Hi all, I'm following a tutorial on LWJGL.  Here on this page of the tutorial:

https://lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content/chapter5/chapter5.html

... and sorry, I got it sorted.  I had inadvertently copied from two different parts of the code in one chapter that didn't go together.  Well at least I had a guess at what the actual correct answer was before I saw it mentioned in the chapter.

Thanks for reading, nothing to see here.