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nothing that awesome to make me switch from Grails.

Is it easy to do non-blocking code in Grails? I have played with Groovy lately and it is definitely a productive language.

Is not as easy as using the Scala Future API or Akka Actors.

In Groovy you have to use Gpars (http://gpars.codehaus.org/), a third party library which is not as simple as Scala Futures, IMHO

Can you please elaborate?