Imported from jabrena/plinth (skills/303-frameworks-spring-boot-validation/SKILL.md). Install upstream with npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation. Copyright stays with the author (Apache-2.0).

Spring Boot Validation Guidelines

Name: 303-frameworks-spring-boot-validation
Author: jabrena

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.

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303-frameworks-spring-boot-validation

About

Spring Boot Validation Guidelines

Constraints

When to use this skill

Workflow

Reference

Use it

Manifest

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