spring-boot

name	spring-boot
description	Spring Boot Java framework. Use when building Spring Boot apps, JPA/Hibernate repositories, REST controllers, Spring Security, Actuator health checks, or profile-based configuration.

spring-boot

Production-grade Java framework with auto-configuration and embedded server for stand-alone applications.

Core Concepts

• Auto-configuration: @EnableAutoConfiguration pulls in beans from classpath dependencies
• JPA/Hibernate: @Entity with JpaRepository interface for CRUD without boilerplate
• REST controllers: @RestController with @RequestMapping for JSON API endpoints
• Spring Security: SecurityFilterChain bean for authentication and authorization rules

Common Patterns

• Actuator: /actuator/health, /actuator/metrics for production observability and monitoring
• Profiles: application-dev.yml/application-prod.yml for environment-specific config
• Testing: @WebMvcTest with MockMvc for controller-layer testing, @DataJpaTest for repos
• Dependency injection: @Autowired or constructor injection with @Service/@Repository beans

Best Practices

• Prefer constructor injection over @Autowired field injection for testability and immutability
• Use @Transactional at the service layer, not the controller, for consistent transaction boundaries
• Keep controllers thin: delegate business logic to @Service classes
• Validate request bodies with @Valid and custom @Constraint annotations

Common Code Patterns

• @RestController @RequestMapping("/api/users") with @GetMapping("/{id}") for REST
• public interface UserRepo extends JpaRepository<User, Long> for auto-implemented CRUD