[BUG] [go-server] Code generation failed (maybe infinite recursion?)

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What’s the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What’s the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I found error trying to generate server code using a large yaml definition and noticed the issue. I have been able to reproduce the issue using a set of minimal yaml files.

The cause of error is about the TestType, which has been defined multiple times in multiple files and indirectly referenced.

The error looks like stack overflow caused by infinite recursion.

[main] INFO  o.o.codegen.DefaultGenerator - Model Error not generated since it's a free-form object
Exception in thread "main" java.lang.StackOverflowError
	at org.openapitools.codegen.utils.ModelUtils.hasOrInheritsDiscriminator(ModelUtils.java:1327)
	at org.openapitools.codegen.utils.ModelUtils.hasOrInheritsDiscriminator(ModelUtils.java:1338)
...

openapi-generator version

The docker cli openapitools/openapi-generator-cli

OpenAPI declaration file content or url

Sample yaml files are available in https://github.com/ztai-goog/bugreport/tree/master/openapi_codegen_1

Command line used for generation

docker run --rm \
    -v $PWD:/local openapitools/openapi-generator-cli generate \
    -i /local/petstore.yaml \
    -g go-server \
    -o /local/go_server

Steps to reproduce

cd into the directory of yaml files and run the generation command above.

Related issues/PRs

Suggest a fix

[selimok]

In my case it was a faulty openapi spec which contains cyclic $refs. After fixing that, everything came back to normal.

[selimok]

Same problem here. I tried with different versions of openapi-generator-cli and only working version was 3.3.4 (I didn’t tried older versions) Unfortunately, I’m not allowed to share openapi specs here. But I will try to locate problem cause in the next days.