@joshadams That is the framework I talked to you about. it uses RX for concurrency and guice for IOC/DI:
http://www.ratpack.io/I think it is pretty well organized, and lots of supporters -nothing like rails obviously-.
The play framework (JAVA) is one you might want to look at as well (the current generation is much better that the first round), they will be presenting in OSCONF. They are now also talking about embedding an IOC (guice) in the next generation -they really need one-.
The one we use daily is dropwizard... mainly because of jax-rs... but obviously we use rails as it's front end ;); yet I see plenty of folks use ember/angular as a front end to DW.
Cheers!
-Simo