swagger.yaml

swagger: '2.0'
info:
  description: 'This is a sample server Petstore server.  You can find out more about Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, you can use the api key `special-key` to test the authorization filters.'
  version: 1.0.5
  title: Swagger Petstore
  termsOfService: 'http://swagger.io/terms/'
  contact:
    email: [email protected]
  license:
    name: Apache 2.0
    url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
host: petstore.swagger.io
basePath: /v2
schemes:
  - https
  - http
paths:
  /bar:
    get:
      operationId: getBar
      produces:
        - application/json
      responses:
        '200':
          description: successful operation
          schema:
            type: array
            items:
              $ref: '#/definitions/Bar'
definitions:
  Foo:
    type: object
    properties:
      asdf:
        type: string
    additionalProperties:
      type: object
  Bar:
    type: object
    properties:
      foo:
        $ref: '#/definitions/Foo'

This will generate a faulty Bar class with openapi-generator.
With: Java generator, openapi-generator v4.3.0.