[Bug]: Cannot target java LocalDateTime via type mappings

Description

Using typeMappings I cannot specify a class with in-built support due to reserved word checking.

The OpenAPI specification defined "date-time" as a format value for strings, but that allows anything in ISO-8601. I want to declare in my spec whether it should be local date-time (no suffix), Zulu (Z suffix), or offer (+-nnnn suffix)

I am trying to do this with the following type mappings

typeMappings:
  string+date-time-local: LocalDateTime
  string+date: LocalDate
  string+time: LocalTime
  string+date-time-duration: Duration
  string+date-period: Period
  string+date-time-zoned: ZonedDateTime
  string+date-time-offset: OffsetDateTime
  string+timestamp: Instant

importMappings:
  LocalDateTime: 'java.time.LocalDateTime'
  LocalDate: 'java.time.LocalDate'
  LocalTime: 'java.time.LocalTime'
  ZonedDateTime: 'java.time.ZonedDateTime'
  OffsetDateTime: 'java.time.OffsetDateTime'
  Instant: 'java.time.Instant'
  Duration: 'java.time.Duration'
  Period: 'java.time.Period'

"LocalDate" is treated as a reserved word to avoid conflict between a spec declaring a model of that name and the java.time classes. I do not want to declare anything new but instead actually use the standard java.time classes.

When doing this, I receive this warning [WARNING] LocalDate (reserved word) cannot be used as model name. Renamed to ModelLocalDate, and it generates code using ModelLocalDate. I cannot see any obvious way of achieving what I need to do,.

Swagger Codegen Version

7.13.0 (via maven plugin)

Language / Generator

Java

OpenAPI/Swagger Spec

openapi: 3.1.0
info:
  title: Example
  version: 1.0.0
paths:
  /example:
    post:
      summary: example
      operationId: example
      parameters:
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Example"
components:
  schemas:
    Example:
      type: object
      properties:
        localDate:
          type: string
          format: date-time-local

Steps to Reproduce

Attempt to generate the above OpenAPI specification using the type mappings above.

Expected Behaviour

Code is generated which utilised java.time.LocalDateTime

Actual Behavior

Code is generated using ModelLocalDateTime, which does not compile

Related

This would appear to be related to the changes in https://github.com/OpenAPITools/openapi-generator/pull/16276

Checklist

• I have searched the existing issues to make sure this is not a duplicate.
• I have included a minimal and reproducible spec example.
• I have explained how to reproduce the issue.
• I have specified which generator/language is affected.

Reproduce the issue with the provided OpenAPI 3.1 specification and the shown typeMappings and importMappings through the Maven plugin. Start by tracing the Java generator's reserved-word handling for mapped types; done means the generated code uses java.time.LocalDateTime rather than ModelLocalDateTime and compiles.