Phase 5 - Spring Ecosystem

Goal: Build production Spring Boot applications - REST APIs, security, reactive, batch processing, and server-side rendering. By the end of this phase you can design and implement a fully featured Spring Boot service from scratch and explain exactly what Spring does automatically for you.

Module	Topic	Status
36	Spring Core - IoC container, DI, bean lifecycle, scopes, AOP	✅
37	Spring Boot - auto-configuration, starters, profiles, @ConfigurationProperties, Actuator	✅
38	Lombok & MapStruct - @Data/@Builder/@Slf4j, DTO↔entity mapping, pitfalls	✅
39	Spring REST APIs - @RestController, Bean Validation, @ControllerAdvice, HATEOAS, content negotiation	✅
40	Spring Security - authentication, JWT, OAuth2/OIDC, @PreAuthorize	✅
41	Spring Testing - @SpringBootTest, test slices, Testcontainers, WireMock, contract tests	✅
42	Spring WebFlux & Reactive - Mono/Flux, reactive repositories, backpressure, SSE	✅
43	Thymeleaf - template syntax, layouts/fragments, form handling, security dialect	✅
44	Spring Data REST - auto-generated REST, HAL/HAL-FORMS, projections, event handlers	✅
45	Spring Batch - Job/Step, ItemReader/Processor/Writer, chunk processing, partitioning, retry/skip	✅

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Table of contents

• Module 36 - Spring Core
• Module 37 - Spring Boot
• Module 38 - Lombok & MapStruct
• Module 39 - Spring REST APIs
• Module 40 - Spring Security
• Module 41 - Spring Testing
• Module 42 - Spring WebFlux & Reactive
• Module 43 - Thymeleaf
• Module 44 - Spring Data REST
• Module 45 - Spring Batch