I have some bias from having started on it like 15 years ago... the key thing to me is the toolset : eclipse and maven and code generation templates and mylyn a

I have some bias from having started on it like 15 years ago... the key thing to me is the toolset : eclipse and maven and code generation templates and mylyn and all this stuff just makes it so easy - now sure you can do that in other languages, but the toolset is very mature, written in java primarily and also a lot of the really cool speed tricks are tough as heck to do with a dynamically typed language