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I have this error with RC1: ./script/../config/boot.rb:65:Warning: require_gem is obsolete. Use gem instead.
it's harmless; it points that you have obsolete code in boot.rb of your rails app. With Jruby/Rails 1.2.5 is code generated ok, no warnings. However, you've probably met this during running Depot sample application, am I right? The possible fix is to edit the sample, and replace require_gem with gem. But as i said, warning is just harmless - P4. Btw.maybe we could consider creating "samples" subcomponent of ruby componet.
Depot sample application was already fixed. If it was not in Depot sample, you might want to fix your application appropriately (s/require_gem/gem)