Stop Spring Boot Application After Execution

Spring Boot Shutdown: Graceful Application Termination

Introduction

A Spring Boot application, known as a Spring Application Context, may register a shutdown hook with the Java Virtual Machine (JVM). When the JVM shuts down, the shutdown hook is invoked, providing an opportunity for the application to perform cleanup tasks before exiting gracefully.

Methods for Terminating a Spring Boot Application

Multiple approaches exist for terminating a Spring Boot application: * JVM Interrupt: Sending an interrupt signal to the JVM (e.g., by pressing Ctrl+C in the console) triggers a shutdown hook. * System Exit: Calling `System.exit()` directly shuts down the application, but it may lead to abnormal termination. * Shutdown Callbacks: Spring provides a more elegant solution with shutdown callbacks, allowing for customizable cleanup tasks.

Using Shutdown Callbacks in Spring

Spring offers two ways to register shutdown callbacks: * `#registerShutdownHook()`: Registers a global shutdown hook for the application context. * `#addCallback()`: Attaches a callback to a specific bean.

Example: Graceful Shutdown with Shutdown Callbacks

```java public class App { @SpringBootApplication public class SpringBootApp { public static void main(String[] args) { SpringApplication.run(SpringBootApp.class, args); Runtime.getRuntime().addShutdownHook(new Thread(() -> { // Cleanup tasks here })); } } } ```

Conclusion

By leveraging shutdown callbacks, Spring Boot applications can ensure graceful termination, allowing for proper cleanup tasks and a smooth exit process. This tutorial has outlined the different methods for shutting down Spring Boot applications and provided a practical example for implementing shutdown callbacks.