[BUG] [SPRING] not able to get example value in @ApiParam when it is defined in spec

Created by: ashimjk

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 am not able to get an example value in @ApiParam when I tried to generate spring code.

OpenAPI declaration file content

openapi: 3.0.1
info:
  title: Swagger Petstore
  version: 1.0.0
tags:
  - name: pet
    description: Everything about your Pets
paths:
  '/pet/{petId}/{petId2}':
    get:
      tags:
        - pet
      summary: Find pet by ID
      description: Returns a single pet
      operationId: getPetById
      parameters:
        - name: petId
          in: path
          description: ID of pet to return
          required: true
          schema:
            type: integer
            format: int64
            example: 12
        - name: petId2
          in: path
          description: petId2
          required: true
          schema:
            type: string
            example: ashim
      responses:
        '200':
          description: successful operation
          content: {}

Command line used for generation

docker run --rm \
    -v $PWD:/local openapitools/openapi-generator-cli generate \
    -i /local/petstore.yaml \
    -g spring \
    -o /local/out/spring

Steps to reproduce

After the code generation, there is no example in PetApi for petId and petId2.

https://github.com/ashimjk/openapi-ex