Mapstruct not generating implementations with Maven and Kotlin

Question

as you've read in the title, I have a problem using Mapstruct with Kotlin and Maven.

(FYI: The solutions in this post didn't resolve the issue for me).

Following mapstruct-examples/mapstruct-kotlin, I've added the kapt plugin alongside the dependency to my project-roots <pluginManagement>:

<!-- Cut out non-kapt executions -->
<execution>
    <id>kapt</id>
    <goals>
        <goal>kapt</goal>
    </goals>

    <configuration>
        <sourceDirs>
            <sourceDir>src/main/kotlin</sourceDir>
            <sourceDir>src/main/java</sourceDir>
        </sourceDirs>
        <annotationProcessorPaths>
            <annotationProcessorPath>
                <groupId>org.mapstruct</groupId>
                <artifactId>mapstruct-processor</artifactId>
                <version>${org.mapstruct.version}</version> <!-- :1.5.5.Final -->
            </annotationProcessorPath>
        </annotationProcessorPaths>
    </configuration>
</execution>

Then I use it in each sub module like so:

<!-- Cut out unnecessary stuff again -->
<plugin>
    <groupId>org.jetbrains.kotlin</groupId>
    <artifactId>kotlin-maven-plugin</artifactId>
</plugin>

Just in case it helps clearing some questions, here's the Mapper:

@Mapper
interface CustomMapper {

    fun toDTO(entity: Entity): DTO

    fun toEntity(dto: DTO): Entity
}

Z-100 · Accepted Answer · 2023-10-31 15:17:30Z

1

The solution to my problem was rather easy to pull off and had an even dumber source to begin with.

The app I used Mapstruct in was a multi module project. Two of these modules depended on each other => Thus there was a cyclic dependency.

I refactored the modules to not be dependent on one and each other and that seemed to solve the issue.

answered Oct 31, 2023 at 15:17

Z-100

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