I'm trying to use spring-boot's configuration meta...

# spring

[Czar]

I'm trying to use spring-boot's configuration meta-data with spring boot 2.1.6 and kotlin:
build.gradle.kts

plugins {
	id("org.springframework.boot") version "2.1.6.RELEASE"
	id("io.spring.dependency-management") version "1.0.7.RELEASE"
	val kotlinVersion = "1.3.41"
	kotlin("jvm") version kotlinVersion
	kotlin("plugin.spring") version kotlinVersion
	kotlin("kapt") version kotlinVersion
}
dependencies {
	kapt("org.springframework.boot:spring-boot-configuration-processor")
	implementation(kotlin("reflect"))
	implementation(kotlin("stdlib-jdk8"))
	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
	//...
}

application.yml

security:
  csrfEnabled: true
  token.writer.secret: h2l89efhlwskiehf89o23fhnsldhf89023

usage of secret in a class:

@ConfigurationProperties(prefix = "security.token.writer")
class TokenBasedAuthenticationFilter {
	private lateinit var secret: String
	//...

There is no metadata or autocomplete and IntelliJ shows Cannot resolve configuration property 'security.token.writer.secret' warning
Am I missing something or is it a bug/limitation?

[Luis Munoz]

works for me

[Luis Munoz]

https://github.com/spring-projects/spring-boot/issues/8762

[Luis Munoz]

https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-kotlin.html

[Luis Munoz]

look at 50.5

[Czar]

Huh, maybe it's kotlin-reflect missing, I don't remember and the project is on my work laptop, I'll check it tomorrow. Thanks for the pointer.

[Czar]

Nope, I didn't forget kotlin-reflect, it's there. I also re-checked all the requirements in 50.1, all are satisfied. And 50.5 only asks to do what I already have shown in the snippets above. I'll edit and add relevant dependencies to the snippet, to avoid ambiguity.

[Czar]

Half the problems solved, turns out it is a limitation on the IntelliJ side, which doesn't see the bindings, until I compile the code, then all the bindings are visible. Now I have another problem, nested configurations do not work.

@ConfigurationProperties(prefix = "security")
class SecurityConfigurationParameters {
	var csrfEnabled: Boolean = true
	@NestedConfigurationProperty
	lateinit var token: Token

}

class Token {
	lateinit var privateSecret: String
	lateinit var publicSecret: String
}

I also tried making Token an inner class Token in the SecurityConfigurationProperties - to no avail. Error is always:

BindException: Failed to bind properties under 'security.token' to com.example.security.Token
IllegalStateException: Unable to get value for property token

[Czar]

It just doesn't work... To hell with it, normal immutable stuff is fully supported and works (see code below) on 2.2 M4, I'll use that. For the project I'm working on production isn't planned till October anyway 😃

@ConfigurationProperties(prefix = "security")
class SecurityConfigurationParameters(
	@DefaultValue("false")
	val csrfEnabled: Boolean,
	@NestedConfigurationProperty
	val token: TokenConfig
)

class TokenConfig(
	val privateSecret: String,
	val publicSecret: String
)