JRuby has made great progress over the past year, now supporting most of Ruby's libraries and capabilities as well as running mainstream apps like Rails and RSpec. The development team has grown to four core members and the JRuby community has 15 or more regular contributors and dozens of users. The potential of a JVM-backed Ruby implementation has started to attract the attention of even hardcore Rubyists. JRuby has really arrived this year.
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