ArchitectThe first three topics of every volume are live. New topics are added in rounds across all volumes, so the whole path grows evenly.
Spring Core, IoC & Dependency Injection
1.1 Why Spring ExistsThe enterprise-Java problems Spring was created to solve — and the philosophy that still shapes Spring Framework 71.2 Spring Framework ArchitectureThe functional building blocks of Spring — from the core container up to web, data, security and integration1.3 Spring ModulesHow the Spring Framework is packaged into modules — core container, data access, web, testing, integration, messaging and securitySpring AOP, Proxies, Events & Transactions
1.1 Cross-Cutting ConcernsLogging, security, transactions, auditing, metrics and caching — behaviour that belongs to every module and none1.2 Why Cross-Cutting Concerns Are DifficultCode duplication, tangling, scattering and their cost to maintainability1.3 Aspect-Oriented ProgrammingAspect, join point, pointcut, advice and weaving — the vocabulary of modular cross-cutting behaviourSpring Boot, Configuration & Application Lifecycle
1.1 Why Spring Boot ExistsSpring configuration complexity, dependency management, embedded servers and production readiness1.2 Spring Boot ArchitectureSpringApplication, ApplicationContext, auto-configuration and starter dependencies — how the pieces fit together1.3 Spring Boot vs Spring FrameworkRelationship, differences and when Spring Boot is usefulSpring MVC, REST & Web Applications
1.1 MVCModel, View and Controller — the pattern and its Spring implementation1.2 DispatcherServletFront controller, request routing, handler selection and response processing1.3 MVC Request LifecycleHTTP request → DispatcherServlet → HandlerMapping → Controller → Service → ResponseSpring Data, JPA & Persistence
1.1 Repository AbstractionRepository, CRUD, paging and sorting1.2 Spring Data ArchitectureRepository interfaces, repository proxy and query generation1.3 Repository TypesCrudRepository, ListCrudRepository, PagingAndSortingRepository and JpaRepositorySpring Security, OAuth2 & Identity
1.1 Security ArchitectureAuthentication, authorization, principal and SecurityContext1.2 Security Filter ChainRequest → security filters → authentication → SecurityContext → authorization → controller1.3 Security ContextSecurityContext, Authentication, principal and authoritiesSpring Integration, Testing & Cloud-Native Development
1.1 Enterprise IntegrationMessaging, channels, endpoints and adapters1.2 Integration PatternsMessage channel, router, filter, transformer, aggregator and splitter1.3 Messaging SystemsKafka, RabbitMQ, JMS and cloud messaging
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