spring-http-interface: introduce springHttpClientAdapter, fix paramDoc.mustache

[ibaranga]

Addressing issue #19712

What

• Introduce springHttpClientAdapter useHttpServiceProxyFactoryInterfacesConfigurator for spring-http-interface
• Added an spring-http-interface-specific empty paramDoc.mustache

Why

• Enable selecting different HTTP client implementations when generating Spring HTTP client interfaces
• Provides additional flexibility for users who want to generate non-reactive Spring Boot applications

How

- springHttpClientAdapter: Allows users to choose between different HTTP client implementations used in HttpInterfacesAbstractConfigurator:
- web-client (set by default, to ensure backward compatibility)
- rest-client
- rest-template
- Separate templates for each HttpInterfacesAbstractConfigurator implementation:
- httpInterfacesRestClientConfiguration.mustache
- httpInterfacesRestTemplateConfiguration.mustache
- httpInterfacesWebClientConfiguration.mustache
- Log warning for configuration mismatch
- When reactive: false is used in combination with the reactive web-client, it warns users of potential configuration
mismatches, and suggests switching to rest-template or rest-client for non-reactive configurations.

• spring-http-interface: introduce springHttpClientAdapter, fix paramDoc.mustache #19710 (comment)

• Remove unnecessary paramDoc

  • Added an spring-http-interface-specific empty paramDoc.mustache in JavaSpring/libraries/spring-http-interface/paramDoc.mustache
  • This prevents inheriting the @Parameter annotations from the default Spring template located at JavaSpring/paramDoc.mustache.
  • Otherwise, the generated code includes @Parameter annotations on request body parameters, which were causing compile errors due to missing imports

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@cachescrubber @welshm @MelleD @atextor @manedev79 @javisst @borsch @banlevente @Zomzog @martin-mfg

[ibaranga]

This is marked as deprecated, replacing it with builderFor, which is also in line with the rest of the httpInterfaces*Configuration.mustache templates

[wing328]

please review the errors when you've time: https://github.com/OpenAPITools/openapi-generator/actions/runs/11094295717/job/30896757555?pr=19710

[ibaranga]

@wing328 thanks, fixed!

[wing328]

please review the errors reported by the CI when you've time.

[ibaranga]

please review the errors reported by the CI when you've time.

Thanks again, @wing328, I've just updated the PR!

[wing328]

filed #20129 to trigger all the tests

let's see how that goes

[wing328]

@ibaranga can you please add sample to test the new option similar to #20071 (comment) ?

[davidkarlsen]

It would be good to test this with latest GA version of spring, as #20174 is related

[wing328]

@davidkarlsen do you mind doing a test locally for that?

git checkout -b ibaranga-master master
git pull https://github.com/ibaranga/openapi-generator.git master

[ibaranga]

@wing328, @davidkarlsen, the existing spring-http-interface generator is using internally the HttpServiceProxyFactory#builder(HttpClientAdapter) factory method.

This HttpClientAdapter interface / HttpServiceProxyFactory#builder(HttpClientAdapter) factory method:

• were deprecated in Spring Boot 3.2 in favor of HttpServiceProxyFactory#builderFor(HttpExchangeAdapter).
• were removed in Spring Boot 3.4
• can only be used with WebClient, since there is no spring-provided HttpClientAdapter for RestClient / RestTemplate, unlike the HttpExchangeAdapter replacement

Considering this deprecation and the complexity of maintaining configurations and samples for 3 different client
implementations, I’ve introduced the possibility to generate a HttpInterfacesAbstractConfigurator which depends on a provided HttpServiceProxyFactory instance, rather than specific Spring client implementations.

This can be enabled by setting a new property called useHttpServiceProxyFactoryInterfacesConfigurator to "true";

To ensure backward compatibility with Spring Boot 3.1 and flexibility for Spring Boot 3.2+:

• When useHttpServiceProxyFactoryInterfacesConfigurator is missing or false

  • keep using the Spring Boot 3.1 API (HttpServiceProxyFactory#builder(WebClientAdapter(webClient))) in generated HttpInterfacesAbstractConfigurator classes, based on a provided WebClient instance
  • this will remain functional until Spring Boot 3.4.

• When useHttpServiceProxyFactoryInterfacesConfigurator is true,

  • generate HttpInterfacesAbstractConfigurator classes that depend on a HttpServiceProxyFactory instance, allowing greater flexibility in selecting the underlying HTTP client

The changes on custom HttpInterfacesAbstractConfigurator extensions will be minimal, for example

@Configuration
public class MyConfiguration extends HttpInterfacesAbstractConfigurator {
   // ...
}

// WebClient example
@Bean
public  MyConfiguration myConfiguration(WebClient webClient) {
---      return new MyConfiguration(webClient)
+++      return new MyConfiguration(HttpServiceProxyFactory.builderFor(WebClientAdapter.create(webClient)));
}

// RestTemplate example
@Bean
public MyConfiguration myConfiguration(RestTemplate restTemplate) {
---     return new MyConfiguration(restTemplate)
+++     return new MyConfiguration(HttpServiceProxyFactory.builderFor(RestTemplateAdapter.create(restTemplate)));
}