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openapi-to-application-java-spring-boot
Generate a Spring Boot (Java) application from an OpenAPI 3 specification using the spec-first approach: openapi-generator (Maven or Gradle) produces API interfaces and DTOs, you implement controllers, services, persistence, security and tests. Use when asked to build, scaffold or implement a Spring Boot API from an OpenAPI/Swagger file.
skills/openapi-to-application-java-spring-boot/SKILL.md
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# Spring Boot application from an OpenAPI spec
Spec-first: the OpenAPI file is the source of truth. Generate **interfaces and DTOs only** at build time (never commit generated code), then hand-write the implementation. Verified with Spring Boot 4.0.8 and 4.1.1, openapi-generator 7.26.0 (Maven plugin, Gradle Groovy and Kotlin DSL), JDK 21+.
## Step 0: Detect and gather
- Existing `pom.xml` / `build.gradle(.kts)`: keep its build tool and Spring Boot version, **never upgrade implicitly**, add the generator to it. Otherwise create the project with the `create-spring-boot-java-project` skill (dependencies: `web`, `validation`, `actuator`; add `data-jpa`, `postgresql`, `security` only if needed).
- Get the spec (file, URL or pasted) and save it as `src/main/resources/openapi/<name>.yaml`. Accept 3.0.x and 3.1.x; Swagger 2.0 must be converted first.
- Ask only what the spec does not answer: persistence (in-memory vs database), authentication, package name.
## Step 1: Review the spec
Check unique `operationId`s (they become method names), `tags` (they become one interface each), reusable `components/schemas`, `required` lists, validation constraints (`minLength`, `maximum`, `pattern`), error responses and `securitySchemes`. Flag gaps and fix the spec rather than the generated code.
