JRuby started off looking like a novelty project with little practical use, but in less than a year it's become a practical tool, something with definite advantages over it's more established rivals. IBM, Oracle and Sun are already using it themselves for web apps. Netbeans 6 has rather good support for Ruby built in, and much as I cringe when running Tomcat servers (from a sysadmin's perspective) from a developer's point of view .war files are a definite advantage.
This article describes what happened when some of Sun's Java web developers chose to try JRuby and Ruby On Rails.
I think JRuby is going to do very well in 2008.
Link: Igor Minar's Blog: JRuby on Rails Rewrite of mediacast.sun.com Launched
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