I\'ve gotten our stack converted to Rails 4 (yea!)
and I\'m looking to take advantage of the thread-safe code.
Puma works in getting up, stopping it appears
Trinidad is nice. A very powerful server for jRuby development:
http://blog.jruby.org/2012/04/two-apps-one-trinidad/
http://railscasts.com/episodes/377-trinidad?view=comments
Here are some good benchmarks (the Trini server beats puma):
http://carlhoerberg.github.io/blog/2012/03/31/jruby-application-server-benchmarks/
A nice Trinidad Server setup tutorial:
http://blog.jruby.org/2012/04/two-apps-one-trinidad/