Spring Parameter Binding Question

@RequestMapping(value="/read", method = RequestMethod.GET)
    public void read(Model model,@RequestParam("bno") int bno)throws Exception{

        logger.info ("read call");
        model.addAttribute(service.read(bno));
    }

    @RequestMapping(value="/modify", method = RequestMethod.GET)
    public void updateGET(Model model, int bno)throws Exception{

        logger.info ("call to modify page");
        model.addAttribute(service.read(bno));
    }

@RequestMapping(value="/modify", method = RequestMethod.POST)
    public String updatePOST(Model model, BoardVO vo)throws Exception{

        logger.info ("execute the modify function");
        service.update(vo);
        return "redirect:/board/listAll";
    }

@RequestMapping(value="/read", method = RequestMethod.GET)
    public void read(@RequestParam("bno") int bno, 
            @ModelAttribute("cri")Criteria cri,
            Model model)
    throws Exception{

        model.addAttribute(service.read(bno));
    }