"SEVERE exception validating JSON" while parsing pathparameter of openapi-generated request matchers about mockserver

[djordjeandrejevic]

I encountered the exact same issue.

Have you tried downgrading OpenAPI version (from 3.1.0 to 3.0.0)?

That did the trick for me.

Prior to downgrading, I was also importing 3.1.0 OpenAPI spec and only after realizing that Petstore OpenAPI (OpenAPI version 3.0.0) works as expected, I was able to fix this...

[ZeeD]

Keep in mind that the openapi json has been generated from sources (I know that the service relies on python's fastapi project)
I don't know how easy it would be to update the service to generate the openapi specs in a different format, and, btw, I don't have direct access to the project.
Do you know any converter I can use locally to change from 3.1.0 to 3.0.0?