使用SpringMVC注解@RequestParam(value="XXX",required=false)时需要注意的问题

错误描述：[java] view plain copy@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： [plain] view plain copyOptional 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： 当可选参数“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，所以赋值失败！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”