spring3 @RequestPrama 400错误

http://blog.csdn.net/hellostory/article/details/7519358

 

错误描述：

 

@RequestMapping(value = "/index")
    public String index(@RequestParam(value = "action", required = false)
    String action, @RequestParam(value = "notIncludeTypeId", required = false)
    int notIncludeTypeId){
    // .... 省略代码
}

 

      当可选参数“notIncludeTypeId”为空时，系统出现如下错误： 

 

Optional int parameter 'notIncludeTypeId' is not present
but cannot be translated into a null value due to being declared as a primitive type.
Consider declaring it as object wrapper for the corresponding primitive type.

 

错误原因：

    可选参数“notIncludeTypeId”不存在时，Spring默认将其赋值为null，但由于notIncludeTypeId已定于为基本类型int，所赋值失败！

解决方法：

    “Consider declaring it as object wrapper for the corresponding primitive type.”建议使用包装类型代替基本类型，如使用“Integer”代替“int”

 

 

null 和