MapStruct not injected in Kotlin project - spring

Question

I am trying to create a project with current Kotlin, MapStruct and Java using Spring-Boot folowing some online examples, as I am new to MapStruct, however I am not able to inject the mapper into my service. Both Idea and Gradle (in build task test) complain that no bean has been found (UnsatisfiedDependencyException). Googling didn't help. What am I missing?
MWE:
build.gradle.kts
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
plugins {
id("org.springframework.boot") version "2.7.4"
id("io.spring.dependency-management") version "1.0.14.RELEASE"
kotlin("jvm") version "1.7.20"
kotlin("plugin.spring") version "1.7.20"
kotlin("plugin.jpa") version "1.7.20"
}
group = "com.example"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_17
configurations {
compileOnly {
extendsFrom(configurations.annotationProcessor.get())
}
}
repositories {
mavenCentral()
}
dependencies {
implementation("org.springframework.boot:spring-boot-starter-data-jpa")
implementation("org.springframework.boot:spring-boot-starter-web")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("org.jetbrains.kotlin:kotlin-reflect")
implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
annotationProcessor("org.springframework.boot:spring-boot-configuration-processor")
testImplementation("org.springframework.boot:spring-boot-starter-test")
implementation("org.mapstruct:mapstruct:1.5.3.Final")
annotationProcessor("org.mapstruct:mapstruct-processor:1.5.3.Final")
}
tasks.withType<KotlinCompile> {
kotlinOptions {
freeCompilerArgs = listOf("-Xjsr305=strict")
jvmTarget = "17"
}
}
tasks.withType<Test> {
useJUnitPlatform()
}
DemoAppllication.kt
package com.example.demo
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
#SpringBootApplication
class DemoApplication
fun main(args: Array<String>) {
runApplication<DemoApplication>(*args)
}
App.kt
package com.example.demo
import org.mapstruct.Mapper
import org.springframework.data.jpa.repository.JpaRepository
import org.springframework.stereotype.Repository
import org.springframework.stereotype.Service
import javax.persistence.*
#Entity
#Table(name = "items")
class Item(#Id var id: Int = 0)
data class ItemDto(val id: Int)
#Repository
interface ItemRepo : JpaRepository<Item, Int>
#Mapper(componentModel = "spring")
interface ItemMapper {
fun entToDto(item: Item) : ItemDto
fun entsToDtos(items: List<Item>) : List<ItemDto>
fun dtoToEnt(itemDto: ItemDto) : Item
}
#Service
class Srvc(private val itemMapper: ItemMapper, // XXX: no bean found for this one
private val repo: ItemRepo)
{
fun items() = itemMapper.entsToDtos(repo.findAll())
}
// controller skipped

Answer 1

Kapt is in maintenance mode! See example: https://github.com/mapstruct/mapstruct-examples/tree/main/mapstruct-kotlin
plugin {
// ...
kotlin("kapt")
// ...
}
dependencies {
// ...
kapt("org.mapstruct:mapstruct-processor:$version")
implementation("org.mapstruct:mapstruct:$version")
// ...
}
EDIT (by mpts.cz — for future me or anyone as new to Mapstruct and/or Gradle as I am):
use plugin kotlin("kapt")
replace annotationProcessor("org.mapstruct:mapstruct-processor:$version")
with kapt("org.mapstruct:mapstruct-processor:$version")
put the previous line before implementation("org.mapstruct:mapstruct:$version")
With these changes all seems to work smoothly. Thanks Numichi!