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 Spring > Core > Default Initialization Callback

Default Initialization Callback 

Spring Inversion of Control (IoC) also known as Dependency Injection (DI) is a process by which objects define their dependencies with collaborating objects. The attribute init-method allows us to specify a no-argument method as an initialization callback method. Instead of specifying bean level initialization callbacks Spring provides a way to define it for all beans defined in bean configuration file using default-init-method attribute.

File Name  :  

File Name  :  
package com.bethecoder.tutorials.spring3.basic;

public class SimpleInitBean2 {

  private String simpleProp;

  public String getSimpleProp() {
    return simpleProp;

  public void setSimpleProp(String simpleProp) {
    this.simpleProp = simpleProp;

  public void init() {

    System.out.println("In custom init callback : " + simpleProp);
    simpleProp += "@callback"
    System.out.println("In custom init callback : " + simpleProp);
  public String toString() {
    return "SimpleInitBean2[" + simpleProp + "]";

File Name  :  
Author  :  Sudhakar KV
Email  :  [email protected]
package com.bethecoder.tutorials.spring3.tests.callbacks;

import org.springframework.context.ApplicationContext;

import com.bethecoder.tutorials.spring3.basic.SimpleInitBean2;

public class DefaultInitializationCallback {

   @param args
  public static void main(String[] args) {
    System.out.println("Initializing ApplicationContext");
    ApplicationContext factory = new ClassPathXmlApplicationContext("default_init.xml");
    System.out.println("ApplicationContext Initialized");
    System.out.println("Accessing first bean");
    SimpleInitBean2 first = (SimpleInitBean2factory.getBean("first");

    System.out.println("Accessing second bean");
    SimpleInitBean2 second = (SimpleInitBean2factory.getBean("second");


It gives the following output,
Initializing ApplicationContext
ApplicationContext Initialized

Accessing first bean
In custom init callback : FIRST
In custom init callback : FIRST@callback

Accessing second bean
In custom init callback : SECOND
In custom init callback : SECOND@callback


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