This is a situation that comes up alot. He bets into me but its pretty small. Im thinking its a probe bet from a J, or its someone trying to draw cheap. Reraise or call?

PokerStars No-Limit Hold'em, $0.25 BB (8 handed) FTR converter on zerodivide.cx

Button ($19.15)
SB ($27.50)
BB ($25.20)
UTG ($24.75)
UTG+1 ($16.25)
MP1 ($8.50)
Hero ($28)
CO ($25.90)

Preflop: Hero is MP2 with J, J.
3 folds, Hero raises to $1, 2 folds, SB calls $0.90, 1 fold.

Flop: ($2.25) J, 6, 9 (2 players)
SB bets $1.25