednesday May 09, 2012 @08:30PM (#3951240)
I've used it. Not a fan of many (most) of their design decisions, though it's better than the current alternatives.