[BUG] [KOTLIN-SPRING-SERVER] Missing @RequestMapping("\${api.base-path:/api/v1}")

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

I tested with the org.openapi.generator Gradle plugin version 7.6.0 and 7.14.0 - It seems that access to the newest version 7.15.0, the Docker images and the openapi-generator-cli JARs are currently restricted (can't download them, possibly a restrictive company network policy on my end).
Sorry about that, I hope this is a valid bug report nevertheless. I can also re-try later if necessary.

Expected: Generator version 7.6.0 outputs a Kotlin interface with the following annotations:

@Validated
@RequestMapping("\${api.base-path:/api/v1}")
interface TenantOrderResultApi {

Actual: Newer versions (7.7.0 onward) output these instead:

@RestController
@Validated
interface TenantOrderResultApi {

Note the missing @RequestMapping with base path.
Because of that, the endpoints are different (they are missing the /api/v1 prefix).

openapi-generator version

• 7.14.0
• Bug already appeared in 7.7.0
• Works in 7.6.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Tenant Order Result API
  version: 1.0.0
servers:
  - url: https://example.com/api/v1
    description: Production server
paths:
  /tenant-order-result/{orderId}:
    post:
      summary: Report the result of ordering a tenant
      operationId: reportTenantOrderResult
      parameters:
        - name: orderId
          description: ID of the production order for ordering a new tenant
          in: path
          required: true
          schema:
            type: string
            example: ABC0123
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TenantOrderResultRequest'
      responses:
        '200':
          description: The result was successfully reported and the corresponding production order was updated.
        '400':
          description: General client error.
        '401':
          description: Client is unauthorized.
        '403':
          description: Client is forbidden to report results.
        '404':
          description: No tenant order with the given ID was found.
        '422':
          description: The tenant order with the given ID is not in work-in-progress or stale.
        '500':
          description: Internal error of <the service> or communication with <another service> failed.
components:
  schemas:
    TenantOrderResultRequest:
      description: Result of ordering a new tenant
      type: object
      properties:
        result:
          type: string
          enum:
            - success
            - failure
        message:
          type: string
          description: |-
            Additional internal information about the success or failure.
          example: Successfully processed tenant order for 'ExampleTenant'
      required:
        - result
        - message

Generation Details

Config section in build.gradle.kts:

tasks.register<GenerateTask>("generateTenantOrderResultServer") {
    configFile.set("$rootDir/openapi/generator-config-server.yaml")
    inputSpec.set("$rootDir/openapi/Tenant_Order_Result_API.yaml")
    outputDir.set(layout.buildDirectory.dir("generate-resources/tenantorderresultapi").get().toString())
    packageName.set("com.example.tenantorderresultapi")
    generateApiTests.set(false)
    generateModelTests.set(false)
    additionalProperties.set(
        mapOf(
            "basePackage" to "com.example.tenantorderresultapi"
        )
    )
}

generator-config-server.yaml:

generatorName: kotlin-spring
useSpringBoot3: true
interfaceOnly: true
skipDefaultInterface: true

Steps to reproduce

• Add the above section to your Gradle build script
• Save the OpenAPI spec to a file /openapi/Tenant_Order_Result_API.yaml
• Save the config to a file /openapi/Tenant_Order_Result_API.yaml
• Run ./gradlew generateTenantOrderResultServer (or gradle generateTenantOrderResultServer if you don't use the Gradle Wrapper)
• Check the interface TenantOrderResultApi in /build/generate-resources/tenantorderresultapi/...

Related issues/PRs

Suggest a fix

Re-add the generation of @RequestMapping("\${api.base-path:/api/v1}") or other code that sets the base path.

Start with the Gradle generation task, generator-config-server.yaml, and the supplied OpenAPI declaration, then inspect the generated TenantOrderResultApi interface. Reproduce the output with ./gradlew generateTenantOrderResultServer and compare it with the expected @RequestMapping base path; done means the generated Kotlin interface includes that annotation and preserves the /api/v1 prefix.