Spring Framework

What Is Spring, and How the Ecosystem Fits Together Spring is a family of projects that together form the de facto standard for enterprise Java development. The base layer is the ...

The IoC Container and ApplicationContext The IoC container is the machinery that instantiates, configures, and assembles your beans and manages their full lifecycle. In modern ...

Dependency Injection: Constructor and Setter Dependency injection (DI) means an object receives the things it needs from outside instead of creating them itself. Spring supports ...

@Component, @Service, and @Repository Spring turns annotated classes into beans through component scanning. The framework provides a family of stereotype annotations, and while ...

Bean Scopes: Singleton, Prototype, and More A bean's scope decides how many instances the container creates and how long each lives. The default is enough for most code, but ...

@Configuration and @Bean: Programmatic Wiring Not everything fits component scanning, and that is what @Configuration classes are for. They are plain Java classes with methods ...

@Autowired and Qualifier Selection Even with modern constructor injection, you will meet @Autowired and friends in existing code, and you will eventually need qualifiers to choose ...

Spring AOP Basics: Cross-Cutting Concerns Aspect-oriented programming (AOP) extracts behavior that repeats across many methods - logging, transactions, security - into reusable ...

Profiles and Property Sources Applications behave differently per environment: a dev setup uses H2 in memory, production uses a managed database and stricter logging. Spring ...

How Boot's Auto-Configuration Builds on Spring Spring Boot feels like magic until you realize it is built almost entirely from core Spring features. Auto-configuration is a ...