camel-rest-openapi - Generated produces string is missing media types

[calleandersson]

Bug description

I found a bug in camel-rest-openapi.

The following code exists in RestOpenApiProcessor.java in 4.8.0 and 4.8.1:

// the operation may have specific information what it can produce
if (o.getResponses() != null) {
    for (var a : o.getResponses().values()) {
        Content c = a.getContent();
        if (c != null) {
            produces = c.keySet().stream().sorted().collect(Collectors.joining(","));
        }
    }
}

In main, the code seems to have been refactored into OpenApiUtils.java:

public String getProduces(Operation operation) {
    // the operation may have specific information what it can produce
    if (operation.getResponses() != null) {
        for (var apiResponse : operation.getResponses().values()) {
            Content content = apiResponse.getContent();
            if (content != null) {
                return content.keySet().stream().sorted().collect(Collectors.joining(","));
            }
        }
    }
    return null;
}

In my case, I have a structure which looks like this:

operation
   ...
   responses
      {0}
         key = "200"
         value
            ...
            content
               {0}
                  key = "application/json"
                  value = ...
      {1}
         key = "400"
         value
            ...
            content
               {0}
                  key = "application/problem+json"
                  value = ...
      {2}
         key = "404"
         value
            ...
            content
               {0}
                  key = "application/problem+json"
                  value = ...
      ...

When running the code with 4.8.0, produces is set to application/problem+json. It should be set to application/json,application/problem+json instead.

The code from main also generates wrong result.

[davsclaus]

https://issues.apache.org/jira/browse/CAMEL-21430