Lazy Initialisation breaks WebFlux support

[jonathannaguin]

Describe the bug

• If the application has spring.application.main.lazy-initialization set to true, then it seems the lib drops support for webFlux responses, Mono or Flux.

To Reproduce
Steps to reproduce the behavior:

• What version of spring-boot you are using? Using Spring Boot 2.2.6.RELEASE.
• What modules and versions of springdoc-openapi are you using? org.springdoc:springdoc-openapi-webflux-ui:1.3.2
• What is the actual and the expected result using OpenAPI Description (yml or json)? To support Flux or Mono responses.
• Provide with a sample code (HelloController) or Test that reproduces the problem. A simple controller code like this:

	@ApiResponses(value = { @ApiResponse(responseCode = "200", description = "get All Tweets") })
	@GetMapping("/tweets")
	public Flux<TweetDTO> getAllTweets() {
		Flux<Tweet> tweet = tweetRepository.findAll();
		return tweetMapper.toDTO(tweet);
	}

Expected behavior

• A clear and concise description of what you expected to happen. Regardless of the lazy initialisation setting, the library should behave the same way.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
I tried to debug why this wasn't working and I realized the class WebFluxSupportConverter is not getting invoked at all when the Swagger documentation data gets generated. The bean is created but never invoked.

[bnasslahsen]

@jonathannaguin,

Unable to reproduce. Just tesed on https://github.com/springdoc/springdoc-openapi-demos/tree/master/springdoc-openapi-test-app3.

First of all review your project configuration: This ticket will be closed, and there is no need to reopen a new open for the same issue.

If you are reporting a bug, please help to speed up problem diagnosis by providing as much information as possible: You can update your ticket with the necessary information and it will be reopened.

Please have a look at the contribution guide section Using GitHub Issues:

• https://github.com/springdoc/springdoc-openapi/blob/master/CONTRIBUTING.adoc

[jonathannaguin]

@bnasslahsen I've just tried with the sample app and the problem is there:

The only modification I had to make was on the application.yml:

server:
  servlet:
    context-path: /
  compression:
    enabled: true
    mime-types: text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/json
    min-response-size: 1024
  http2:
    enabled: true
spring:
  resources:
    cache:
      period: 31536000
      cachecontrol:
        max-age: 31536000
    chain:
      html-application-cache: true
      enabled: true
      strategy:
        content:
          enabled: true
          paths: /webjars/swagger-ui/**.*
  main:
    lazy-initialization: true #### CONFIG ADDED
springdoc:
  version: '@springdoc.version@'

Could you please try it out? I can create a fork of that repo if you want too.

[bnasslahsen]

@jonathannaguin,

In fact, i have tested with your first property spring.application.main.lazy-initialization, in the description.
With your second description with the right property spring.main.lazy-initialization, the issue is reproducible and will be fixed for the next release.

[jonathannaguin]

Ah! Apologies! Problem with copying/pasting from the YML file.
I really appreciate your help on this.