Alternatively, you can look into LWJGL which is a more complete set of APIs for game development, also giving access to OpenAL and game devices (such as joypads).
If you want to do 2D games with OpenGL, I would look into Slick. It is an easy to use 2D rendering API built on top of LWJGL.
Sun was bought by Oracle and that includes Java as most people know it (certainly as addressed on this site.)
The exact nature of the future of Java itself is uncertain at this time. Not necessarily that it will cease to be but rather how it will evolve.
And JSRs even under Sun were never assured of inclusion in the Java API.
JSR 231 was finalized close enough to Java 6 that it could have been included if there was significant push. If was not part of 7 however then I would expect that at least under Sun it was never going to be part of the Java API (as mentioned other JSRs also fall into that category.)