✅ 1. What is the Spring Bean Lifecycle?

The Spring Bean Lifecycle defines the series of steps a Spring bean goes through from creation to destruction within the application context.

🔹 Lifecycle Steps:

1. Instantiation – Spring creates the bean instance.
   
   

2. Populate Properties – Spring injects dependencies via constructor/setters/fields.
   
   

3. Set Bean Name (BeanNameAware)
   
   

4. Set Bean Factory (BeanFactoryAware)
   
   

5. Set ApplicationContext (ApplicationContextAware)
   
   

6. Pre-initialization (BeanPostProcessor#postProcessBeforeInitialization)
   
   

7. Custom init method (@PostConstruct or init-method)
   
   

8. Post-initialization (BeanPostProcessor#postProcessAfterInitialization)
   
   

9. Bean is ready for use
   
   

10. Destroy (@PreDestroy or destroy-method)

✅ 2. How is Spring Boot different from Spring?

Spring Boot = Spring + Auto Configuration + Starter Dependencies + Embedded Server