Semi-bluff here is the proper play in my mind. Against a J (if hes not holding an A or Q) the percentages are 53.4% - 46.6%, so almost even money. Unless he's a super aggresive player i cant see him coming over the top of this with just a J unless he puts you on a flush draw. But i dont know about calling the push. Your going in the underdog and could only be drawing to your flush outs against set/2pair. So judgment call.