[BUG][codegen] String enum value NO transforms to FALSE

[fizzet]

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Bug Report Checklist

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

Description

I have a YAML file that contains a string enum type:

    countryCode:
      type: string
      enum:
        - DE
        - FR
        - NO
        ...

In the generated Java code (jaxrs-cxf), this transforms to

public enum CountryCode {
  
  DE("DE"),
  FR("FR"),
  FALSE("false"),
  ...

Obviously, the last entry should be NO("NO") instead.

openapi-generator version

openapi-generator-maven-plugin 4.3.1

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix

[hleb-albau]

Also, enum value OFF transaforms to false too

[DmitrySboychakov]

Same here, OFF->false. Is there known fix/workaround?

[TheAwesomeGem]

Same here. What could be causing this?

[DmitrySboychakov]

That's actual problem with the YAML parser ( even more - not a problem, that's valid behavior), we need to add single or double quotes to the schema to fix that.
For example:

    countryCode:
      type: string
      enum:
        - 'DE'
        - 'FR'
        - 'NO'
        ...