Swagger jaxrs. How to generate single enum reference for all data objects - kotlin

Question

I use kotlin + Jersey and swagger documentation generator with the approach code first.
I have two DTO
enum class DataType {
FIRST, SECOND;
}
data class Data1(type: DataType)
data class Data2(type: DataType)
gradle dependency
implementation("io.swagger.core.v3:swagger-jaxrs2-jakarta:2.2.6")
Expected result for documentation:
components:
schemas:
DataType:
type: string
enum: [ FIRST, SECOND ]
Data1:
type: object
properties:
type:
$ref: '#/components/schemas/DataType'
Data2:
type: object
properties:
type:
$ref: '#/components/schemas/DataType'
Actual result
components:
schemas:
Data1:
type: object
properties:
type:
type: string
enum: [ FIRST, SECOND ]
Data2:
type: object
properties:
type:
type: string
enum: [ FIRST, SECOND ]
The problem is, that if any client reuses schema to generate classes for his own app, he gets two separate enum classes for the type property.
Q: How to make generator to detect that it is the same enum and extract it to separate type reference?

Answer 1

Ok, I found one approach myself
import io.swagger.v3.core.jackson.ModelResolver.SET_PROPERTY_OF_ENUMS_AS_REF
init {
System.setProperty(SET_PROPERTY_OF_ENUMS_AS_REF, "any value")
}
The other way is to implement a custom ModelResolver, but the class implementation looks quite complicated
UDPATE
Just noticed, that public static boolean enumsAsRef = System.getProperty("enums-as-ref") != null; in ModelResolver is not final. So we can do even simpler
init {
io.swagger.v3.core.jackson.ModelResolver.enumsAsRef = true
}