Java is capable to render 3D applications!!!

Question

I often heard that java is slow, to slow to use it for bigger 3D applications.
I don't think that's right! Well, now I tested it!
Screen:
http://www.pictureupload.de/originals/9417/030609172251_3d_screen01.jpg
Realtime 3D Applications with shaders, light, shadows, whatever are no problem with java. I'm just wondering, why nobody use java for 3D games??
I can understand, if someone say, C++ is faster, but java is platform independent and as I tested, fast enough for nice games.

Answer 1

of course it is no problem for java, because java doesn't deal with that stuff. It is handled by the NATIVE underlying 3D API and drivers, plus the video hardware does all the work anyway. There are already two solid OpenGL bindings for Java through JOGL and LWJGL. I'm sure a Direct3D version will also come eventually.
The trick with java game development is not in the graphics department but more in memory management (stay inside a theoretical low max heap space, minimize the number of objects being created/released during a frame cycle, etc.) and efficient networking I/O. Next to that debugging a bad OpenGL call is harder to do than in C++, because it usually causes the native binary to crash, leaving you only with a crash report and no stacktrace.
But I must say, what you can do in C++ in two weeks, you can do in Java in one week. It really does make game development a whole lot easier IMO. Or I just suck at doing proper C++ of course :)