Missing Value?

Should I be betting this river for value vs shortstack?

Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

saw flop|saw showdown

Hero ($27.80)
UTG+1 ($19.10)
UTG+2 ($31.60)
MP1 ($22.25)
MP2 ($48.13)
MP3 ($23.53)
CO ($42.18)
Button ($23)
SB ($8.46)
BB ($25.65)

Preflop: Hero is UTG with J, A. CO posts a blind of $0.35. SB posts a blind of $0.10.
Hero calls $0.25, UTG+1 calls $0.25, 4 folds, CO (poster) checks, Button calls $0.25, SB (poster) completes, BB checks.

Flop: ($1.60) A, 2, 9 (6 players)
SB checks, BB checks, Hero bets $1, UTG+1 folds, CO folds, Button calls $1, SB calls $1, BB folds.

Turn: ($4.60) 2 (3 players)
SB checks, Hero bets $2.25, Button folds, SB calls $2.25.

River: ($9.10) 9 (2 players)
SB checks, Hero checks.

Final Pot: $9.10

I would have raised/folded preflop.

As played you have to fear that pair on nines on the board and you played the river fine I think. Had you raised preflop and he called, you'd have reason to believe that he doesn't have trip nines.