9d (edited) • Backend
🫘Spring Bean Lifecycle
Every Spring Boot app you’ve ever run quietly creates, wires, and destroys objects for you, in other terms, this is Inversion of Control (IoC), a concept we’ll break down later.
1. Instantiation
Spring creates the bean instance.
2. Dependency Injection
Dependencies are injected (@Autowired, constructor injection, etc.).
3. Initialization (@PostConstruct)
Custom setup logic runs after dependencies are ready.
4. Ready State
Bean is fully initialized and used across the application.
5. Context Shutdown
Application begins shutdown.
6. Cleanup (@PreDestroy)
Cleanup logic runs (closing resources, connections).
7. Bean Destroyed
Bean is removed and becomes eligible for garbage collection.
Bean Scopes (Important)
- Singleton (default): One instance per application
- Prototype: New instance each time requested
- Request / Session: Scoped to HTTP request or session
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🫘Spring Bean Lifecycle
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