How to use "Functional bean definition Kotlin DSL" with Spring Boot and Spring WebFlux?
Spring Boot is based on Java Config, but should allow experimental support of user-defined functional bean declaration DSL via ApplicationContextInitializer
support as described here.
In practice, you should be able to declare your beans for example in a Beans.kt
file containing a beans()
function.
fun beans() = beans {
// Define your bean with Kotlin DSL here
}
Then in order to make it taken in account by Boot when running main()
and tests, create an ApplicationContextInitializer
class as following:
class BeansInitializer : ApplicationContextInitializer<GenericApplicationContext> {
override fun initialize(context: GenericApplicationContext) =
beans().initialize(context)
}
And ultimately, declare this initializer in your application.properties
file:
context.initializer.classes=com.example.BeansInitializer
You will find a full example here and can also follow this issue about dedicated Spring Boot support for functional bean registration.
Another way to do it in Spring Boot would be :
fun main(args: Array<String>) {
runApplication<DemoApplication>(*args) {
addInitializers(
beans {
// Define your bean with Kotlin DSL here
}
)
}
}
You can define your beans in *Config.kt file and implement initalize method of ApplicationContextInitializer interface.
override fun initialize(applicationContext: GenericApplicationContext) {
....
}
Some bean definition here.
bean<XServiceImpl>("xService")
bean("beanName") {
BeanConstructor(ref("refBeanName"))
}