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Skills301-frameworks-spring-boot-core

301-frameworks-spring-boot-core

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Updated 10-15 22:39

About this skill

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

Scope: Apply recommendations based on the reference rules and good/bad code examples.

Constraints

Before applying any Spring Boot changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.

  • MANDATORY: Run ./mvnw compile or mvn compile before applying any change
  • SAFETY: If compilation fails, stop immediately — compilation failure is a blocking condition
  • VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
  • BEFORE APPLYING: Read the reference for detailed rules, good/bad patterns, and constraints
  • EDGE CASE: If request scope is ambiguous, stop and ask a clarifying question before applying changes
  • EDGE CASE: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance

When to use this skill

  • Review Java code for Spring Boot application
  • Apply best practices for Spring Boot application in Java code
  • Improve Spring Boot configuration properties and beans
  • Review Spring Boot component scanning and profiles
  • Tune Spring Boot graceful shutdown or virtual threads

Workflow

  1. Read reference and assess project context

Read references/301-frameworks-spring-boot-core.md and inspect the current project setup before proposing changes.

  1. Gather scope and decide target improvements

Identify requested outcomes, constraints, and the minimum safe set of changes to apply.

  1. Apply framework-aligned changes

Implement or refactor configuration/code following the reference patterns and project conventions.

  1. Run verification and report results

Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.

Reference

For detailed guidance, examples, and constraints, see references/301-frameworks-spring-boot-core.md.