java.lang.IllegalArgumentException: Could not resolve placeholder ‘stu.age‘ in value “${stu.age}

1、运行spring boot项目时出现这个错误，java.lang.IllegalArgumentException: Could not resolve placeholder 'stu.age' in value "${stu.age}，代码如下：

package com.xg.stupro.bean;import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;@ConfigurationProperties(prefix = "stu")
@Component
public class Student {@Value("${stu.age}")private int age;@Value("${stu.sex}")private String sex;}

2、出现这种情况的原因，就是配置文件底下出现了问题，检查一下，在resources底下的application.yml底下配置文件写错了，或者没有这个属性，修改下这个文件即可：

server:port: 8080stu:##年龄age: 27##性别sex: '男'

3、重新运行spring boot项目，ok，可以了！

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