[BUG][Spring] generated api interface doesn't have @RequestParam annotation

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I updated openapi-generator from 4.0.1 to 4.0.2. Then, I found generated api interface from same spec is different between 4.0.1 and 4.0.2.

For some reason, @RequestParam is not generated for api parameters. Here is an example.

• 4.0.1

@ApiParam(value = "", allowableValues = "json, csv, tsv", defaultValue = "json")
@Valid
@RequestParam(value = "format", required = false, defaultValue = "json")
Format format

• 4.0.2

@ApiParam(value = "", allowableValues = "json, csv, tsv", defaultValue = "json")
@Valid
Format format

openapi-generator version

4.0.2

OpenAPI declaration file content or url

openapi: 3.0.2
info:
  title: info
  description: info
  version: 0.1.0

paths:
  /example/api:
    get:
      summary: summary
      description: description
      parameters:
      - $ref: '#/components/parameters/requiredQueryParam'
      - $ref: '#/components/parameters/formatParam'
      responses:
        200:
          description: response
          content:
            application/json:
              schema:
                type: string

components:
  parameters:
    requiredQueryParam:
      description: set query
      in: query
      name: query
      required: true
      schema:
        type: string
    formatParam:
      description: set format
      in: query
      name: format
      required: false
      schema:
        $ref: '#/components/schemas/format'

  schemas:
    format:
      default: json
      description: response format
      enum:
      - json
      - csv
      type: string

Command line used for generation

$ mvn clean package
$ java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i ./simple-example-spec/openapi.spec -g spring -o output

Steps to reproduce

Generate api code for spring with 4.0.1 and 4.0.2. Then compare the api parameters of api interface.

Related issues/PRs

I couldn't find any similar issues.

Suggest a fix

Start with the Spring generator entry point used by modules/openapi-generator-cli and reproduce the issue with simple-example-spec/openapi.spec using the provided Maven and Java commands. Compare generated API parameters for versions 4.0.1 and 4.0.2; done means query parameters again include the expected @RequestParam annotations.