Not all static type systems are created equal. The sort of type checking provided by Java (and similar languages) provides far less safety than that of a full-fledged type-inferring language like Scala or Haskell.

I use Ruby and JavaScript professionally. I do like Ruby for a number of reasons, and JavaScript I can at least live with. But in both languages, I constantly find myself spending tons of time tracking down bugs that would have been discovered right away if I had Haskell's type system at my disposal.