Spring AnnotationConfigApplicationContext Example
November 16, 2021
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());
}
}
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;
}
}
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;
}
}
