In a Spring Boot project, when the OpenAPI spec (spec YAML) is provided, use this spec to generate the code for APIs and DTOs rather that building the REST APIs and DTOs at first and then generating spec for them.

If one wants to generate the code from an openapi file, OpenApi Generator Plugin for Maven is quite handy.

I am using openapi and just updated to spring 3. I ran into some issue since spring 3 uses Jakarta and not Javax. Here is a post if you have this issue