Will experience orbs burn in lava in minecraft?
Solution 1:
Yes, they burn.
I also had a very nasty experience with the server going down due to XP orb lag and tested the lava bath method in 1.8. It seems to work, I did a 2x2 lava pool and when returning from the dead no XP was left at all.
I'm not sure if they fixed the XP orb lag in 1.9Pre but untill I know for sure I take regular cleansing lava baths.