[Java] Using BigDecimal for string+decimal (while having DTO suffix)

I need some help to understand how to configure openapi-generator to use BigDecimal for string+decimal (while having DTO suffix).

On package.json I have:

    "@openapitools/openapi-generator-cli": "2.31.1",

On my yaml file I specified a type:

components:
  schemas:
    BankAccount:
      type: object
      required:
        - id
        - name
        - balance
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
        balance:
          type: string
          format: decimal

For Java, I want it to generate BankAccountDTO and use java.math.BigDecimal for the balance.

I'm using gradle, but it's a simple wrapper to call node command:

val generateServerAPITask = tasks.register<NpxTask>("generateServerAPI") {
    dependsOn("npmInstall")
    dependsOn(createApiOutputDirTask)

    workingDir.set(apiOutputDir)

    val outputDir = apiOutputDir.get().dir("server")

    command.set("@openapitools/openapi-generator-cli")
    args.set(listOf(
        "generate",
        "-i", apiSpecFile.absolutePath,
        "-g", "jaxrs-spec",
        "-o", outputDir.asFile.absolutePath,
        "--model-name-suffix", "DTO",
        "--api-package", "com.ralmeida.txc2.web.ws.api",
        "--model-package", "com.ralmeida.txc2.web.ws.dto",
        "--type-mappings", "string+decimal=BigDecimal",
        "--import-mappings", "BigDecimal=java.math.BigDecimal",
        "--language-specific-primitives", "java.math.BigDecimal",
        "--global-property", listOf(
            "models",
            "apis",
            "supportingFiles=false" // Avoids README and other noise
        ).joinToString(","),
        "--additional-properties", listOf(
            "interfaceOnly=true",
            "useJakartaEe=true",
            "dateLibrary=java8",
            "returnResponse=true",
            "serializationLibrary=jackson",
            "generatePom=false",
            "useSwaggerAnnotations=false",
            "openApiNullable=false",
        ).joinToString(",")
    ))

    inputs.file(apiSpecFile)
    outputs.file(apiOutputDir.get().file("openapitools.json"))
    outputs.dir(outputDir)
}

I've been playing with the arguments but can never make it understand that BigDecimal is part of java... it always seem to try to use a non-existant BigDecimalDTO

> Compilation failed; see the compiler output below.
  /home/ralmeida/development/txc2/web/build/openapi/server/src/gen/java/com/ralmeida/txc2/web/ws/dto/BankAccountDTO.java:4: error: cannot find symbol
  import com.ralmeida.txc2.web.ws.dto.BigDecimalDTO;
                                     ^
    symbol:   class BigDecimalDTO
    location: package com.ralmeida.txc2.web.ws.dto
  /home/ralmeida/development/txc2/web/build/openapi/server/src/gen/java/com/ralmeida/txc2/web/ws/dto/BankAccountDTO.java:21: error: cannot find symbol
    private BigDecimalDTO balance;
            ^

What arguments am I missing? Or could it be a bug?

Reproduce the jaxrs-spec generation from the shown YAML and Gradle/Npx arguments, focusing on --model-name-suffix, --type-mappings, --import-mappings, and --language-specific-primitives. Inspect the generated BankAccountDTO.java and compilation output; done means the balance field uses java.math.BigDecimal, imports the JDK type, and no BigDecimalDTO is generated or referenced.