This post is an English summary of the Chinese article.
Lifecycle Stages
A Spring bean typically goes through four stages:
- Instantiation
- Dependency Injection
- Initialization
- Destruction
Mapping to Native Java
- Instantiation: object creation through constructors.
- Dependency injection: assigning collaborators via setters or fields.
- Initialization: calling setup methods after dependencies are ready.
- Destruction: running cleanup methods before container shutdown.
Why Spring Helps
Spring standardizes these phases through built-in callbacks and annotations, so initialization and cleanup logic can be managed consistently with less boilerplate code.