JRuby 1.7.1 is our first update release since JRuby 1.7.0. The primary goal of 1.7 point releases is to fill out any missing compatibility issues with Ruby 1.9.3. The feedback we have gotten (along with patches) has ended up being a subtantial release.
Full article: http://jruby.org/2012/12/03/jruby-1-7-1.html
