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Lately (thanks to Spring) I’ve been toying with dynamic languages a little bit running on top of java. I haven’t delved into JRuby on Rails yet, but I have been using them as scripted beans injected into java classes, largely in a way that exposes an application API to either a scripted environment, or to take advantage of their dynamic features. I have always loved Groovy, Ruby, and Javascript for two things: closures and the ability to add methods to a class at runtime