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Spring Bean Post Processors

BeanPostProcessor gives you a way to do some operations before creating the spring bean and immediately after creating the spring bean. This allows you to add some custom logic before and after spring bean creation. The BeanPostProcessors operate on bean (or object) instances which means that the Spring IoC container instantiates a bean instance and then BeanPostProcessor interfaces do their work.

Notice that the init and destroy methods related to bean are different from bean post processors. BeanPostProcessors are common for all beans. This example clearly shows the difference from them.

To implement bean post processor logic, we need to create a class which implements BeanPostProcessor interface and two of its methods.

package com.java2novice.beans;

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

public class MyBeanInitProcessor implements BeanPostProcessor{

        public Object postProcessAfterInitialization(Object bean, String beanName)
                        throws BeansException {
                System.out.println("before initialization: "+beanName);
                return bean;

        public Object postProcessBeforeInitialization(Object bean, String beanName)
                        throws BeansException {
                System.out.println("after initialization: "+beanName);
                return bean;

Bean class:

package com.java2novice.beans;


import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

public class NetworkManager{

        private HttpURLConnection connection;
        private String urlStr;
        public void setUrlStr(String urlStr){
                this.urlStr = urlStr;
        public void init(){
                System.out.println("Inside init() method...");
                URL obj;
                try {
                        obj = new URL(this.urlStr);
                        //initialize http connection here
                        this.connection = (HttpURLConnection) obj.openConnection();
                } catch (MalformedURLException e) {
                        // TODO Auto-generated catch block
                } catch (IOException e) {
                        // TODO Auto-generated catch block
        public void destroy(){
                        System.out.println("Inside destroy() method...");
                        if(this.connection != null) {
                } catch(Exception ex){
        public void readData(){
                try {
                        int responseCode = this.connection.getResponseCode();
                        System.out.println("Response code: "+responseCode);
                         * do your business logic here
                } catch (IOException e) {
                        // TODO Auto-generated catch block

Xml based configuration file, note that we registered BeanPostProcessor implementor class here:

<beans xmlns=""

    <context:annotation-config />
    <bean id="netManager" class="com.java2novice.beans.NetworkManager">
        <property name="urlStr" value=""/>    
    <bean class="com.java2novice.beans.MyBeanInitProcessor" />

Spring bean demo class:

package com.java2novice.test;

import org.springframework.context.ConfigurableApplicationContext;

import com.java2novice.beans.NetworkManager;

public class SpringDemo {

        public static void main(String a[]){
                String confFile = "applicationContext.xml";
                ConfigurableApplicationContext context 
                                                        = new ClassPathXmlApplicationContext(confFile);
                NetworkManager networkMng = (NetworkManager) context.getBean("netManager");

after initialization: netManager
Inside init() method...
before initialization: netManager
Response code: 403
Inside destroy() method...
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Spring framework examples

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  2. Spring bean java based configuration using @Configuration and @Bean
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  8. Spring Dependency Injection via Constructor
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  12. Spring bean tag properties
  13. Differen types of spring bean scopes
  14. How to inject inner bean in spring?
  15. Set spring bean scope using annotation
  16. How to invoke spring bean init and destroy methods?
  17. Spring bean initialization callback
  18. Spring bean destruction callback
  19. Configure default initialization and destroy method in all spring beans
  20. Spring bean init and destroy methods using annotations
  21. Spring Bean Post Processors
  22. How to read property file in spring using xml based configuration file?
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  25. How to inject date into spring bean with CustomDateEditor?
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  35. Spring expression language basic example using xml based configuration.
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Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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