Description

When I have an allOf keyword in my request body's schema, I get the following warning three times:
String to be sanitized is null. Default to Object

Swagger-codegen version

Self build with 3.0.0 Branch commit d78362d

Swagger declaration file content

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Test
paths:
  /test:
    post:
      operationId: test
      requestBody:
        required: true
        content:
          application/json:
            schema:
               allOf:
                - $ref: '#/components/schemas/Test'
      responses:
        default:
          description: response...
components:
  schemas:
    Test:
      type: object

Command line used for generation

I tried it with java, jaxrs-cxf-client, jaxrs-cxf, spring and typescript-angular. I can test more languages if needed.

For example: java -jar swagger-codegen-cli.jar generate -l spring -i test.yaml -o test

Steps to reproduce

Use the allOf keyword in request body's schema and generate spring code