Spring Boot Core Guidelines

Apply Spring Boot Core guidelines for annotations, bean management, configuration, and dependency injection.

What is covered in this Skill?

• @SpringBootApplication and main application class
• Component annotations: @RestController, @Service, @Repository
• Bean definition, scoping, lifecycle
• Configuration classes and @ConfigurationProperties (with @Validated for fail-fast startup)
• Component scanning and package organization
• Conditional configuration and profiles (@Profile, @ConditionalOn*)
• Constructor dependency injection
• @Primary and @Qualifier for disambiguation when multiple beans share a type
• Bean minimization and composition
• Graceful shutdown for in-flight work
• Virtual threads on supported stacks for concurrency-bound workloads
• Jakarta EE namespace consistency (jakarta.* preferred; avoid mixing legacy javax.annotation / javax.validation)
• Scheduled tasks and background processing