Hello,

I want to implement something like this:

@Controller
@SessionAttributes("promotion")
class PromotionController {
    @RequestMapping("showPromo")
    void showPromotionInfo(
        @RequestParam("promId") String promotionId,
        @ModelAttribute Promotion promotion, Errors errors
    ) {
        promotion = Promotions.get(promotionId);
        if (promotion == null || promotion.validates() == false) {
            errors.reject("promotion.invalid");
        }
        return "prom";
    }    
}

The code is invalid, wont work and has some bad errors, but I don't know how to write it better.

When user comes to an URL "showPromo?promId=15", controller should validate if the promotion is valid (outdated/non-existent/etc.). If it is valid - it should show it's information and save the promotion to model and session. If it's not - it should show some error about promotion being invalid.

Problem is, I need to save the promotion in the session (for several requests) and don't want to use direct session management. Is it currently possible with Spring? Or am I doing something wrong?

Could you please provide the optimal solution to my problem using Spring 3?

Thanks in advance.