Optional int parameter ‘id‘ is present but cannot be translated into a null value

接收参数时遇到的问题

开始的代码

@RequestMapping("/deleteComment")@ResponseBodypublic ResultInfo deleteComment(@RequestParam(value = "comment_id",required = false) int comment_id,@RequestParam(value = "id",required = false) int id) {return commentService.deleteComment(comment_id,id);}

错误如下
Optional int parameter ‘id’ is 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.
这段文字的意思如下
可选的int参数“id”是存在的，但是由于声明为原始类型，所以不能被转换成空值。考虑将其声明为对应原语类型的对象包装器
就是你定义的某个方法的参数，但是这个参数是非必须的，系统会自动给这个字段赋值为null，但是你的字段类型为int，int不能接收null值，所以会报如上的错误。解决办法就是使用包装类 Integer。

修改后的代码

@RequestMapping("/deleteComment")@ResponseBodypublic ResultInfo deleteComment(@RequestParam(value = "comment_id",required = false,defaultValue = "0") Integer comment_id,@RequestParam(value = "id",required = false,defaultValue = "0") Integer id) {return commentService.deleteComment(comment_id,id);}

将int 改为Integer，并给了默认值为0，业务层好使用。

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