Practice dependency injection, Spring MVC, JPA, and microservices with enterprise Java scenarios
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Understand JPA, repositories, and database access patterns
Learn Spring Cloud, REST APIs, and distributed systems
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Spring Core and dependency injection
Spring MVC and REST controllers
Spring Data JPA and repositories
Spring Security and authentication
Spring Boot auto-configuration
Microservices with Spring Cloud
A: DI provides dependencies to classes instead of classes creating them. Types: Constructor injection (recommended, immutable), Setter injection (optional dependencies), Field injection (not recommended, hard to test). Use @Autowired, @Inject, or constructor. Spring manages bean lifecycle and dependency resolution.
A: All are stereotype annotations for Spring component scanning. @Component: generic component. @Service: business logic layer. @Repository: data access layer, adds exception translation. Functionally similar but convey intent. @Controller for web layer. Help organize code and enable layer-specific features.
A: Auto-configuration automatically configures Spring application based on classpath dependencies. Uses @Conditional annotations to enable beans. Example: if H2 on classpath, auto-configures DataSource. Override with application.properties or custom @Configuration. View auto-configuration report with --debug. Reduces boilerplate configuration.
A: Spring Data JPA creates repository implementations automatically. Extend JpaRepository<Entity, ID> for CRUD methods. Query methods: findByName, findByAgeGreaterThan (method name parsing). Custom queries: @Query annotation. Pagination, sorting included. Reduces boilerplate DAO code.
Master Spring Boot starters and how they simplify dependency management
Understand Spring MVC request flow and @RestController vs @Controller
Know Spring Security for authentication and authorization
Practice with Spring Data JPA and query methods
Understand application.properties/yml configuration and profiles
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