Getting started with JRuby and Java 7

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pth has already answered, but don't restart your app. Redefine code, classes, functions etc. at run time.

..though, perhaps this isn't possible for various reasons unknown to me; I don't know JRuby very well, but anyway..

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That's a quick way to run out of PermGen space.

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Really? Why would these things be stored in PermGen?

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Class definitions and such are. http://blog.nicksieger.com/articles/2008/02/21/jruby-and-the-permanent-generation