Part 1: What Really Happens When You Call SpringApplication.run()
1.1. The main() Entry Point — Anatomy of the Startup Every Spring Boot application starts the same way: @SpringBootApplication public class MyApplication { public static void main ( String [] args ) { SpringApplication . run ( MyApplication . class , args ); } } That single line sets the entire machinery in motion. 1.2. Static run() vs. a SpringApplication Instance There are two ways to launch an…
1.5. Getting the Run Listeners — Triggers for the Lifecycle Journey Upon creation, the SpringApplication instance initiates the life cycle by obtaining the run listeners. These listeners are responsible for notifying the application at key moments, such as when it starts or stops. The listeners are initialized via the getRunListeners() method, which takes the command-line arguments as input.
Spring Boot ships with several standard run listeners, including the SpringApplicationRunListeners itself. The starting() method of each listener is called, allowing them to perform any necessary initialization tasks before the application begins its journey.
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