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Core Quarkus Concepts to Add

1. Advanced REST Features

  • OpenAPI/Swagger Integration: Add @OpenAPIDefinition and document endpoints with @Operation, @Content
  • Pagination & Filtering: Implement query parameters for list endpoints (limit, offset, sort)
  • Request Validation: Add @Valid and @Validated with Bean Validation (JSR 380)
  • Content Negotiation: Support multiple response formats (JSON, XML)

2. Database & Persistence Layer

  • Complex Queries: Add @Query methods in repositories with advanced JPQL
  • Transactions: Implement @Transactional with proper boundary management
  • Relationships: Model One-to-Many, Many-to-Many relationships (User → Orders, Product → Categories)
  • Auditing: Add created_at, updated_at, created_by fields with automatic tracking

3. Security & Authentication

  • JWT Authentication: Implement token-based auth with Quarkus Security
  • Role-Based Access Control (RBAC): Add @RolesAllowed, @PermitAll, @DenyAll
  • Password Hashing: Use BCrypt for secure password storage
  • Request Authorization Filter: Enforce permissions at endpoint level

4. Error Handling & Validation

  • Exception Mappers: Create @Provider exception handlers for different error types
  • Validation Annotations: Use @NotNull, @Email, @Size, custom validators
  • Error Response DTOs: Standardize error responses with error codes and messages
  • Logging Enhancement: Add structured logging (SLF4J) across layers

5. Configuration Management

  • Environment-Based Config: Use @ConfigProperty for dev/prod/test profiles
  • Health Checks: Add SmallRye Health checks (/q/health)
  • Metrics: Integrate MicroProfile Metrics for monitoring
  • Feature Flags: Implement feature toggles for gradual feature rollout

6. Testing Mastery

  • Test Containers: Use Testcontainers for PostgreSQL in integration tests
  • Mocking: Add Mockito for service layer testing
  • REST Client Testing: Test external API integrations
  • Performance Testing: Basic load testing with JMH

7. Real-World Scenarios

  • Multi-Entity Application: Build a complete domain (e.g., E-commerce: Products, Orders, Customers)
  • File Upload/Download: Implement multipart form handling
  • Batch Processing: Add background job scheduling with Quartz
  • Caching: Use Quarkus Cache with Redis/Infinispan
  • Event-Driven: Implement event publishing/consumption with Kafka

8. DevOps & Production

  • Health Endpoints: /q/health, /q/health/ready, /q/health/live
  • Liveness/Readiness Probes: Kubernetes-ready health checks
  • Graceful Shutdown: Handle shutdown hooks properly
  • Container Optimization: Multi-stage Docker builds, native image building

9. Documentation & Best Practices

  • API Documentation: Auto-generated from annotations
  • Code Comments: Document complex business logic
  • Architectural Decision Records (ADRs): Document why choices were made
  • Performance Optimization: Query optimization, lazy loading strategy

Priority Ranking

  1. Start: Request validation + advanced queries → Real-world entities
  2. Then Add: JWT + RBAC → Error handling mappers
  3. Production Ready: Health checks + Metrics → Docker optimization
  4. Advanced: Caching + Async processing → Event streaming