<p>In this chapter, we will show you a short hint about how you can access your <b>Spring-ApplicationContext</b> from everywhere in your <b>Application</b>. We&#8217;ll provide our beans with access to the ApplicationContext object by implementing the ApplicationContextAware interface. We&#8217;ll also use BeanNameAware interface to get the name of the bean configured in the Spring XML.</p>
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<h2><b><br />
</b> <b>WHY </b><i style="color: blue;"><b>ApplicationContextAware? </b></i></h2>
<p>Imagine we have <b>an application (e.g. a web or Swing-application)</b> which we now want to be <b>Spring-enabled</b>. Ok, we add the <b>Spring libraries(spring.jar)</b> and the <b>Configuration-file(spring.xml)</b> and create our <b>Spring-bean</b>s. But there are still some <b>old class-files</b> which you can’t use in this way. These files still need access to the Spring-Honeypot where all the goodies exist and you don’t want to redesign your application.</p>
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<p>First, create the class &#8220;<b>ApplicationContextProvider</b> (<b>Triangle class</b>)&#8221;. This class implements the <b>ApplicationContextAware</b>. A bean which implements the <b>ApplicationContextAware</b>-interface and is deployed into the context will be called back on the creation of the bean, using the interface’s <b>setApplicationContext(…) </b>method, and provided with a reference to the context, which may be stored for later interaction with the context.</p>
</div>
<p>In this tutorial, you will see an example of using ApplicationContextAware. The ApplicationContextAware is used when an object required.<br />
<b><br />
</b> <b>Triangle.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.contextAware.tutorial; 
 
import org.springframework.beans.BeansException; 
import org.springframework.beans.factory.BeanNameAware; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.ApplicationContextAware; 
 
public class Triangle implements ApplicationContextAware, BeanNameAware 
{ 
 private Point pointA; 
 private Point pointB; 
 private Point pointC; 
 private ApplicationContext context = null; 
 
 /** 
 * @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 setApplicationContext(ApplicationContext context) throws BeansException 
 { 
 this.context = context; 
 } 
 
 @Override 
 public void setBeanName(String beanName) 
 { 
 System.out.println("Bean name is: "+beanName); 
 } 
} 
</pre>
<p><b>Point.java</b></p>
<pre class="highlight">package com.dineshonjava.sdnext.contextAware.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; 
 } 
} 
</pre>
<p><b>spring.xml</b></p>
<pre class="highlight"><;beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemalocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">; 
 <;bean autowire="byName" class="com.dineshonjava.sdnext.contextAware.tutorial.Triangle" id="triangle">;<;/bean>; 
 
<;bean class="com.dineshonjava.sdnext.contextAware.tutorial.Point" id="pointA">; 
 <;property name="x" value="0">;<;/property>; 
 <;property name="y" value="0">;<;/property>; 
<;/bean>; 
 
<;bean class="com.dineshonjava.sdnext.contextAware.tutorial.Point" id="pointB">; 
 <;property name="x" value="-20">;<;/property>; 
 <;property name="y" value="0">;<;/property>; 
<;/bean>; 
 
<;bean class="com.dineshonjava.sdnext.contextAware.tutorial.Point" id="pointC">; 
 <;property name="x" value="20">;<;/property>; 
 <;property name="y" value="0">;<;/property>; 
<;/bean>; 
<;/beans>; 
</pre>
<p><b>DrawingApp.java</b></p>
<pre class="highlight">package com.sdnext.contextAware.tutorial; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
/** 
 * @author Dinesh Rajput 
 * 
 */ 
public class DrawingApp 
{ 
 /** 
 * @param args 
 */ 
 public static void main(String[] args) 
 { 
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); 
Triangle triangle = (Triangle) context.getBean("triangle"); 
triangle.draw(); 
 } 
} 
</pre>
<div style="background-color: #ff99cc; border-width: thin; border: solid;">
<div style="color: blue;"><b>Output:</b></div>
<div style="color: red;">Jun 30, 2012 3:28:54 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh</div>
<div style="color: red;">INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@145d068: startup date [Sat Jun 30 15:28:54 IST 2012]; root of context hierarchy</div>
<div style="color: red;">Jun 30, 2012 3:28:55 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions</div>
<div style="color: red;">INFO: Loading XML bean definitions from class path resource [spring.xml]</div>
<div style="color: red;">Jun 30, 2012 3:28:55 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons</div>
<div style="color: red;">INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@f11404: defining beans [triangle,pointA,pointB,pointC]; root of factory hierarchy</div>
<p><b>Bean name is: triangle</b><br />
<b>PointA is (0, 0)</b><br />
<b>PointB is (-20, 0)</b><br />
<b>PointC is (20, 0)</b></p>
</div>
</div>
<h3><i style="color: blue;"><b>What is Need for Using ApplicationContextAware</b></i><i style="color: blue;"> <b>in Application?</b></i></h3>
<p>In the previous chapter, we have seen that we create <b>application context object </b>via using <b>a configuration file(spring.xml)</b> but we did this only one time of the<b> application context object</b> using <b>a configuration file (spring.xml)</b> for an entire application.</p>
<p>If we done one time creating <b>application context </b>object and also one time creating <b>triangle </b>bean through the <b>getBean()</b> method because its have &#8220;<b>singleton</b>&#8221; scope and <b>beans pointA, pointB &; pointC</b> are also populated <b>along with triangle bean</b> only one time when <b>triangle </b>bean is initialized even though <b>pointA, pointB &; pointC</b> are the <b>prototypes </b>in scope.</p>
<div style="color: #274e13;">After that, we can not create <b>a</b> <b>new bean pointA, pointB &; pointC</b> objects without creating <b>triangle </b>bean in the <b>Triangle</b> class or <b>anywhere else except the main app(DrawingApp.java)</b>.</div>
<div style="color: #274e13;"></div>
<p>And there is some situation we want to use <b>application context </b>object anywhere else like in bean class(in <b>Triangle </b>class). Suppose the Triangle bean need to <b>application context </b>object for some reasons.</p>
<p>Suppose If we want to create <b>new beans</b> <b>pointA, pointB &; pointC</b> in <b>triangle </b>class then we have to declare pointA<b>, pointB &; pointC</b> beans <b>as prototype bean scope</b>. Now we have to need to access <b>an applicationContext</b> object in the<b> triangle </b><b>bean</b><b> class</b> so because of this we are used <b>ApplicationContextAware</b> interface and this interface is implements by the <b>Triangle</b> bean class for accessing <b>application context </b>object from overriding the following method of the <b>ApplicationContextAware</b> interface.</p>
<pre class="highlight">@override 
public void setApplicationContext(ApplicationContext context) throws BeansException 
{ 
 this.context = context; 
}</pre>
<p><b>In <a href="https://dineshonjava.com/bean-definition-inheritance-in-spring/">Next Chapter</a>, we will discuss </b><a href="https://dineshonjava.com/bean-definition-inheritance-in-spring/"><b>Bean Definition Inheritance in Spring</b></a><b></b><b> in Application.</b></p>
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