Spring Framework - BeanFactoryPostProcessor Examples

Spring Framework 

BeanFactoryPostProcessor is an extension point to customize configuration metadata. This example registers a new BeanDefinition with beanFactory.

package com.logicbig.example;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

public class BeanFactoryPostProcessorExample {

public static void main (String[] args) {
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext(MyConfig.class);
MyBean bean = context.getBean(MyBean.class);

public static class MyConfig {
MyConfigBean myConfigBean () {
return new MyConfigBean();

private static class MyConfigBean implements BeanFactoryPostProcessor {

public void postProcessBeanFactory (
ConfigurableListableBeanFactory beanFactory)
throws BeansException {

GenericBeanDefinition bd = new GenericBeanDefinition();
bd.getPropertyValues().add("strProp", "my string property");

((DefaultListableBeanFactory) beanFactory)
.registerBeanDefinition("myBeanName", bd);

private static class MyBean {
private String strProp;

public void setStrProp (String strProp) {
this.strProp = strProp;

public void doSomething () {
System.out.println("from MyBean: " + strProp);


from MyBean:  my string property
WARNING: @Bean method MyConfig.myConfigBean is non-static and returns an object assignable to Spring's BeanFactoryPostProcessor interface. This will result in a failure to process annotations such as @Autowired, @Resource and @PostConstruct within the method's declaring @Configuration class. Add the 'static' modifier to this method to avoid these container lifecycle issues; see @Bean javadoc for complete details.
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