Spring Boot Feature Creation

Scaffolding a Spring Boot REST API feature in Kotlin involves generating layered components: JPA entities, Spring Data repositories, transactional services, DTOs with validation, and REST controllers, followed by MockK test suites for reliable development.

Standard Spring Boot layered architecture separates concerns into JPA entities, repositories, transactional services, DTOs with Bean Validation, and REST controllers, while a GlobalExceptionHandler maps domain exceptions to predictable client responses.

Testing Spring Boot controllers and services in Kotlin uses MockK to mock dependencies, verifying the behavior of transactional services and REST controllers while asserting that domain exceptions are properly mapped by the GlobalExceptionHandler.

Yes, MockK integrates with Spring Boot to test JPA repositories and transactional services, allowing you to mock dependencies and validate the behavior of layered Kotlin components and domain exception handling.

Spring Boot handles domain exceptions consistently by using a shared GlobalExceptionHandler that maps domain-specific exceptions to predictable client responses, ensuring uniform error handling across all REST controllers in the application.

DTOs with Bean Validation are needed in a Spring Boot REST API to enforce data integrity at the controller layer, ensuring that incoming request payloads are validated before being processed by transactional services and mapped to JPA entities.