Spring报错： org.springframework.beans.factory.support.BeanDefinitionValidationException: Couldn't find an init method named 'init' on bean with name 'car'(待解答)

在Spring工程里，有一个Car类的bean，Main.java主程序，MyBeanPostProcessor.java是Bean后置处理器。

文件目录结构如下：

Car.java

package com.tt.spring.beans.cycle;

public class Car {
    
    private String brand;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
        System.out.println("setBrand...");
    }
    
    public Car(){
        System.out.println("Car's Constructor...");
    }
    
    public void init(){
        System.out.println("init...");
    }
    
    public void destroy(){
        System.out.println("destroy...");
    }

}

Main.java:

package com.tt.spring.beans.cycle;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    
    public static void main(String[] args){ 
        
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans-cycle.xml");
        
        Car car = (Car) ctx.getBean("car");
        System.out.println(car);
        
        ctx.close();
    }

}

MyBeanPostProcessor.java

package com.tt.spring.beans.cycle;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyBeanPostProcessor implements BeanPostProcessor {

    @Override
    public Object postProcessAfterInitialization(Object arg0, String arg1) throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("postProcessAfterInitialization: "+arg0+","+arg1);
        return arg1;
    }

    @Override
    public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("postProcessBeforeInitialization: "+arg0+","+arg1);
        return arg1;
    }

}

bean-cycle.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

   <bean id="car" class="com.tt.spring.beans.cycle.Car"
         init-method="init"
         destroy-method="destroy">
         <property name="brand" value="Audi"></property>
   </bean>
   
   <!-- 配置bean的后置处理器 -->
   <bean class="com.tt.spring.beans.cycle.MyBeanPostProcessor"></bean>
</beans>

之前在xml文件中不配置bean的后置处理器时，运行正常，会init()和destroy()。但是添加了bean的后置处理器之后，

报错如下：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'car' defined in class path resource [beans-cycle.xml]: Invocation of init method failed; nested exception is org.springframework.beans.factory.support.BeanDefinitionValidationException: Couldn't find an init method named 'init' on bean with name 'car'
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.tt.spring.beans.cycle.Main.main(Main.java:11)
Caused by: org.springframework.beans.factory.support.BeanDefinitionValidationException: Couldn't find an init method named 'init' on bean with name 'car'
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1639)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1620)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
... 12 more