Agent skill

301-frameworks-spring-boot-core

Use when you need to review, improve, or build Spring Boot 4.0.x applications — including proper usage of @SpringBootApplication, component annotations (@Controller, @Service, @Repository), bean definition and scoping, configuration classes and @ConfigurationProperties (with @Validated), component scanning, conditional configuration and profiles, constructor injection, @Primary and @Qualifier for multiple beans of the same type, bean minimization, graceful shutdown, virtual threads, Jakarta EE namespace consistency, and scheduled tasks. Part of the skills-for-java project

View SKILL.md on GitHub Repository
Stars 350
Forks 63

Install this agent skill to your Project

npx add-skill https://github.com/jabrena/cursor-rules-java/tree/main/skills/301-frameworks-spring-boot-core

Metadata

Additional technical details for this skill

author
Juan Antonio Breña Moral
version
0.14.0

SKILL.md

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

When to use this skill

  • Review Java code for Spring Boot application
  • Apply best practices for Spring Boot application in Java code

Reference

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

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