Lots of scripting languages run on the Java VM. JRuby has grown into something uniquely important, by embracing the strengths of both Ruby and Java culture. In lightning talk mode, we’ll survey some hybrid projects like celerity and RedCar that are only possible in JRuby, and look at the reasons why. We’ll look at warbler and some multicore metrics, to see how JRuby can help a Rubyist satisfy enterprise demands. For a brief dig into the internals, we’ll see an embedded JRuby interpreter used for web page templating inside an OSGi cloud platform. Finally we’ll take some BDD practices for a spin with Cucumber, to see how a little Ruby influence can impact any development project in any language.