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Java - Write once, debug everywhere.

JavaScript - Write once, run everywhere

This should be the other way around actually.

JavaScript - Write everywhere, run once?

Until the first error in the console ;-)

Indeed. As much as people love to bitch about Java, I've never had to patch applications because it was on a different platform.

Javascript however... Let's just say that you can count on IE to make sure you'll have to patch your code at least once.