I'm using springdoc in a spring boot application. I have a controller method which its only parameter is annotated with @Schema(implementation = String.class, allowableValues = {"foo", "bar"})
When I check /v3/api-docs, I found there was no enum field for the test parameter in /test endpoint. I did some debugging into the source code and found there may be a bug in the getSchema method in AnnotationsUtils class of module swagger-core-jakarta.
At line 1719, the method resolveSchemaFromType returns a StringSchema without enum, maybe an additional condition schemaAnnotation.allowableValues().length != 0 should be checked.

{ "openapi": "3.0.1", "info": { "title": "OpenAPI definition", "version": "v0" }, "servers": [ { "url": "http://localhost:9090", "description": "Generated server url" } ], "paths": { "/test": { "post": { "tags": [ "hello-controller" ], "summary": "Test schema", "operationId": "test", "parameters": [ { "name": "test", "in": "query", "description": "test request parameter", "required": true, "schema": { "type": "string" } } ], "responses": { "200": { "description": "OK", "content": { "*/*": { "schema": { "type": "string" } } } } } } }, "/test2": { "post": { "tags": [ "hello-controller" ], "summary": "Test2 schema", "operationId": "test2", "parameters": [ { "name": "test", "in": "query", "description": "test request parameter", "required": true, "schema": { "type": "string", "enum": [ "foo", "bar" ] } } ], "responses": { "200": { "description": "OK", "content": { "*/*": { "schema": { "type": "string" } } } } } } } }, "components": {} }
Demo application:
springdoc-demo.zip

Spring Boot: 3.3.1
springdoc-openapi-starter-webmvc-ui: 2.6.0
swagger-core-jakarta: 2.2.22