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# spring

## Basic idea

The de facto JVM application framework. Built around dependency injection (the IoC container), AOP, and a vast ecosystem of starters (Spring Boot) for web, data, security, messaging.

## Key facts

* IoC container manages bean lifecycle and wires dependencies.
* Spring Boot: opinionated auto-configuration + embedded server.
* Stereotypes: `@Component`, `@Service`, `@Repository`, `@Controller`.
* Major modules: Spring MVC, Spring Data, Spring Security, Spring Cloud.