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Spring - Implementing ApplicationContextAware Interface

[Last Updated: Jun 11, 2021]

This example shows how ApplicationContextAware interface can be used to access short-lived scoped bean from a long-lived scoped bean.

Example

A prototype bean

package com.logicbig.example;

import java.time.LocalDateTime;

public class MyPrototypeBean {

  private String dateTimeString = LocalDateTime.now().toString();

  public String getDateTime() {
      return dateTimeString;
  }
}

A singleton bean implementing ApplicationContextAware interface

package com.logicbig.example;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class MySingletonBean implements ApplicationContextAware {

  private ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
      this.applicationContext = applicationContext;
  }

  public void showMessage() {
      MyPrototypeBean bean = applicationContext.getBean(MyPrototypeBean.class);
      System.out.println("Hi, the time is " + bean.getDateTime());
  }
}

Main class

package com.logicbig.example;

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

@Configuration
public class AppConfig {

  @Bean
  @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
  public MyPrototypeBean prototypeBean() {
      return new MyPrototypeBean();
  }

  @Bean
  public MySingletonBean singletonBean() {
      return new MySingletonBean();
  }

  public static void main(String[] args) throws InterruptedException {
      AnnotationConfigApplicationContext context =
              new AnnotationConfigApplicationContext(AppConfig.class);
      MySingletonBean bean = context.getBean(MySingletonBean.class);
      bean.showMessage();
      Thread.sleep(1000);

      bean = context.getBean(MySingletonBean.class);
      bean.showMessage();
  }
}

Output

Hi, the time is 2021-05-05T01:40:59.551
Hi, the time is 2021-05-05T01:41:00.563

Example Project

Dependencies and Technologies Used:

  • spring-context 5.3.8: Spring Context. Version Compatibility: 3.2.3.RELEASE - 5.3.8 Version List
    ×

    Version compatibilities of spring-context with this example:

    • 3.2.3.RELEASE
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    Versions in green have been tested.

  • JDK 8
  • Maven 3.8.1

Implementing ApplicationContextAware Interface Select All Download
  • spring-implementing-application-context-aware
    • src
      • main
        • java
          • com
            • logicbig
              • example
                • MySingletonBean.java

    See Also