Well as far as I can tell OpenJK can help handle for example to play with high poly models. I once downloaded the new Quinlan Vos model which has a great quality and tried to play it with the normal jka singleplayer version but from the moment someone was shoting at me, my game automatically crashed and was giving me the same error you've posted here. While playing jedi academy with OpenJK none of those errors ever appeared to me.