Think of your JJ this way....there are four cards that can come that may pair a singleton holding better than your jack. The Q is iffy, because many players won't play Qx against a raise. But then there are 9 cards that can come that are lower than your JJ and won't beat you if they pair a singleton.

You will hit your trips on the flop roughly 12% of the time (2 outs 3x) add the times that you win unimproved and the times you make straights and flushes, and you've got great odds against the 4-5 players. Punish them.