Partial edit a hibernate entity

Please verify if I'm doing this correctly.

Coming from Struts when I want to save a partially edited entity I would do the following. Use the "preparable" interface with a "prepare" method that would get the entity from the ID in request parameters. Then when the action handler method runs the correct Entity is available for request parameter injection and saving via hibernate.

Is the following the CORRECT way to do the same in Spring MVC?

Thanks,
Ben

Code:

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        @RequestMapping(method = RequestMethod.PUT, produces = "text/html")
    public String update(@ModelAttribute("user") @Valid MyUser myUser, BindingResult bindingResult, Model uiModel, HttpServletRequest httpServletRequest) {
        if (bindingResult.hasErrors()) {
            populateEditForm(uiModel, myUser);
            return "myusers/update";
        }
        uiModel.asMap().clear();
        myUser.merge();
        return "redirect:/myusers/" + encodeUrlPathSegment(myUser.getId().toString(), httpServletRequest);
    }
       
        @ModelAttribute("user")
        private MyUser populateMyUserForEdit(@RequestParam(value = "id", required = false) Long id) {
                if (id != null) {
                        return MyUser.findMyUser(id);
                }
                return null;
        }
       
        @InitBinder
    protected void initBinder(WebDataBinder binder) {
                binder.setDisallowedFields("id");
    }

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