在处理项目中Idea中无报错：

问题：

localhost:8080/param/m2在浏览器中输入：localhost:8080/param/m2

产生报错：

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Feb 27 20:55:33 GMT+08:00 2024

There was an unexpected error (type=Internal Server Error, status=500).

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.

原因为：Spring Boot项目误将Integer类型写成int来进行传参

该项目具体的代码为：（错误示范）

@RestController
@RequestMapping("/param")
public class ParamController {

    @RequestMapping("/m1")
    public String m1(String name){
        return "这是你的姓名："+name;
    }

    @RequestMapping("/m2")
    public String m2(String name,int id){  //错误代码，需要将int更改为Integer（包装类）
        return "序列号为："+ id +"这是你的姓名："+name;
    }
}

解决方案：

因此，正确的代码为：（正确示范）

@RestController
@RequestMapping("/param")
public class ParamController {

    @RequestMapping("/m1")
    public String m1(String name){
        return "这是你的姓名："+name;
    }

    @RequestMapping("/m2")
    public String m2(String name,Integer id){  
        return "序列号为："+ id +"这是你的姓名："+name;
    }
}

重启程序，在浏览器输入：localhost:8080/param/m2?id=5&name=zhangsan

运行结果为：

在Postman中测试为：

Bug解决！！