JJ overpair facing strengh on flop (1/2 on Stars).

With 2 players showing this much strength after your pf 3-bet, I say you're behind and drawing to the 2 remaining J's. In a perfect world you're against A9 and TT, but I think it's more likely you're facing some combo of 99, TT, QQ, A5, A9, or AA/KK that didn't cap pf. Of these you only beat TT and A9, and you have 2 players telling you they are best. This flop might also get capped, in which case I would want to vommit. HU I might call to river, but here I fold with a clear conscience.