kotlin, spring boot and data classes for configuration

I've implemented several projects with spring boot and java. Now I'm evaluating, if I could do it with kotlin.

I am struggling with @ConfigurationProperties and data classes.

Simple example:

api:
  clientId: client123
  url: https://api.url.com
  key: api-access-key

Data class:

@ConfigurationProperties("api")
@ConstructorBinding
data class ApiConfiguration(
    val clientId: String,
    val url: String,
    val key: String
)

Starter class:

@EnableConfigurationProperties(ApiConfiguration::class)
@SpringBootApplication
class SpringdemoApplication

fun main(args: Array<String>) {
    runApplication<SpringdemoApplication>(*args)
}

If I'm running a test, I get the following message:

s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'apiConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

...


Description:

ApiConfiguration is annotated with @ConstructorBinding but it is defined as a regular bean which caused dependency injection to fail.

Action:

Update your configuration so that ApiConfiguration is defined via @ConfigurationPropertiesScan or @EnableConfigurationProperties.

The following post doesn't help me: Kotlin & Spring Boot @ConfigurationProperties

Environment:

• spring boot 2.7.8
• kotlin 1.6.21

Can someone help me to understand and solve the problem?