Who says Java isn't good for 3D games?

A few months ago I was talking with some developers at work about how Java can be used for any kind of application you can think of, even 3D games. Some of them didn't believe that Java could do 3D games because they thought it was too slow. I showed them jMonkeyEngine screenshots and they were very surprised. These are professional quality games that look like any other game you'd buy in a store. And to show it can perform, here is a demo reel:


After 4 years of development, this 3D engine reached v1.0 on October 19 2007. I wish I knew game theory :/ Even if I could make a game I probably wouldn't have time.