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🍃 Spring Boot — Complete Guide

The Spring guide is now split into 3 focused sections — each deeply explained for both beginners and senior developers. Pick the section you need, or browse all Q&A below.

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Start Here

Spring Core & Annotations

The foundation: IoC, Dependency Injection, Bean lifecycle, core annotations, Spring Boot auto-configuration, REST API, and Profiles — explained step by step with real-world analogies.

IoC / DI Bean Lifecycle @Autowired Auto-Config Profiles @Value REST Validation

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Advanced Patterns

Advanced Spring & Patterns

Security filter chain and JWT from scratch, AOP internals and the self-invocation trap, caching strategies, @Async internals, and testing with MockMvc and Testcontainers.

Security Filter Chain JWT AOP Proxies @Cacheable @Async @WebMvcTest Testcontainers

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Data & Infrastructure

DB, Messaging & Architecture

JPA Persistence Context, dirty checking, N+1 problem solved every way, @Transactional deep dive, Kafka delivery guarantees, Resilience4j, and zero-downtime deployment.

Persistence Context N+1 Problem @Transactional Spring Data Kafka Circuit Breaker Deployment

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⬇️ The original comprehensive Q&A (280+ questions) is preserved below

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