kapt is not working even manually in IntelliJ with Maven

Question

https://github.com/mapstruct/mapstruct-examples/tree/master/mapstruct-kotlin

I run above kotlin mapstruct project with maven but it emits below error.

Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: Cannot find implementation for org.mapstruct.example.kotlin.converter.PersonConverter
    at org.mapstruct.factory.Mappers.getMapper(Mappers.java:61)
    at org.mapstruct.example.kotlin.MainKt.main(Main.kt:10)
Caused by: java.lang.ClassNotFoundException: Cannot find implementation for org.mapstruct.example.kotlin.converter.PersonConverter
    at org.mapstruct.factory.Mappers.getMapper(Mappers.java:75)
    at org.mapstruct.factory.Mappers.getMapper(Mappers.java:58)
    ... 1 more

It seems annotation processor is not working even I enabled annotation processing in the Settings.

https://kotlinlang.org/docs/kapt.html#using-in-cli The Official kotlin document says:

Please note that kapt is still not supported for IntelliJ IDEA’s own build system. Launch the build from the “Maven Projects” toolbar whenever you want to re-run the annotation processing.

(related issue: https://youtrack.jetbrains.com/issue/KT-15040)

So I tried to conduct kapt manually.

However the output folders are still empty.

What's wrong with me? I was able to do annotation processing in Java with Maven before. Thanks in advance.

score 1 · Accepted Answer · answered Mar 27 '21 at 06:50

1

I found the answer.

Just push compile button in Maven project or mvn compile in command before running your application whenever you need the annotation processing.

answered Mar 27 '21 at 06:50

mazend

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Sergey · Answer 2 · 2022-10-13T15:30:45.860

This is an excerpt from my answer to similar question: You can configure pom.xml build file like this:

<dependencies>
    <dependency>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-stdlib</artifactId>
        <version>1.7.20</version>
    </dependency>
    <dependency>
        <groupId>com.google.dagger</groupId>
        <artifactId>dagger</artifactId>
        <version>2.22</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-plugin</artifactId>
            <version>${kotlin.version}</version>
            <executions>
                <execution>
                    <id>kapt</id>
                    <goals>
                        <goal>kapt</goal>
                    </goals>
                    <configuration>
                        <sourceDirs>
                            <sourceDir>src/main/kotlin</sourceDir>
                            <sourceDir>src/main/java</sourceDir>
                        </sourceDirs>
                        <annotationProcessorPaths>
                            <!-- Specify your annotation processors here. -->
                            <annotationProcessorPath>
                                <groupId>com.google.dagger</groupId>
                                <artifactId>dagger-compiler</artifactId>
                                <version>2.22</version>
                            </annotationProcessorPath>
                        </annotationProcessorPaths>
                    </configuration>
                </execution>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                    <configuration>
                        <sourceDirs>
                            <sourceDir>src/main/kotlin</sourceDir>
                            <sourceDir>src/main/java</sourceDir>
                        </sourceDirs>
                    </configuration>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>test-compile</goal>
                    </goals>
                    <configuration>
                        <sourceDirs>
                            <sourceDir>src/test/kotlin</sourceDir>
                            <sourceDir>src/test/java</sourceDir>
                        </sourceDirs>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>11</source>
                <target>11</target>
            </configuration>
            <executions>
                <execution>
                    <id>default-compile</id>
                    <phase>none</phase>
                </execution>
                <execution>
                    <id>default-testCompile</id>
                    <phase>none</phase>
                </execution>
                <execution>
                    <id>java-compile</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                </execution>
                <execution>
                    <id>java-test-compile</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

These are the links usefull to read when you want to create maven project with java, kotlin and dagger:

kapt is not working even manually in IntelliJ with Maven

2 Answers2