Pointers for making a Java Game?

I am following a Java class at the moment (actually, it's the third Java class) and the final project will be to write a Java game. The teacher told me and 4 other students that we don't have to do all the Exercises and stuff if we do a team project during the whole session. So our game is expected to be more impressive.

Is there good game libraries or some pointer you'd have for making Java games? I don't have a clear idea of what I want to make, I'll pick what Java is best suited for.

You can program (almost?) anything in Java, including fast 3D graphics...

If you search for "java game development" on Google you'll find a lot of useful tutorials and info about game programming in Java.

One of the first Java programs I made long ago (in 1998) was a chess game, with graphics and a chess playing algorithm (not so sophisticated, but it was fun to write and play).