Discussed today w/ Samuel and @dkayiwa:
We strongly suggest that @slubwama & @sthaiya you try upgrading to the new Platform 2.7, as we strongly suspect that the Hibernate upgrades included there should solve this problem. But, if it doesn’t solve the problem, @dkayiwa would really like to know 
Have a look at the instructions here for grabbing Platform 2.7: Announcing OpenMRS Platform 2.7.0 Release - #3 by wikumc
Thank you so much for this post - what a very interesting error!!!