Spring @Autowired/@Resource dose not work when bean implements BeanFactoryPostProcessor

Annotation-drived auto injection dose not work for bean instantiation if the bean implements BeanFactoryPostProcessor interface. Both ClassPathXmlApplication and AnnotationConfApplicationContext met this problem, I think wether this should be spring's bug or not. Here are tow examples helping to reproduce:

By XML

package autoinject;

public class BusinessService {
}

package autoinject;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public class SampleBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Autowired
    private BusinessService businessService;

    public BusinessService getBusinessService() {
        return businessService;
    }

    public void setBusinessService(BusinessService businessService) {
        this.businessService = businessService;
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {

    }
}

<?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"
       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.xsd">

    <context:component-scan base-package="com.sogou.bizdev.iflow" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <bean class="autoinject.SampleBeanFactoryPostProcessor" id="sampleBeanFactoryPostProcessor"/>

    <bean class="autoinject.BusinessService" id="businessService"/>

</beans>

package autoinject;

import org.junit.Assert;
import org.junit.Test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AutoInjectTest {

    @Test
    public void testAutoInject() {
        ConfigurableApplicationContext appContext = new ClassPathXmlApplicationContext("classpath:autoinject.xml");
        SampleBeanFactoryPostProcessor beanFactoryPostProcessor = (SampleBeanFactoryPostProcessor) appContext.getBean("sampleBeanFactoryPostProcessor");
        Assert.assertNotNull("NOT INJECTED!!!", beanFactoryPostProcessor.getBusinessService());
    }

}

Output:

......
java.lang.AssertionError: NOT INJECTED!!!

    at org.junit.Assert.fail(Assert.java:89)
    at org.junit.Assert.assertTrue(Assert.java:42)
......

Property businessService is not auto injected for bean sampleBeanFactoryPostProcessor.

By Annotation

package annotationautoinject;

import org.springframework.stereotype.Component;

@Component
public class BookDao {
}

package annotationautoinject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class BusinessService {

    @Autowired
    private BookDao bookDao;

    public BookDao getBookDao() {
        return bookDao;
    }

    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }

}

package annotationautoinject;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

@Component
public class SampleBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Autowired
    private BusinessService businessService;

    public BusinessService getBusinessService() {
        return businessService;
    }

    public void setBusinessService(BusinessService businessService) {
        this.businessService = businessService;
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {

    }
}

package annotationautoinject;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackageClasses = Main.class)
public class Main {
}

package annotationautoinject;

import org.junit.Assert;
import org.junit.Test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class AnnotationAutoInjectTest {

    @Test
    public void testAutoInject() {
        ConfigurableApplicationContext appContext = new AnnotationConfigApplicationContext(Main.class);
        BusinessService businessService = (BusinessService) appContext.getBean("businessService");
        Assert.assertNotNull("businessService IS NULL!!!", businessService);
        Assert.assertNotNull("bookDao IS NOT INJECTED!!!", businessService.getBookDao());
        SampleBeanFactoryPostProcessor beanFactoryPostProcessor = (SampleBeanFactoryPostProcessor) appContext.getBean("sampleBeanFactoryPostProcessor");
        Assert.assertNotNull("sampleBeanFactoryPostProcessor IS NULL!!!", beanFactoryPostProcessor);
        Assert.assertNotNull("businessService IS NOT INJECTED!!!", beanFactoryPostProcessor.getBusinessService());
    }

}

Output:

......
java.lang.AssertionError: businessService IS NOT INJECTED!!!

    at org.junit.Assert.fail(Assert.java:89)
    at org.junit.Assert.assertTrue(Assert.java:42)
......

Property businessService is not auto injected for bean sampleBeanFactoryPostProcessor, but property bookDao is injected for bean businessService.

Tested spring version: 2.5.5, 3.1.0, 4.3.10, 5.2.8

Please help to confirm this problem, thanks.

Comment From: jhoeller

This is by design: BeanFactoryPostProcessor is a very low-level callback and comes before any annotation processing (which is implemented in subsequent BeanPostProcessor callbacks). Either wire up your post-processor explicitly (e.g. using <property>) or use programmatic BeanFactory.getBean calls within the post-processor implementation. Alternatively, consider putting your business-dependent logic into some other location; BeanFactoryPostProcessor is really meant to be an infrastructure callback.

FWIW, a corresponding note can be found in our core beans chapter in the reference documentation.

Comment From: liuming-dev

Thanks for your reply @jhoeller, I'm trying to find other way to do this.