| name | 402-frameworks-quarkus-rest |
| description | Use when you need to design, review, or improve REST APIs with Quarkus REST (Jakarta REST) — including resource classes, HTTP methods, status codes, request/response DTOs, Bean Validation, exception mappers, optional runtime OpenAPI exposure (SmallRye), contract-first generation from OpenAPI, content negotiation, pagination, sorting and filtering, API versioning, idempotency (Idempotency-Key), optimistic concurrency (ETag / If-Match), HTTP caching (Cache-Control), API deprecation (Sunset / Deprecation headers), RFC 7807 Problem Details, ISO-8601 for time in contracts, and security-aware boundaries. This should trigger for requests such as Review or improve JAX-RS resources in a Quarkus project; Design HTTP APIs with validation and error handling on Quarkus; Add API versioning, idempotency, ETag concurrency, or deprecation headers; Implement pagination, sorting, or RFC 7807 Problem Details error responses. Part of cursor-rules-java project |
| license | Apache-2.0 |
| metadata | {"author":"Juan Antonio Breña Moral","version":"0.15.0-SNAPSHOT"} |
Quarkus REST API Guidelines
Apply REST API design principles on Quarkus using Jakarta REST (JAX-RS).
What is covered in this Skill?
- Resource classes, @Path, HTTP method mapping, and resource URI design
- Status codes, Location headers, and Response building
- DTOs and Bean Validation at the boundary; ISO-8601 for date/time fields
- ExceptionMapper for consistent error JSON (RFC 7807 Problem Details)
- API versioning strategies (URI path, Accept header)
- Idempotency with Idempotency-Key header
- Optimistic concurrency: ETag, If-Match, If-None-Match
- HTTP caching with Cache-Control headers
- API deprecation: Sunset and Deprecation headers
- Pagination, sorting, and filtering query parameters
- Optional
/openapi via SmallRye; API-first contract maintained in openapi.yaml (codegen)
- Reactive vs blocking considerations; @RunOnVirtualThread
- Security integration at the filter layer
Scope: Apply recommendations based on the reference rules and good/bad code examples.
Constraints
Before applying REST changes, ensure the project compiles. After applying improvements, run full verification.
- MANDATORY: Run
./mvnw compile or mvn compile before applying any change
- PREREQUISITE: Project must compile before applying REST API improvements
- SAFETY: If compilation fails, stop immediately
- BLOCKING CONDITION: Compilation errors must be resolved by the user before proceeding
- 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
- Review or improve JAX-RS resources in a Quarkus project
- Design HTTP APIs with validation and error handling on Quarkus
- Add API versioning, idempotency, ETag concurrency, or deprecation headers
- Implement pagination, sorting, or RFC 7807 Problem Details error responses
Workflow
- Read reference and assess project context
Read references/402-frameworks-quarkus-rest.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 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/402-frameworks-quarkus-rest.md.
