This article explains how Spring Boot launches an application by invoking SpringApplication.run(), initializing the SpringApplication instance, and executing the run method, detailing each internal step, configuration loading, listener handling, and context refresh with illustrative code examples.
This article explains the various ways to execute code during a Spring Boot application's startup, comparing Java static blocks, constructors, @PostConstruct methods, and Spring's ApplicationRunner and CommandLineRunner interfaces, including ordering with @Order and providing sample code and execution results.
This article provides a step‑by‑step technical analysis of Spring Boot's startup process, breaking down the creation of SpringApplication, the configuration of application type, initializers, listeners, and the eight phases executed by the run() method, complete with code snippets and diagrams.
This article explains the five ways Spring Boot can execute code during application startup—including CommandLineRunner, ApplicationRunner, ApplicationListener, @PostConstruct, and InitializingBean—detailing their usage, ordering, argument parsing, and best‑practice recommendations.
