GET it from http://jruby.org/
There is a download page, download and exract the tar file somehwere.
I put it in /System/Library/Frameworks/JRuby.framework/jruby-1.5.1
I then created a symbolic link to jruby_current
ln -s jruby-1.5.1/ jruby_current
And then simply add it to my ~/.bash_profile
$vi ~/.bash_profile export PATH=/System/Library/Frameworks/JRuby.framework/jruby_current/bin:$PATH #Reload the profile… $. ~/.bash_profile #Try out jruby… $jruby -v jruby 1.5.1 (ruby 1.8.7 patchlevel 249) (2010-06-06 f3a3480) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_17) [x86_64-java]
Now you can add the JRuby SDK to your Java Module in Intellij:
Now you can have ruby and Java in the same project. Awesome.