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Spring AnnotationConfigApplicationContext Example

By Arvind Rai, November 16, 2021
On this page we will learn using Spring AnnotationConfigApplicationContext class.
1. The AnnotationConfigApplicationContext is the standalone application context that accepts @Configuration classes as well as plain @Component classes.
2. It also accepts JSR-330 compliant classes using javax.inject annotations.
3. We can register classes using register(Class<?>...) method or can scan a specified base package using scan(String...) method.
4. In case of multiple @Configuration classes, the @Bean methods defined in later classes will override those defined in earlier classes.
5. The AnnotationConfigApplicationContext is introduced in Spring 3.0.

The AnnotationConfigApplicationContext has following methods.
register: Register one or more @component classes or @Configuration classes.
registerBean: Register a bean from the given bean class, using the given supplier for obtaining a new instance.
scan: Perform a scan within the specified base package.
setBeanNameGenerator: Sets a custom BeanNameGenerator.
setEnvironment: Propagate the given custom Environment.
setScopeMetadataResolver: Set the ScopeMetadataResolver to use for registered component classes.



With @Configuration

AppTest.java
package com.concretepage;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class AppTest {
	public static void main(String[] args) {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
 
		ctx.register(AppConfig.class);
		ctx.refresh();

		Entitlement ent= (Entitlement)ctx.getBean("entitlement");
	        System.out.println(ent.getName());		
	        System.out.println(ent.getTime());
	
	}
} 
AppConfig.java
package com.concretepage;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig  {
	@Bean(name="entitlement")
	public Entitlement entitlement(){
		Entitlement ent= new Entitlement();
		ent.setName("Entitlement");
		ent.setTime(20);
		return ent;
	}
} 
Entitlement.java
package com.concretepage;
public class Entitlement {
	private String name;
	private int time;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getTime() {
		return time;
	}
	public void setTime(int time) {
		this.time = time;
	}
} 

Reference

Class AnnotationConfigApplicationContext
POSTED BY
ARVIND RAI
ARVIND RAI










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