[glun]

I've been investigating their generators for work these last two days, and their java generators produce code that doesn't even compile -- when ran on their own schema examples! Total garbage. OneOf (for the polymorphism aspect of inheritance) is the feature that breaks every single one of them.

[wing328hk]

We just added oneOf support to the Java client generator a few weeks ago. The enhancement will be included in the upcoming 4.3.0 release. You can give it a try with the latest snapshot version for the time being.

Ref: https://github.com/OpenAPITools/openapi-generator/pull/5120