Spring Boot ConfigurationProperties metadata generation - wrong default values - spring-boot

Question

So I'm trying to generate my own configuration metadata from #ConfigurationProperties items, following documentation available at https://docs.spring.io/spring-boot/docs/current/reference/html/configuration-metadata.html#configuration-metadata-annotation-processor. Note that I'm using Spring Boot 2.0 and Kotlin.
It works fine, except for one thing: the defaultValue fields are not getting filled with my default values, but instead just contain standard values like 0 or false.
My #ConfigurationProperties file looks like this:
#Component
#ConfigurationProperties("flowr.epg")
class EpgProperties {
/** Whether or not schedules should be computed/refreshed on (re)start */
var refreshOnRestart = true
/** Number of threads used to store new images */
var nImagesUploadThreads = 10
}
The result looks like this:
{
"hints": [],
"groups": [
{
"sourceType": "com.taktik.flowr.epg.properties.EpgProperties",
"name": "flowr.epg",
"type": "com.taktik.flowr.epg.properties.EpgProperties"
}
],
"properties": [
{
"sourceType": "com.taktik.flowr.epg.properties.EpgProperties",
"defaultValue": false,
"name": "flowr.epg.refresh-on-restart",
"description": "Whether or not schedules should be computed\/refreshed on (re)start",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.taktik.flowr.epg.properties.EpgProperties",
"defaultValue": 0,
"name": "flowr.epg.n-images-upload-threads",
"description": "Number of threads used to store new images in Ozone",
"type": "java.lang.Integer"
}
}
The documentation is kind of poor about that defaultValue field. Am I doing something wrong? Is it possible to fill that defaultValue field automatically? If yes, what am I doing wrong?