There are 3 ways to play jacks,,, all wrong 
This is an interesting example of a "value" 3bet/fold.
Obviously coldcalling Jacks is ugly like hell. However 3betting because your range is so much ahead his makes not always sense (we call hands like AJ because we are better).
For a 3bet fold, he has to push better hands(and not bluffs)
and call with worse hands (ok we get out some of his little pockets preflop that could land a suckout on us if we just call so thats good too)
I do make 3bets with Jacks usually because i believe that gives my opponent a chance to 4bet with AA,KK,QQ and call with weaker hands so i dont find it troublesome to go AI on a board with no overcards wich wouldnt work if i'd just flat.
But what kind of weaker hand am i actually expecting him (the avg semitag on nl50) to call me with that has less equity ?
Well if the situation is not steal id probably expect calls from AK and TT, AK usually doesnt hit the flop and i can very often stack TT if no overcards show on the flop, but if i look at his cc range its like TT-QQ & AQs+
Against that range my equity with jacks is no more than 45%.
So i am not really valuebetting for value but i dont consider it a bluff either.
Im doing it to protect my hand against suckout from pp and to allow my opponent to 4bet his superior hand giving me a chance to get away.
I hardly 3bet any good pocketpairs or hands like AK and can get away from a hit. So im basically 3betting to avoid retarded postflop spots.
Since i use elephant i dont really know if i can have a look how well im doing with JJ overall. But i do remember (using pt2) i was a great winner with AA & KK aswell as all pocketpairs, QQ was marginal aswell as jacks and TT was always minus hand ( wich obviously is a joke if im winning with 99 and i could always play TT in the same way)