[BUG][Java] Error when using property of type boolean with enum

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Generating from a model with a boolean property wich contains enums results in code that contains compile errors. I know that this is a rather stupid OpenAPI description, but it is nonetheless valid (and I sadly can't change the input spec I have to use).

openapi-generator version

5.0.1

OpenAPI declaration file content or url

"test": {
  "type": "boolean",
  "description": "Test",
  "example": true,
  "enum": [
    true,
    false
  ]
}

This results in:

  public enum Test{
    TRUE("true"),
    
    FALSE("false");
    ...
  }

Which fails to compile:

error: incompatible types: String cannot be converted to Boolean
    TRUE("true"),

Generation Details

Java with any library results in this issue.

Steps to reproduce

Have any model contain a boolean property with enum values.

Related issues/PRs

None

Suggest a fix

The expected outcome should be:

  public enum Test{
    TRUE(true),
    
    FALSE(false);
    ...
  }

Start by reproducing generation with the supplied boolean enum property using the Java generator and inspect the generated Test enum. Compare the generated enum constructor arguments with the Boolean type, then verify that the generated Java compiles and uses true and false rather than quoted strings.