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Groovy is not Java.

But it's a brilliant example of everything that could possibly go wrong if you blindly optimize for hello world

Or you get jealous of the runtime errors the JS, Rails and Python teams have.

Or invent entirely new classes of errors with static type annotations that are actually utterly ignored.

Neither is the final sample presented in the article! But I think the point is that Groovy already exists and can run most Java programs as well.