Ask HN: What is your favorite Java IDE?

I am new to the world of Java. I have written a ton of code in C++/Python but somehow I find my usual tool Vim not as usable for writing Java code. Since I cant get away without writing Java code, I would greatly appreciate some recommendations on good Mac OSish IDEs apart from the monster in the room (Eclipse). I tried Eclim but it didn't exactly work as well I expected it too.