Spring Boot Kotlin - Injecting a map from a YAML file - spring-boot

Question

test.yml (location: resources/properties/)
edit:
field1: test
field2: test
field3: test
field4: test
PropertyConfig.kt
#Configuration
#PropertySource("classpath:properties/test.yml")
class PropertyConfig {
#Bean
#ConfigurationProperties(prefix = "edit")
fun testProperty() = mutableMapOf<String, String>()
}
#Service
class EditService(
private val testProperty: Map<String, String>
) {
fun print() {
println(testProperty) // empty
}
}
I want to receive the values below edit as a map.
I tried options for #ConfigurationProperties with prefix and value, but it doesn't work.
If I use properties file, it works well, but not yml file.
What am I missing? Thanks.
kotlinVersion = '1.6'; springBootVersion = '2.6.1'

Answer 1

You are missing the #ContructorBinding annotation (required as of Spring Boot 2.2.0). Please see this answer:
#ConstructorBinding
#ConfigurationProperties("")
data class PropertyConfig(
val edit: Map<String,String>
)
If you wanna use a non-standard yml file (not called application.yml or derivate), like in the example you provided, then you need to add also the #PropertySource annotation to your Configuration data class.
#ConstructorBinding
#ConfigurationProperties("")
#PropertySource(value = "classpath:test.yml")
data class PropertyConfig(
val edit: Map<String,String>
)

Answer 2

Something like this (without #Bean):
#ConfigurationProperties(prefix = "") // blank since "edit:" is root element
#ConstructorBinding
data class EditProperties(
val edit: Map<String, String> // property name must match to relevant root element in YAML
)
#Service
class EditService(private val properties: EditProperties) {
fun print() {
println(properties.edit)
}
}
Output:
{field1=test, field2=test, field3=test, field4=test}