J vs R

theres an intresting thread (not exaktly thread, but just some klaim-resp-resp kindoff posts) on the issue of RoR being a disruptive tek n whether it is aktually eorth while for fellow developers to leave java n try something as recent n immature as RoR.
in Order
The Innovator's Dilemma: It's Happening to Java
History repeats itself
RoR Tunnel Vision
Java Tunnel Vision