Roy Hayun presented his "JRuby on ME" talk this past JavaOne and got a pretty solid response. He ported a pre-1.0 JRuby to CDC by incrementally stripping out libraries and functionality that couldn't be supported. He succeeded, and yesterday delivered to us a buildable version of his JRubME 0.1 (that name was a typo on his original JavaOne submission...but the missing 'y' produced a comically good
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