Executing Code Post Spring Boot Initialization

In Spring Boot applications, you may encounter situations where you need to execute specific functions after the application initializes. This is often necessary for monitoring tasks or performing other actions once the application is fully functional. This article explores a solution to this challenge by utilizing the ApplicationReadyEvent event.

Solution Using ApplicationReadyEvent

To execute code after Spring Boot initialization, you can utilize the ApplicationReadyEvent class. This event is triggered after all beans have been initialized, and the application is fully booted. By subscribing to this event, you can run your desired code when the application is ready to process HTTP requests.

The following code snippet demonstrates how to use ApplicationReadyEvent:

@EventListener(ApplicationReadyEvent.class)
public void doSomethingAfterStartup() {
    System.out.println("hello world, I have just started up");
}

This code will output "hello world, I have just started up" to the console when the Spring Boot application completes its initialization process and becomes live. This approach ensures that any code you need to execute after initialization will run after all dependencies are resolved and the application is fully operational.

Compatibility

The solution provided using ApplicationReadyEvent has been tested and verified to work with Spring Boot version 1.5.1.RELEASE. However, it is essential to note that compatibility may vary across different versions of Spring Boot.