[BUG][JAVA] Regression on Java webclient generation with 7.9.0

[nvervelle]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• 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

See first slack thread and second slack thread

When trying to upgrade from openapi-generator 7.8.0 to 7.9.0, I end up with a result that doesn't compile for one specification :

• I'm using Java webclient generation
• The generated api.xxxApi classes include an import of dto.OneOf, but there's no dto package and no OneOf class/interface generated
• The openapi specification I'm using is adapted from this one (removed a few things we don't need, cleaned...). I'm attaching the actual specification I'm using.

The only place where I see oneOf in the openapi specification is for errors with references to components that have just a description.

With 7.8.0 :

• The import is for a correctly named DTO dto.ApiSecureEnvironmentNameGetKeyGet403Response
• The DTO is actually generated in the dto package

Is this a new bug?
Can it be a side effect of #19781 or #19758 ?

openapi-generator version

It's failing with version 7.9.0, but was working with 7.8.0

OpenAPI declaration file content or url

Put on slack here

Generation Details

Steps to reproduce

Related issues/PRs

It may be a side effect of #19781 or #19758

Suggest a fix

[wing328]

here is the spec for those who do not have a slack account:

openapi: 3.0.0

# INFO SECTION
info:
  title: ESP APIs
  version: 23.1.0
  description: "ESP APIs technical reference."
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html

# TAGS
tags:
  - name: Get Key
    description: Get key endpoint
    externalDocs:
      description: Get key Documentation
      url: https://namirialgroup.github.io/esp-docs/integrations/getkey
  - name: Get user
    description: Get user endpoint
    externalDocs:
      description: Get user Documentation
      url: https://namirialgroup.github.io/esp-docs/integrations/token

# PATHS
paths:
  # GET KEY
  /api/secure/{environment_name}/getKey:
    get:
      tags:
        -  Get Key
      summary: Get a authn key to start an authentication flow
      security:
        - ApiKeyAuth: [ ]
      parameters:
        - in: path
          name: environment_name
          schema:
            type: string
          required: true
        - in: header
          name: Esp-Api-Key
          schema:
            type: string
          required: true
        - in: query
          name: level
          schema:
            type: string
          required: true
          description: The authentication level. It should be refered to L1-L2-L3 (The L letter should be removed!)
          example: 1
        - in: query
          name: attributes
          schema:
            type: string
          required: true
          description: The attribute parameter (Base-Full)
          example: Full
        - in: query
          name: spidType
          schema:
            type: string
          required: false
          description: The SPID SAML Purpose value
          example: F - LP - PG - PF - PX
      responses:
        '200':
          description: The authn key
          content:
            text/plain:
              schema:
                $ref: '#/components/schemas/GetKeyResponse'
        '400':
          description: The input parameters are missing or invalid
        '403':
          description: Forbidden error
          content:
            text/plain:
              schema:
                oneOf:
                  - $ref: '#/components/schemas/ApiKeyError'

  #Get User
  /api/secure/{environment_name}/getUser:
    get:
      tags:
        -  Get user
      summary: Get a user JWT
      security:
        - ApiKeyAuth: [ ]
      parameters:
        - in: path
          name: environment_name
          schema:
            type: string
          required: true
        - in: header
          name: Esp-Api-Key
          schema:
            type: string
          required: true
        - in: query
          name: ID
          schema:
            type: string
          required: true
          description: The ESP user identifier
          example: _ecf182c0024338b109397ea3d04ab141
        - in: query
          name: key
          schema:
            type: string
          required: true
          description: The ESP session key
          example: _029da15302d1f7bf8a4ff9826b4489c3
      responses:
        '200':
          description: The authn key
          content:
            text/plain:
              schema:
                $ref: '#/components/schemas/JWTBearerResponse'
        '400':
          description: missing key or ID parameter
        '403':
          description: Forbidden error
          content:
            text/plain:
              schema:
                oneOf:
                  - $ref: '#/components/schemas/ApiKeyError'
                  - $ref: '#/components/schemas/KeyIdNotFound'


externalDocs:
  description: Official ESP documentation
  url: https://namirialgroup.github.io/esp-docs/
servers:
  - url: https://esp-saas.test.namirialtsp.com
    description: (Test Saas)
  - url: https://esp-saas.namirialtsp.com
    description: (Prod Saas)
components:
  securitySchemes:
    ApiKeyAuth:        # arbitrary name for the security scheme
      type: apiKey
      in: header       # can be "header", "query" or "cookie"
      name: Esp-Api-Key  # name of the header, query parameter or cookie
    sslCertificate: # arbitrary name for the security scheme
      type: http
      scheme: basic
  schemas:
    InvalidParameter:
      description: Invalid Request Parameter
    InvaidFinal:
      description: Error code 1 - Invalid final url
    InvalidLevel:
      description: Error code 2 - Invalid level parameter
    InvalidAttributes:
      description: Error code 3 - Invalid attributes parameter
    InvalidAuthnKey:
      description: Error code 4 - Invalid authn key
    AuthnKeyMismatch:
      description: Error code 5 - The authn key has a mismatch with the SP configuration
    MissingAuthnKey:
      description: Error code 6 - The authn key is missing
    GenericAuthError:
      description: Error code 7/8 - Generic authentication error
    RedirectUriMissing:
      description: Error code 9 - The SP redirect uri misses into the configuration
    UnderLevel:
      description: Error code 10 - The authentication level obtained from lower SPID to what is requested through authnKey
    LevelMismatch:
      description: Error code 11 - There is a level mismatch between requested level and authn key level
    CurrentSessionLevel:
      description: Error code 12 - The authentication level of a SPID session already active not corresponding to the currently requested level
    KeyIdNotFound:
      description: Error code 3 - The session is missing for input key and ID parameters
    SSLError:
      description: SSL authentication error
    ApiKeyError:
      description: ApiKey authentication error
    GetKeyResponse:
      type: string
      example: c1BUQkJ4d3hYUWV6ZEQ4TktlSWV6ZmozVy9HNzNrQlcyRFlvMTB1TTlGKzE3dWNjdHNLV2RUN0pVNTNJQnhsVnNMMWhBS0lucGNxMC9qY0c3U3BWYlc5dktOMXFvVkhyYUIrdDFBd1VBWGM5bERzS1RnVzd1V251R3pWUEpiUmc
    JWTBearerResponse:
      type: string
      description: jwt that contains the SAML Assertion attributes
    SessionIdKeyResponse:
      type: string
      description: querystring with session key and id

[wing328]

as a workaround, please set the normalizer rule SIMPLIFY_ONEOF_ANYOF to false

e.g.

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g java -i /tmp/oneof.yaml -o /tmp/oneof2/ --openapi-normalizer SIMPLIFY_ONEOF_ANYOF=false

doc: https://github.com/openapitools/openapi-generator/blob/master/docs/customization.md#openapi-normalizer

[wing328]

UPDATE: filed #20461 to fix the issue (any type handling in normalizer)

[nvervelle]

Hi @wing328 ,

I confirm that setting the normalize rule SIMPLIYFY_ONEOF_ANYOF to false allows me to fix the problem.

Thank you very much !

[wing328]

PR merged.

Please give the fix a try later with the latest master when you've time.

[nvervelle]

Hi, can it wait until you have made a release ?

I ask because the openapi-generator is provided through dependencies that span through several projects, so I can't easily test master on the project that fails with 7.9.0