NotWritablePropertyException错误

问题遇到的现象和发生背景

发现NotWritablePropertyException

public class Person {
    private Integer age;

    public Person() {
    }

    public Person(Integer age) {
        this.age = age;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {    this.age=age;}

    @Override
    public String toString() {
        return "Person{" +
                "age=" + age +
                '}';
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="person01" class="com.ww.Person">
        <property name="age" value="21"></property>
    </bean>
</beans>

package com.ww;


import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Person {
    @Test
    public void test1(){
        ApplicationContext ioc =
                new ClassPathXmlApplicationContext("ioc.xml");
        Person bean = (Person) ioc.getBean("person01");
        System.out.println(bean.getClass());
        
    }
}

问题相关代码，请勿粘贴截图

感觉是xml连接不上Person

运行结果及报错内容

at com.ww.Person.test1(Person.java:11)
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'age' of bean class [com.ww.Person]: Bean property 'age' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

类重名，

ioc配置文件配置的是这个同名测试类

你这两个类都是Person，配置文件里定义对象的类是第二个Person类，第二个Person类没有setAge方法，所以不能完成age属性的赋值。把配置文件里的bean标签的class属性换成第一个Person类的全限定类名。