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 copy
- 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”