The meaning of my message wasn't that everyone should move to a functional language, but that Java devs shouldn't. The language has some decent features. Under all the OO patterns and abuses of framework, there was a decent core to save. My issue is that the community has declined to write their own "Java - the good parts", and tried to bolt half a dozen pair of wings on their supertanker because planes are faster than boats.

As a java-turned-haskell-turned-java dev, I can enjoy some OO programing, even though I prefer FP, but I definitely don't enjoy unprincipled FP riddled with side-effects, null pointers and built upon the quicksands of frameworks that are thoroughly unfit for that purpose.