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.
1---2name: 402-frameworks-quarkus-rest-23description: 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 project4license: Apache-2.05---6# Quarkus REST API Guidelines78Apply REST API design principles on Quarkus using Jakarta REST (JAX-RS).910**What is covered in this Skill?**1112- Resource classes, @Path, HTTP method mapping, and resource URI design13- Status codes, Location headers, and Response building14- DTOs and Bean Validation at the boundary; ISO-8601 for date/time fields15- ExceptionMapper for consistent error JSON (RFC 7807 Problem Details)16- API versioning strategies (URI path, Accept header)17- Idempotency with Idempotency-Key header18- Optimistic concurrency: ETag, If-Match, If-None-Match19- HTTP caching with Cache-Control headers20- API deprecation: Sunset and Deprecation headers21- Pagination, sorting, and filtering query parameters22- Optional `/openapi` via SmallRye; API-first contract maintained in `openapi.yaml` (codegen)23- Reactive vs blocking considerations; @RunOnVirtualThread24- Security integration at the filter layer2526**Scope:** Apply recommendations based on the reference rules and good/bad code examples.2728## Constraints2930Before applying REST changes, ensure the project compiles. After applying improvements, run full verification.3132- **MANDATORY**: Run `./mvnw compile` or `mvn compile` before applying any change33- **PREREQUISITE**: Project must compile before applying REST API improvements34- **SAFETY**: If compilation fails, stop immediately35- **BLOCKING CONDITION**: Compilation errors must be resolved by the user before proceeding36- **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements37- **BEFORE APPLYING**: Read the reference for detailed rules and examples3839## When to use this skill4041- Review or improve JAX-RS resources in a Quarkus project42- Design HTTP APIs with validation and error handling on Quarkus43- Add API versioning, idempotency, ETag concurrency, or deprecation headers44- Implement pagination, sorting, or RFC 7807 Problem Details error responses4546## Workflow47481. **Read reference and assess project context**4950Read `references/402-frameworks-quarkus-rest.md` and inspect the current project setup before proposing changes.51522. **Gather scope and decide target improvements**5354Identify requested outcomes, constraints, and the minimum safe set of changes to apply.55563. **Apply framework-aligned changes**5758Implement or refactor configuration/code following the reference patterns and project conventions.59604. **Run verification and report results**6162Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.6364## Reference6566For detailed guidance, examples, and constraints, see [references/402-frameworks-quarkus-rest.md](references/402-frameworks-quarkus-rest.md).
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