have you tried libgdx?

Unity3d – awesome assets pipeline and awesome docs. Just read the whole manual (took about a week for me, including “reference guide”, which you could read only when you have to deal with components) – and you’re pretty much ready to go. No fuck with setting frameworks, no pain with bundling all together (just a bit if you’ll use C#) – it just, well, works!

If you have no prior experience with 3D development, then you might struggle to make a 3D game in 48 hours, as it’s a level of magnitude harder than 2D game programming.

Maybe use lwjgl (lwjgl.org)

It is for java, and there are some tutorials on how to use it.

though a first 3d game in 48hours will be hard i think.

Try JMonkey, i have messed around with it and really has the power to set up a basic 3d engine easily. the code works nicely physics is built in, player and player movement is built in(ish) and if you learn how to use it, then its really nice