<div dir="ltr" style="text-align: justify;" trbidi="on">
<div dir="ltr" style="text-align: justify;" trbidi="on">
<div dir="ltr" style="text-align: justify;" trbidi="on"><b>Singleton Bean Scope: </b>Scopes a single bean definition to a single object instance per <a href="https://dineshonjava.com/2012/06/spring-ioc-container.html">Spring IoC container</a>. This is the default behavior of the <a href="https://dineshonjava.com/2012/06/spring-ioc-container.html">spring container</a>. ; </p>
<div style="color: #274e13;">When a bean is a <b>singleton</b>, only one <i>shared</i> instance of the bean will be managed, and all requests for beans with an<i><b> id or ids</b></i> matching that bean definition will result in that one specific bean instance being returned by the <a href="https://dineshonjava.com/2012/06/spring-ioc-container.html">Spring container</a>.</p>
</div>
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<div style="color: #274e13;">We can say another way, <b>when you define a bean definition and it is scoped as a singleton,</b> then the <a href="https://dineshonjava.com/2012/06/spring-ioc-container.html">Spring IoC container</a> will create <b><i>exactly one</i> <i>instance </i></b>of the object defined by that bean definition. This single instance will be stored in a cache of such singleton beans, and <b><i>all ;</i></b></div>
<div style="color: #274e13;"><b><i><br />
</i></b> <b><i>Lets see with example which show the singleton scope of the &#8216;zeroPoint&#8217; bean in the spring container.</i></b></div>
<div style="color: #274e13;"></div>
</div>
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<p><b><br />
</b> <b>Point.java</b></p>
<pre class="highlight" name="code">package com.dineshonjava.sdnext.beanscope.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><br />
</b> <b>spring.xml</b></p>
<pre class="highlight" name="code"><;beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:><b><br />
</b> <b>DrawingApp.java</b><br />
<pre class="highlight" name="code">package com.dineshonjava.sdnext.beanscope.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");

Point point1 = (Point) context.getBean("zeroPoint");
Point point2 = (Point) context.getBean("zeroPoint");
if(point1 == point2)
 System.out.println("In Singleton Demo >;>; Both are same objects values are.." +
 "n 1. point1= "+point1+" n 2. point2= "+point2);
else
 System.out.println("In Protptype Demo >;>; Both are different objects values are.." +
 "n 1. point1= "+point1+" n 2. point2= "+point2);
 }
}
</pre>
<div style="background-color: #ff99cc; border-width: thin; border: solid;">
<div style="color: blue;"><b>Output:</b></div>
<div style="color: red;">Jun 28, 2012 9:10:46 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh</div>
<div style="color: red;">INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Thu Jun 28 21:10:46 IST 2012]; root of context hierarchy</div>
<div style="color: red;">Jun 28, 2012 9:10:46 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 28, 2012 9:10:46 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons</div>
<div style="color: red;">INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1543c88: defining beans [zeroPoint]; root of factory hierarchy</div>
<p><b>In Singleton Demo >;>; Both are same objects values are..</b><br />
<b>1. point1= com.dineshonjava.sdnext.beanscope.tutorial.Point@1198891 </b><br />
<b>2. point2= com.dineshonjava.sdnext.beanscope.tutorial.Point@1198891</b></div>
<div style="color: #274e13;">
Once you are done with creating source and bean configuration files, let us run the application. If everything is fine with your application, this will print the above message:<b> See the both address value of the object is same.</b></div>
<div style="color: blue;"><b>Bean scopes using annotation:</b></div>
<p><b><br />
</b> <b>spring.xml</b></p>
<pre class="highlight" name="code"><;beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:><div style="color: #274e13;"><br />
Here <b>component-scan</b> element has attribute '<b>base-package</b>'. base-package contain the base package of the Bean class.</div><div style="color: #274e13;"><b><br />
</b> <b>base-package = "com.dineshonjava.sdnext.beanscope.tutorial"</b></div><b><br />
</b> <b>Ponit.java</b><br />
<pre class="highlight" name="code">package com.dineshonjava.sdnext.beanscope.tutorial;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

@Service
@Scope("singleton")
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>
<div style="color: blue;"><b><br />
</b> <b>Annotation @Service:</b></div>
<div style="color: #274e13;"><b>Target </b>: Class</div>
<div style="color: #274e13;"><b>Description</b>:</div>
<div style="color: #274e13;">Here <b>@Service</b> is streotype annotation which declared above the class name that means this class is a bean of the spring container.</div>
<div style="color: #274e13;">In <b>Spring container</b> this bean recognized by the id "<b>point</b>" means that <b>same as the class name except first letter of the class name is the small letter</b>.</div>
<div style="color: #274e13;">for example: class '<b>Point</b>' get as '<b>point</b>' bean</div>
<div style="color: #274e13;"> ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; class '<b>Circle</b>' get as '<b>circle</b>' bean</p>
<div style="color: blue;"><b>Annotation @Scope:</b></div>
<div style="color: #274e13;"><b>Target </b>: Class</div>
<div style="color: #274e13;"><b>Description</b>:</div>
<div style="color: #274e13;">Here <b>@Scope </b>is annotation which declared above the class name that define the scope the bean</div>
<p> ;<b>@Scope("singleton")</b><br />
 ;<b>@Scope("prototype")</b><b> </b><br />
<b><br />
</b></div>
<p><b>DrawingApp.java</b></p>
<pre class="highlight" name="code">import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.dineshonjava.sdnext.beanscope.tutorial.Point;
/**
 * @author Dinesh Rajput
 *
 */
public class DrawingApp 
{
 /**
 * @param args
 */
 public static void main(String[] args) 
 {
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Point point1 = (Point) context.getBean("point");
Point point2 = (Point) context.getBean("point");
if(point1 == point2)
 System.out.println("In Singleton Demo >;>; Both are same objects values are.." +
 "n 1. point1= "+point1+" n 2. point2= "+point2);
else
 System.out.println("In Protptype Demo >;>; Both are different objects values are.." +
 "n 1. point1= "+point1+" n 2. point2= "+point2);
 }
}
</pre>
<div style="background-color: #ff99cc; border-width: thin; border: solid;">
<div style="color: blue;"><b>Output:</b></div>
<div style="color: red;">Jun 28, 2012 10:22:04 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh</div>
<div style="color: red;">INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@145d068: startup date [Thu Jun 28 22:22:04 IST 2012]; root of context hierarchy</div>
<div style="color: red;">Jun 28, 2012 10:22:04 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 28, 2012 10:22:04 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons</div>
<div style="color: red;">INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1cbfe9d: defining beans [point,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy</div>
<p><b>In Singleton Demo >;>; Both are same objects values are..</b><br />
<b>1. point1= com.dineshonjava.sdnext.beanscope.tutorial.Point@84da23 </b><br />
<b>2. point2= com.dineshonjava.sdnext.beanscope.tutorial.Point@84da23</b></div>
</div>
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