It's very new – not sure if yu'll find much community/testimonials – but since it supports (among other languages) Ruby and JS, uses the Netty framework, and opens the world of other Java libraries to your project, it might offer you the shortest-path to watching a JVM run your ideas under load.
http://vertx.io
It's very new – not sure if yu'll find much community/testimonials – but since it supports (among other languages) Ruby and JS, uses the Netty framework, and opens the world of other Java libraries to your project, it might offer you the shortest-path to watching a JVM run your ideas under load.