JJ stays overpair, but lot of action

[Dudd]

This is the first hand at this table for everyone involved in the hand, so we're all posters and I have zero reads. Is my overpair still good, or should I have slowed down?

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is UTG+2 with J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $2. MP3 posts a blind of $2. CO posts a blind of $2.
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero (poster) raises</font>, <font color="#666666">1 fold</font>, MP3 (poster) calls, CO (poster) calls, <font color="#666666">3 folds</font>.

Flop: (7.50 SB) 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, CO folds, Hero calls.

Turn: (5.75 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP3 calls.

River: (11.75 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, Hero calls.

Final Pot: 15.75 BB