Use when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries, constraint groups, custom constraints, @ConfigurationProperties validation, nested DTO validation, and consistent validation error handling. This should trigger for requests such as Add validation support in Spring Boot; Review Spring Boot validation rules; Improve request validation in Spring Boot REST APIs; Add custom Bean Val…
Use when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries, constraint groups, custom constraints, @ConfigurationProperties validation, nested DTO validation, and consistent validation error handling.
This should trigger for requests such as Add validation support in Spring Boot; Review Spring Boot validation rules; Improve request validation in Spring Boot REST APIs; Add custom Bean Validation constraints in Spring Boot; Validate configuration properties in Spring Boot.
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Skill metadata
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Version0.18.0
LicenseApache-2.0
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author
Juan Antonio Breña Moral
version
0.18.0
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skill mdSKILL.md2,804 B
docsSUMMARY.md654 B
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SKILL.md
Spring Boot Validation Guidelines
Apply Spring Boot validation best practices at API boundaries.
What is covered in this Skill?
Bean Validation annotations on DTOs and command models
@Valid / @Validated on controllers and method parameters
Validation groups for create/update workflows
Custom constraint annotations and validators
Consistent 400 error responses for validation failures
Scope: Apply recommendations based on the reference rules and good/bad examples.
Constraints
Before applying validation changes, ensure the project compiles. After improvements, run full verification.
MANDATORY: Run ./mvnw compile or mvn compile before applying any change
SAFETY: If compilation fails, stop immediately
VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
BEFORE APPLYING: Read the reference for detailed rules and examples
When to use this skill
Add validation support in Spring Boot
Review Spring Boot validation rules
Improve request validation in Spring Boot REST APIs
Add custom Bean Validation constraints in Spring Boot
Validate configuration properties in Spring Boot
Improve nested DTO validation in Spring Boot
Workflow
Read reference and assess project context
Read references/303-frameworks-spring-boot-validation.md and inspect the current project setup before proposing changes.
Gather scope and decide target improvements
Identify requested outcomes, constraints, and the minimum safe set of changes to apply.
Apply framework-aligned changes
Implement or refactor validation-related configuration/code following the reference patterns and project conventions.
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/303-frameworks-spring-boot-validation.md](references/303-frameworks-spring-boot-validation.md).
