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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

88

Quality

85%

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Impact

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SecuritybySnyk

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SKILL.md
Quality
Evals
Security

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.

Repository
jabrena/cursor-rules-java
Commit

7772a1b

Last updated
Created

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