This moes down to whether or not you want to bet your stack that none of those five limp/callers have that jack. The table is obviously weak, I think that this is a situation where you could wait for a better spot.

That being said it is also possible that you have the best hand. I like a decent checkraise of the raiser. If youre going to play the hand, then play it, define your hand on the flop. If not, check fold the flop. If dude is calling a big checkraise, then youre beat. At the least you have a tarnished image, and hopefully itll pay off in later hands.

I tell you what, tho, I HATE playing underpairs OOP with 5 callers.