Doesn't support @RequestPart CustomObject in Spring Boot

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• What version of the library are you using?

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.2.RELEASE</version>
    <relativePath/>
  </parent>

<dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-boot-starter</artifactId>
      <version>3.0.0</version>
</dependency>

What kind of issue is this?

• Bug report. If you’ve found a bug, spend the time to write a failing test. Bugs with tests or steps to reproduce get fixed faster. Here’s an example: https://gist.github.com/swankjesse/6608b4713ad80988cdc9
  • spring xml/java config that is relevant
  • springfox specific configuration if it makes sense
  • include any output you’ve received; logs, json snippets etc.; and what the expected output should be
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Please take a look at this api which is automatically converted to a form data with 3 properties:

• InteractionQuestionRequest request
• MultipartFile question-image
• MultipartFile winner-image

@PostMapping(value = ServicePath.QUESTIONS)
  public ResponseEntity<RestResult<InteractionQuestionDTO>> createQuestion(
      @RequestPart(name = "request") InteractionQuestionRequest request,
      @RequestPart(name = "question-image", required = false) MultipartFile questionImage,
      @RequestPart(name = "winner-image", required = false) MultipartFile winnerImage) {
    RestResult<InteractionQuestionDTO> result = new RestResult<>();
    result.setData(interactionService.createQuestion(request, questionImage, winnerImage));
    result.setStatus(RestResult.STATUS_SUCCESS);
    result.setMessage(resourceBundle.getMessage("msg.data.get.success"));
    return new ResponseEntity<>(result, HttpStatus.OK);
  }

Springfox swagger successfully display the MultipartFile with no error but any other objects seems to not be parsed into swagger. Example:

[voduku]

Here is my config:

@Bean
  public Docket api(Environment environment, DocumentationCache documentationCache) {
    boolean isLocal = Boolean.parseBoolean(environment.getProperty("api.local", "false"));
    return new Docket(DocumentationType.OAS_30)
        .securityContexts(Collections.singletonList(securityContext()))
        .securitySchemes(Collections.singletonList(apiKey()))
        .host(!isLocal ? environment.getProperty("api.host") : null)
        .apiInfo(apiInfo())
        .protocols(Collections.singleton(isLocal ? "http" : "https"))
        .select()
        .apis(RequestHandlerSelectors.any())
        .paths(PathSelectors.any())
        .build()
        .directModelSubstitute(Pageable.class, SwaggerPageable.class);
  }

[fisco-unimatic]

If I construct my Docket with DocumentationType.OAS_30 instead of DocumentationType.SWAGGER_2, then it works.