Why can JRuby find my installed gems?
JRuby can only see the gems installed with the gem command shipped with JRuby. The gems installed this way will be stored under $JRUBY_HOME/lib/ruby. If you try to run Rails and get the error, “Cannot find gem for Rails ~>1.2.2.0:” (or whatever version you are using), the problem is probably that you haven’t installed the Rails-gem and its dependencies with the JRuby gem-command.
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