spring-mvc-webflux-api-builder

To generate Kotlin Spring Boot controllers and DTOs, define an endpoint contract and run the builder to automate controller creation, DTO boundaries, @field: validation annotations, and consistent error models across your project.

The best way to handle validation and error models in Spring MVC and WebFlux is using a contract-first approach that respects existing project conventions, ensuring consistent exception mappings and avoiding Kotlin and Jackson serialization pitfalls.

Yes, you can use this approach for both Spring MVC and WebFlux stacks, as the builder ensures compatibility with the repository's Spring stack by respecting project conventions and existing error models across both reactive and blocking endpoints.

Jackson serialization fails with Kotlin DTOs when validation annotations are applied incorrectly, but this contract-driven API builder avoids those Kotlin and Jackson pitfalls by enforcing proper @field: validation annotation usage and explicit request and response boundaries.

Scaffold tests for Spring API endpoint contracts by defining the endpoint contract first, which generates web-layer test stubs that verify endpoint contracts and serialization behavior across the repository's Spring stack.