HTTP Status 400 - Required Long parameter 'id' is not present

HTTP Status 400 - Required Long parameter 'id' is not present

---

type Status report

message Required Long parameter 'id' is not present

description The request sent by the client was syntactically incorrect (Required Long parameter 'id' is not present).

---

Apache Tomcat/6.0.29

代码如下：

@Controller
@RequestMapping("/item/cat")
public class ItemCatController {

@Autowired
private ItemCatService itemCatService;

@RequestMapping("/list")
@ResponseBody
public List getItemCatList(@RequestParam(value="id")Long parentId){
List list = itemCatService.getItemCatList(parentId);
return list;
}
}

访问的URL：http://localhost:8080/taotao-manager-web/item/cat/list

当使用@RequestParam绑定参数时会出现这种情况，第一次访问时无id，需要为其加上默认的id，即@RequestParam("value="id",defaultValue="0")