not able update the data into the database

Not able to update the record in the database using edit controller
I need to edit description from  particular code

getting error

org.springframework.web.bind.MissingServletRequestParameterException: Required String parameter 'code' is not present

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@RequestMapping(value = "/editRights")
			public String editrights(
					HttpServletRequest request,
					HttpServletResponse response,
					@RequestParam("code") String code, 
					@RequestParam("Description") String Strname,
					HttpSession session,
					Model model) {
				
				

				List<Rights> groups = new ArrayList<Rigsht>();
				Rights right = null;
				EntityManager em = ToplinkUtil.getViewableEntityManager( request, "owner" );
				
				try {
					Right1 = Rights.findAll(em);
					right= em.find(Right.class, code);
					em.refresh(code);
					
					model.addAttribute("code", code);
					
			
					return "user/mainGroups";
				} catch (Exception e) {
					return "failure";
				} finally {
					em.close();
				}
			}

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find all method

public static List<Rights> findAll( EntityManager em ) {
    List<WebdUserGroup> results = em.createQuery( "select distinct wug from Rights wug order by wug.code" ).getResultList();
    return results;
  }

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