Kotlin Spring Boot Annotation Processing "Cannot Resolve Configuration Processing" - spring-boot

Question

I am unable to properly inject an #Value application property in my Kotlin Spring Boot application. The property as defined in my application.yml file, and subsequently referenced in an additional-spring-configuration-metadata.json file (under resources -> META-INF), is not properly being added to the bean expression context. Using IntelliJ version 2020.2.1, when I hover over the property, I see a Cannot resolve configuration property error. Attempting to run the application (with the configuration property value construction-injected into a class) leads to a Unsatisfied dependency expressed through constructor parameter error.
build.gradle.kts
plugins {
id("org.springframework.boot") version "2.3.3.RELEASE"
id("io.spring.dependency-management") version "1.0.10.RELEASE"
kotlin("jvm") version "1.3.72"
kotlin("plugin.spring") version "1.3.72"
}
group = "com.myProject"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11
repositories {
mavenCentral()
}
extra["springCloudVersion"] = "Hoxton.SR8"
dependencies {
implementation("org.springframework.boot:spring-boot-starter-webflux")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
implementation("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")
implementation("org.jetbrains.kotlin:kotlin-reflect")
implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
testImplementation("org.springframework.boot:spring-boot-starter-test") {
exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
}
testImplementation("io.projectreactor:reactor-test")
}
buildscript {
repositories {
mavenCentral()
jcenter()
}
dependencies {
classpath("com.google.cloud.tools:appengine-gradle-plugin:2.2.0")
}
}
apply(plugin = "com.google.cloud.tools.appengine")
configure<com.google.cloud.tools.gradle.appengine.appyaml.AppEngineAppYamlExtension> {
deploy {
projectId = "my-cloud-project"
version = "GCLOUD_CONFIG"
}
}
dependencyManagement {
imports {
mavenBom("org.springframework.cloud:spring-cloud-dependencies:${property("springCloudVersion")}")
}
}
tasks.withType<Test> {
useJUnitPlatform()
}
tasks.withType<KotlinCompile> {
kotlinOptions {
freeCompilerArgs = listOf("-Xjsr305=strict")
jvmTarget = "11"
}
}
Error Message
Spring error modal
additional-spring-configuration-metadata.json
{
"properties": [
{
"name": "otherApi.baseUrl",
"type": "java.lang.String",
"description": "Description for otherApi.baseUrl."
}
]
}
I've added annotation processing dependencies, invalidated caches and restarted, and played around with Kotlin specific annotation processors (kapt). I've also followed the instructions here: https://www.jetbrains.com/help/idea/annotation-processors-support.html
What am I missing? Any and all help would be appreciated. Thanks!

Answer 1

you need to declare the below as as annoatationProcessor
implementation("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")
to
annotationProcessor("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")

Answer 2

If your application.yml (or application.properties) looks like this:
spring:
datasource:
username: postgres
password: postgres
url: jdbc:postgresql://localhost:5433/company
driver-class-name: org.postgresql.Driver
then try to rewrite each property to full-name format for every property:
spring.datasource.username: postgres
spring.datasource.password: postgres
spring.datasource.url: jdbc:postgresql://localhost:5433/company
spring.datasource.driver-class-name: org.postgresql.Driver