request /v3/api-docs Returns the encoded base64 string with spring-framework 7.0.2

[sgerke-1L]

Describe the bug

The endpoint /v3/api-docs returns base64 encoded JSON instead of the plain JSON. This comes after upgrading to spring-frame 7.0.2 (from spring-framework 7.0.1)

To Reproduce
Use org.springdoc:springdoc-openapi-starter-webmvc-ui with spring framework 7.0.2 and observe the API response to /v3/api-docs

Expected behavior

JSON should be returned directly

Additional context
A work-arround is available:

@Configuration
class WebConfig : WebMvcConfigurer {
    override fun configureMessageConverters(builder: HttpMessageConverters.ServerBuilder) {
        // TODO: Remove this once 
        builder.addCustomConverter(ByteArrayHttpMessageConverter())
    }
}

However, this affects all controllers and might not work in all projects.

[bnasslahsen]

@sgerke-1L,

The issue cannot be reproduced with the current Spring Boot version (4.0.1).
You might have custom HttpMessageConverter.

Please provide a Minimal, Reproducible Example — including a HelloController that demonstrates the problem using a supported Spring Boot version.

It appears you may be using a fixed Spring version that has not been tested or is not supported by springdoc-openapi. Any risks associated with using such a version are your responsibility.

This ticket will be closed for now, but it can be reopened once a reproducible sample is provided.

[xtermi2]

For me the fix was to put the ByteArrayHttpMessageConverter in front of the Converter list like this:

@Configuration
public class SwaggerConfig { 
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public ByteArrayHttpMessageConverter byteArrayHttpMessageConverter() {
        return new ByteArrayHttpMessageConverter();
    }
}

[sgerke-1L]

In the meantime, this has been fixed upstream, though I can't tell you when and where. In any case, we were able to remove the work-around again.