kotlin-patterns

Kotlin Spring Boot backend architecture is standardized by applying reusable patterns for entities, services, repositories, and controllers, ensuring consistent design across backend features. The set enforces specific patterns for domain modeling, data access, and REST APIs.

Structuring domain entities and DTOs in Kotlin involves using standard data classes with id, createdAt, and updatedAt fields for entities, and request/response data transfer objects with built-in validation for DTOs. This approach enforces null-safety guidelines.

Implementing a typed repository pattern using JOOQ in Spring Boot involves creating a data access layer that uses DSLContext. This repository pattern orchestrates database interactions while maintaining type safety and coordinating with the service layer.

This Kotlin patterns set supports transactional and idempotent operations within the service layer. The service pattern orchestrates business logic and coordinates repositories while ensuring safe transaction handling and explicit API contracts with OpenAPI annotations.

Defining explicit API contracts for REST controllers in Kotlin uses an API Interface pattern with OpenAPI annotations. Controllers wire to services while DTO patterns handle request and response data transfer objects with validation.

Null-safety practices for modeling domain entities in Kotlin require using safe calls and avoiding force unwraps. The entity pattern enforces standardized data classes while the service and repository layers maintain type safety throughout backend operations.