[Spring Cert Lesson]🪴⚙️ SPRING APPLICATIONCONTEXT — AND 3 BEAN LOADING WAYS

🔸 TL;DR

The ApplicationContext is Spring’s container. It creates and wires beans, manages scopes & lifecycle, publishes events, and resolves messages. Prefer typed lookups; use names/@Qualifier when multiple beans share a type. ✅

🔸 WHAT IT DOES

▪️ Bean creation & DI (wiring)

▪️ Scopes & lifecycle callbacks (@PostConstruct, @PreDestroy)

▪️ Events (ApplicationEventPublisher)

▪️ Message resolution (i18n)

▪️ Environment & property management 🌱

🔸 MINIMAL BOOTSTRAP (PLAIN SPRING — EXAM-FRIENDLY)

🔸 WITH SPRING BOOT (CONVENIENT, NOT REQUIRED)

🔸 PROGRAMMATIC LOOKUPS — 3 WAYS

🔸 TAKEAWAYS

▪️ Prefer typed lookups for compile-time safety.

▪️ If multiple beans share a type, qualify by name or @Qualifier.

▪️ Use plain Spring bootstrapping for fundamentals (and certification prep).

▪️ Boot is great for app startup ergonomics; the container concepts are the same.

▪️ Close contexts you create (e.g., try-with-resources) to trigger lifecycle hooks. 🔁

#Spring #SpringBoot #Java #DependencyInjection #IoC #Bean #SoftwareEngineering #CleanCode #SpringProfessional #Certification

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