Dinesh on Java

void afterPropertiesSet() throws Exception

public class Triangle implements InitializingBean
{
     @Override
     public void afterPropertiesSet() throws Exception
     {
       //To do some initialization works here
       System.out.println("InitializingBean init method is called for Triangle");
     }
}

<bean class="com.dineshonjava.sdnext.callbackLifecycle.tutorial.Triangle" id="triangle" init-method="myInit"></bean>

public class Triangle
{
  public void myInit()
  {
     //To do some initialization works here
     System.out.println("My init method is called for Triangle");
  }
}

public class Triangle
{
  //init callback
  @PostConstruct
  public void myInit()
  {
     //To do some initialization works here
     System.out.println("My init method is called for Triangle");
  }
}

Destruction callbacks

void destroy() throws Exception

public class Triangle implements DisposableBean 
{
     @Override
     public void destroy() throws Exception
     {
       //To do some Destruction works here
       System.out.println("DisposableBean destroy method is called for Triangle");
     }
}

<bean class="com.dineshonjava.sdnext.callbackLifecycle.tutorial.Triangle" destroy-method="cleanUp" id="triangle"></bean>

public class Triangle
{
  public void cleanUp()
  {
     //To do some Destruction works here
     System.out.println("cleanUp method is called for Triangle");
  }
}

public class Triangle
{
  //destroy callback
  @PreDestroy
  public void myInit()
  {
     //To do some Destruction works here
     System.out.println("cleanUp method is called for Triangle");
  }
}

If you are using Spring’s IoC container in a non-web application environment; for example, in a rich client desktop environment; you register a shutdown hook with the JVM. Doing so ensures a graceful shutdown and calls the relevant destroy methods on your singleton beans so that all resources are released.

Triangle.java

package com.dineshonjava.sdnext.callbackLifecycle.tutorial;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;


public class Triangle implements InitializingBean, DisposableBean
{
 private Point pointA;
 private Point pointB;
 private Point pointC;
 /**
  * @param pointA the pointA to set
  */
 public void setPointA(Point pointA) {
  this.pointA = pointA;
 }

 /**
  * @param pointB the pointB to set
  */
 public void setPointB(Point pointB) {
  this.pointB = pointB;
 }

 /**
  * @param pointC the pointC to set
  */
 public void setPointC(Point pointC) {
  this.pointC = pointC;
 }

 public void draw()
 {
System.out.println("PointA is ("+pointA.getX()+", "+pointA.getY()+")");
System.out.println("PointB is ("+pointB.getX()+", "+pointB.getY()+")");
System.out.println("PointC is ("+pointC.getX()+", "+pointC.getY()+")");
 }

 @Override
 public void afterPropertiesSet() throws Exception
 {
System.out.println("InitializingBean init method is called for Triangle");
 }

 @Override
 public void destroy() throws Exception
 {
System.out.println("DisposableBean destroy method is called for Triangle");
 }
 
 public void myInit()
 {
   System.out.println("My init method is called for Triangle");
 }
 
 public void cleanUp()
 {
   System.out.println("cleanUp method is called for Triangle");
 }
}

Point.java

package com.dineshonjava.sdnext.callbackLifecycle.tutorial;

public class Point
{
 private int x;
 private int y;
 /**
  * @return the x
  */
 public int getX() {
  return x;
 }
 /**
  * @param x the x to set
  */
 public void setX(int x) {
  this.x = x;
 }
 /**
  * @return the y
  */
 public int getY() {
  return y;
 }
 /**
  * @param y the y to set
  */
 public void setY(int y) {
  this.y = y;
 }
}

Spring.xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:>
Once you are done with creating source and bean configuration files, let us run the following application. If everything is fine with your application, this will print the following message:
package com.dineshonjava.sdnext.callbackLifecycle.tutorial;

import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


/**
 * @author Dinesh Rajput
 *
 */
public class DrawingApp 
{
 /**
  * @param args
  */
 public static void main(String[] args) 
 {
AbstractApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
context.registerShutdownHook();
Triangle triangle = (Triangle) context.getBean("triangle");
triangle.draw();
 }

}


Output:
Jul 1, 2012 2:48:33 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Sun Jul 01 14:48:33 IST 2012]; root of context hierarchy
Jul 1, 2012 2:48:33 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Jul 1, 2012 2:48:33 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1543c88: defining beans [triangle,pointA,pointB,pointC]; root of factory hierarchy
InitializingBean init method is called for Triangle

My init method is called for Triangle

PointA is (0, 0)

PointB is (-20, 0)

PointC is (20, 0)
Jul 1, 2012 2:48:33 PM org.springframework.context.support.AbstractApplicationContext doClose
INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Sun Jul 01 14:48:33 IST 2012]; root of context hierarchy
DisposableBean destroy method is called for Triangle

cleanUp method is called for Triangle