[Java - Spring refer to properties in $ref get Compilation error in generated class although it is valid swagger yml ]

Q&A (please complete the following information)

• OS: [e.g. Windows 10 Enterprise]
• Browser: [e.g. chrome]
• Version: [e.g. 71.0.3578.98]
• Method of installation: [use online swagger editor https://editor.swagger.io/]
• Swagger/OpenAPI version: [e.g. Swagger 2.0, OpenAPI 3.0]

Content & configuration

Example Swagger/OpenAPI definition:

swagger: '2.0'
host: api.vodafone.com
basePath: '/{access}/eligibleProductOfferingAPI/v2'
schemes:
  - https
consumes:
  - application/json
produces:
  - application/json
info:
  title: 'Common Service Model API: EligibleProductOffering'
  version: 2.1.0
paths:
  /eligibleProductOffering:
    get:
      tags:
        - eligibleProductOffering
      description: >-
        A method that allows a consumer of the API to get-list a
        EligibleProductOffering representation.
      operationId: getList
      produces:
        - application/json
      responses:
        '204':
          description: '204, No Content.'
definitions:
  eligibleProductOfferingVBOProductOffering:
    properties:
      id:
        type: array
        minItems: 1
        items:
          $ref: '#/definitions/BasicComponents/properties/IDType'
      name:
        type: string
        description: ' The name of the instance of a business object or component.'
  BasicComponents:
    properties:
      IDType:
        type: object
        properties:
          value:
            type: string
            description: The value of the field.
          schemeID:
            type: string
          schemeName:
            type: string
          schemeAgencyName:
            type: string
        required:
          - value
`


### Describe the bug you're encountering

Bug is in class EligibleProductOfferingVBOProductOffering.java get id attribute
  private List<BasicComponentspropertiesIDType> id = null;
where class  BasicComponentspropertiesIDType not found. 
expected attribute id  with type BasicComponentsIDType

### To reproduce...

Steps to reproduce the behavior:
1. Go to 'https://editor.swagger.io/'
2. Paste above yml
4.Click on Generate Server then Spring
5.Spring-server-generated.zip downloaded,  open it and go to  spring-server\src\main\java\io\swagger\model\EligibleProductOfferingVBOProductOffering.java
6. Found compilation error in class generated.

### Expected behavior
expected that id attribute in  EligibleProductOfferingVBOProductOffering.java be
private List<BasicComponentsIDType> id = null;
instead of
private List<BasicComponentspropertiesIDType> id = null;

Start with the provided Swagger 2.0 YAML and reproduce the issue through Swagger Editor's Spring server generation. Inspect the generated spring-server/src/main/java/io/swagger/model/EligibleProductOfferingVBOProductOffering.java and the related generated model type; done means the project compiles and the id field uses BasicComponentsIDType rather than BasicComponentspropertiesIDType.