Instead of looking to see if Watir works in JRuby, you could just try it out like me:
$ ruby -v jruby 1.7.1 (1.9.3p327) 2012-12-03 30a153b on Java HotSpot(TM) 64-Bit Server VM 1.6.0_37-b06-434-11M3909 [darwin-x86_64] $ gem install watir ... Successfully installed watir-4.0.2 $ irb > require "watir" => true > browser = Watir::Browser.new :firefox => #<Watir::Browser:0x4fcd5906 url="about:blank" title=""> > browser.goto "google.com" => "http://www.google.hr/"
If this is not clear, Vatyr works great on JRuby.
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