I wish I could take credit (I wasn't on the game engine but rather the matchmaking/store/chatting part), but I was working with some real geniuses there (technical and creative).
Still, by far and away the most interesting Java project I've ever worked on. I'd never heard of so many enterprisey technologies around a game before (unfortunately, I don't know what would be covered under my NDA, so I probably can't say much more than that :).
That bit of code was, umm, complex. The foundation was written before I started on the project and left to the original writers to maintain. I can promise you this: there were more conversations about (and really, more time spent on) how to handle match making than any other topic. The whole company was absolutely passionate about trying to make sure people got matched well (how well they succeeded, I can't answer :).
I'm glad you liked Space Jam. I was really disappointed that the game turned out so basic. Some of the original ideas were much more interesting, but I guess they figured they wouldn't market as well to the target demographic (don't ask me what they were; it was a long time ago).
Still, by far and away the most interesting Java project I've ever worked on. I'd never heard of so many enterprisey technologies around a game before (unfortunately, I don't know what would be covered under my NDA, so I probably can't say much more than that :).