First Move (11~18) - Code, Learn, Build
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First Move (11~18) - Code, Learn, Build

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← Java Enterprise Development|Level 3: Enterprise Microservices, Framework Architecture & Production Engineering

17. Spring Boot 3 Core: Dependency Injection, IoC Container & Bean Lifecycle

Lesson 17 of 25
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Spring Boot 3 Core: Dependency Injection, IoC Container & Bean Lifecycle

Master Spring Boot 3 application architecture: Inversion of Control (IoC), Dependency Injection (`@Autowired`, Constructor Injection), Component Scanning, `@Bean`, and Bean Lifecycles.

Spring Inversion of Control Container

### Spring IoC Container Mechanics 1. **Bean Instantiation**: Spring scans annotated classes (`@Component`, `@Service`, `@Repository`, `@Controller`) and instantiates managed object instances (Beans). 2. **Dependency Injection**: Spring injects dependent bean references via Constructor Injection automatically. 3. **Bean Scopes**: Singleton (default), Prototype, Request, Session.
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