Most Spring Boot developers use @Service, @Component and @Autowired daily, yet few understand the ten‑step lifecycle a bean undergoes—from loading its definition to destruction—information that unlocks advanced features such as custom initialization, AOP, and dynamic proxy creation.
This article explains Spring Boot’s bean lifecycle callbacks, covering InitializingBean and DisposableBean interfaces, @PostConstruct and @PreDestroy annotations, initMethod and destroyMethod configurations, as well as alternative approaches like SmartInitializingSingleton, ContextRefreshedEvent, and AutoCloseable, with code examples and execution order details.
This article explains the three Spring bean initialization callbacks—@PostConstruct, InitializingBean, and init‑method—their fixed execution order, underlying processing mechanisms, code examples, and guidance on choosing the most suitable approach for different development scenarios.
This article explains several Spring Boot techniques for initializing resources at application startup, including CommandLineRunner, ApplicationRunner, @Order, @PostConstruct, InitializingBean, and ApplicationListener, and provides code examples and usage guidelines for each method.
This article explains how Spring's bean lifecycle can be customized using BeanPostProcessor, @PostConstruct, InitializingBean, and initMethod, providing code examples, execution logs, and best‑practice scenarios for extending bean creation and initialization in backend Java applications.
