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Re:Twitter: From Ruby on Rails to the JVM [video] by jefft on Saturday July 30, 2011 @11:16AM (#2825926)
I recall reading an interview with Evan Weaver that the problem with moving to JRuby was in client libraries they were using, not JRuby itself.
Re:Twitter: From Ruby on Rails to the JVM [video] by kemiller on Saturday July 30, 2011 @11:34AM (#2825959)
That is indeed the issue if you want to convert an existing rails app to JRuby. But if you're just starting out, it's a different story: you'll end up much more JVM-focused since the best option is generally to use the java equivalent instead of a ruby gem, but there are options.

I've been using rails for almost 7 years now (holy crap) and run a medium-sized site on it. It works just fine, but if I were starting from scratch today, I would still use Rails, but I'd run it on JRuby.

Re:Twitter: From Ruby on Rails to the JVM [video] by larrywright on Saturday July 30, 2011 @03:02PM (#2826397)
Agreed. There are certainly some people who can't use the JVM for some reason (client libraries being a common one), but I think most people would be best served by using JRuby. There's a lot of innovation going on there, and platforms like Torquebox[1] have some compelling benefits.

1. http://torquebox.org/