Spring ApplicationContext Container Example

The Spring IOC container

Spring IOC container is mainly responsible for instantiating, configuring, and assembling the Spring beans. The Spring container gets instructions on what are objects to instantiate, configure, and assemble by reading configurational metadata. The configurational metadata is represented in XML config file or Java annotations

Spring framework provides the following two types of containers.

BeanFactory container
ApplicationContext container

In this post, we post let’s have a look into the Spring ApplicationContext container using a demo Project.

Spring ApplicationContext Container:

ApplicationContext provides advanced features to our spring applications that make them enterprise-level applications, like i18n, event publishing, JNDI access, EJB integration, Hibernate, etc.

Implementations of ApplicationContext:

ClassPathXmlApplicationContext− It mainly loads bean definitions from XML files located in the project classpath

ApplicationContext ctx = new ClassPathXmlApplicationContext(“ApplicationContext.xml”);

FileSystemXmlApplicationContext− It loads bean definitions from XML files in the file system.

ApplicationContext ctx = new FileSystemXmlApplicationContext(“classpath:ApplicationContext.xml”);

WebXmlApplicationContext− XmlWebApplicationContext is used to represent Spring Container for web applications. By default, Spring creates an object of XmlWebApplicationContext class to represent the application context/spring container for web applications.

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.kkhindigyan.org</groupId>
  <artifactId>SpringApplicationContextContainer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
		<org.springframework.version>5.2.13.RELEASE</org.springframework.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
	</dependencies>
</project>

<groupId>com.kkhindigyan.org</groupId>

<artifactId>SpringApplicationContextContainer</artifactId>

<version>0.0.1-SNAPSHOT</version>

<org.springframework.version>5.2.13.RELEASE</org.springframework.version>

</properties>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${org.springframework.version}</version>

</dependency>

</dependencies>

</project>

Message.java

package com.kkhindigyan.model;

public class Message {
	
	private Integer messageId;
	private String message;
	
	public Integer getMessageId() {
		return messageId;
	}
	public void setMessageId(Integer messageId) {
		this.messageId = messageId;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
}

package com.kkhindigyan.model;

public class Message {

private Integer messageId;

private String message;

public Integer getMessageId() {

return messageId;

}

public void setMessageId(Integer messageId) {

this.messageId = messageId;

}

public String getMessage() {

return message;

}

public void setMessage(String message) {

this.message = message;

}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

	<bean id="message" class="com.kkhindigyan.model.Message">
		<property name="messageId" value="101"></property>
		<property name="message" value="Welcome to Spring Framework!!"></property>
	</bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

https://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd">

</bean>

</beans>

Client Programs:

ClientTest.java

package com.kkhindigyan.org;

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

import com.kkhindigyan.model.Message;

public class ClientTest {

	public static void main(String[] args) {
		
		ApplicationContext applicationContext = null;
		
		try {
			
			//Creating Instance of ApplicationContext Spring Container
			applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
			
			//Asking Spring Container to return Spring bean with id "message"
			Object object = applicationContext.getBean("message");
			//Covert Spring bean into your business Object
			Message message = (Message)object;
			
			//Print Spring bean state
			System.out.println(message.getMessageId()+"\t"+message.getMessage());
			
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if (applicationContext != null)
				((AbstractApplicationContext) applicationContext).close();
		}
	}
}

package com.kkhindigyan.org;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.kkhindigyan.model.Message;

public class ClientTest {

public static void main(String[] args) {

ApplicationContext applicationContext = null;

try {

//Creating Instance of ApplicationContext Spring Container

applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");

//Asking Spring Container to return Spring bean with id "message"

Object object = applicationContext.getBean("message");

//Covert Spring bean into your business Object

Message message = (Message)object;

//Print Spring bean state

System.out.println(message.getMessageId()+"\t"+message.getMessage());

} catch (Exception e) {

e.printStackTrace();

}finally {

if (applicationContext != null)

((AbstractApplicationContext) applicationContext).close();

}

ClientTest2.java

package com.kkhindigyan.org;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.kkhindigyan.model.Message;

public class ClientTest2 {

	public static void main(String[] args) {
		
		ApplicationContext applicationContext = null;
		
		try {
			
			//Creating Instance of ApplicationContext Spring Container
			applicationContext = new FileSystemXmlApplicationContext("classpath:applicationContext.xml");
			
			//Asking Spring Container to return Spring bean with id "message"
			Object object = applicationContext.getBean("message");
			//Covert Spring bean into your business Object
			Message message = (Message)object;
			
			//Print Spring bean state
			System.out.println(message.getMessageId()+"\t"+message.getMessage());
			
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if (applicationContext != null)
				((AbstractApplicationContext) applicationContext).close();
		}
	}
}

package com.kkhindigyan.org;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.kkhindigyan.model.Message;

public class ClientTest2 {

public static void main(String[] args) {

ApplicationContext applicationContext = null;

try {

//Creating Instance of ApplicationContext Spring Container

applicationContext = new FileSystemXmlApplicationContext("classpath:applicationContext.xml");

//Asking Spring Container to return Spring bean with id "message"

Object object = applicationContext.getBean("message");

//Covert Spring bean into your business Object

Message message = (Message)object;

//Print Spring bean state

System.out.println(message.getMessageId()+"\t"+message.getMessage());

} catch (Exception e) {

e.printStackTrace();

}finally {

if (applicationContext != null)

((AbstractApplicationContext) applicationContext).close();

}

If you run ClientTest.java & ClientTest2.java as Java Application then it will give the below output:

101 Welcome to Spring Framework!!

That’s all about Spring ApplicationContext Container Example

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