SpringBoot Application Event Listeners

When a spring boot application starts few events occurs in below order

• ApplicationStartingEvent
• ApplicationEnvironmentPreparedEvent
• ApplicationContextInitializedEvent
• ApplicationPreparedEvent
• ApplicationStartedEvent
• ApplicationReadyEvent

These events can be listened by adding an application event listener to the spring boot application as below

• Create a class implementing ApplicationListener<SpringApplicationEvent> interface

public class ApplicationEventListener implements ApplicationListener<SpringApplicationEvent> {

@Override

public void onApplicationEvent(SpringApplicationEvent event) {

log.info( " > " + event );

}

}

• Register the above listener class to the spring boot application main class as

@SpringBootApplication
public class MyApplication {

public static void main(String[] args) {

SpringApplication app = new SpringApplication(MyApplication .class);

app.addListeners(new ApplicationEventListener());

app.run(args);

}

}

• Start the application and all the above events can be seen in the console logs.