[BUG][Spring][Array][Ref]: Array enum parameters have invalid default value

[adithyac-spot]

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

Default value tags for arrays have square braces([]) surrounded on them, which would fail because of invalid enum values.

Initial state:

openapi.yaml

openapi: 3.0.3
info:
  version: 1.0.0
  title: Bug Report
  description: Spring generator, array enums

paths:
  /test:
    $ref: 'file.yaml#/paths/~1test'

file.yaml

components:
  parameters:
    pets:
      name: pets
      in: query
      schema:
        type: array
        items:
          $ref: '#/components/schemas/Pet'
        default: [DOG, FISH]

  schemas:
    Pet:
      type: string
      enum:
        - DOG
        - CAT
        - FISH

paths:
  /test:
    get:
      description: Returns ad for a given ad ID.
      operationId: getAd
      parameters:
        - $ref: '#/components/parameters/pets'
      responses:
        '200':
          description: OK
          content:
            text/plain:
              schema:
                type: string
                example: pong

Command Run:

openapi-generator generate -i openapi.yaml -g spring

Actual output:

default ResponseEntity<String> getAd(
        @Parameter(name = "pets", description = "", in = ParameterIn.QUERY)  @Valid
        @RequestParam(value = "pets", required = false, defaultValue = "[DOG, FISH]") List<Pet> pets
    )

Expected Output:

default ResponseEntity<String> getAd(
        @Parameter(name = "pets", description = "", in = ParameterIn.QUERY)  @Valid
        @RequestParam(value = "pets", required = false, defaultValue = "DOG, FISH") List<Pet> pets
    )

Actual output makes spring think that [DOG and FISH] are the provided enums and would fail the request processing.

openapi-generator version

openapi-generator-cli 6.6.0
  commit : 7f8b853
  built  : -999999999-01-01T00:00:00+18:00
  source : https://github.com/openapitools/openapi-generator
  docs   : https://openapi-generator.tech/

Debug info

This bug would not occur if the paths are in the main openapi.yaml file instead of being referenced from the file.yaml

[adithyac-spot]

cc: @wing328

Since you fixed couple of similar issues with array/enums, thought you could help.

[martin-mfg]

Thanks for reporting this issue!
swagger-parser parses the enum default value differently depending on whether it's in a referenced file or not. Which seems strange to me. I opened a bug about this at swagger-api/swagger-parser#1958.