MapStruct is not generating implementation classes

Question

I am using Mapstruct and Lombok with maven and IDEA and it is refusing to generate mappers implementation. Config:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
...

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
        <java.version>11</java.version>
        <org.mapstruct.version>1.3.0.Beta2</org.mapstruct.version>
        <lombok.version>1.18.2</lombok.version>
    </properties>

    <dependencies>
        <!-- spring deps -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        ...

        <!-- lombok dep -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>

        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct</artifactId>
            <version>${org.mapstruct.version}</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>add-source</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>add-source</goal>
                        </goals>
                        <configuration>
                            <sources>
                                <source>${project.build.directory}/generated-sources/java/</source>
                                <source>${project.build.directory}/generated-sources/annotations/</source>
                            </sources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <release>11</release>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok.version}</version>
                        </path>
                        <path>
                            <groupId>org.mapstruct</groupId>
                            <artifactId>mapstruct-processor</artifactId>
                            <version>${org.mapstruct.version}</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.0.2</version>
                <configuration>
                    <archive>
                        <manifestEntries>
                            <Implementation-Version>${project.version}</Implementation-Version>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

   ...
</project>

Both Mapstruct and Lombok are registered as annotations processors with idea:

Implementation files does not generate when I try to build with IDEA or if I try maven clean install.

I have tried changing Java from 11 to 8 and it still does not work. /target/generated-sources/annotations is just empty. Other project with same config is wroking fine.

Does it work when you run it only with maven? Which version of IntelliJ are you using? — Filip
– Filip, Commented Jan 31, 2019 at 18:44
could it be that build-helper-maven-plugin conflicts with generating resources? Could you comment that one out and see what happens? — Sjaak
– Sjaak, Commented Jan 31, 2019 at 19:13

Ankit Chauhan · Accepted Answer · 2020-08-28 11:47:38Z

13

Adding mapstruct-processor dependency solved the issue for me.

answered Aug 28, 2020 at 11:47

Ankit Chauhan

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1 Comment

Akash Verma Over a year ago

Adding the gradle dependency which worked for me. implementation 'org.mapstruct:mapstruct-processor:1.0.0.Beta3' Note - Its terrible that I can’t format comment in stackoverflow

user3495816 · Accepted Answer · 2019-02-01 09:14:21Z

7

Problem was that my mappers were missing annotation @Mapper.

answered Feb 1, 2019 at 9:14

user3495816

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Comments

anstue · Accepted Answer · 2021-04-29 12:17:54Z

7

If you use kotlin, you need to use kapt instead of annotationProcessor

Gradle example:

plugins {
  kotlin("kapt") version "1.4.32"
}
...
dependencies {
  ...
  implementation("org.mapstruct:mapstruct:1.4.2.Final")
  kapt("org.mapstruct:mapstruct-processor:1.4.2.Final")
}

Afterwards the implementation is generated if you execute gradle build

answered Apr 29, 2021 at 12:17

anstue

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2 Comments

Akash Verma Over a year ago

adding kotlin("kapt") version "1.4.32" in plugins {} block results in error saying "only id(String) method calls allowed in plugins {} script block"

Urma Over a year ago

OMG thank you for this comment. I spent to much time to fix it. If you using gradle and kotlin plugins { id "org.jetbrains.kotlin.kapt" version '' } dependencies { kapt 'org.mapstruct:mapstruct-processor:'}

Mattia Casella · Accepted Answer · 2021-10-21 12:02:32Z

2

For me the problem was:

<useIncrementalCompilation>false</useIncrementalCompilation>

After commented that out, all works!

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
    <configuration>
        <source>${jdk.target.version}</source>
        <target>${jdk.target.version}</target>
        <!--<useIncrementalCompilation>false</useIncrementalCompilation>-->
        <annotationProcessorPaths>
            <path>
                <groupId>org.mapstruct</groupId>
                <artifactId>mapstruct-processor</artifactId>
                <version>${org.mapstruct.version}</version>
            </path>
        </annotationProcessorPaths>
    </configuration>
</plugin>

answered Oct 21, 2021 at 12:02

Mattia Casella

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3 Comments

J.Wincewicz Over a year ago

Mattia, this does not look like an answer for OP question. As you can see useIncrementalCompilation was not used.

Mattia Casella Over a year ago

You are right! I just wanted to share my solution in case someone has the same kind of problem as me. I think it might be useful for some people.

SamwellTarly Over a year ago

@MattiaCasella I'm glad you left this here. It is a solution to the problem why Mapstruct was not generating the implementation class for the Mapper. The solution as shown in your answer was to add it to the annotation processor path

DeveloperKurt · Accepted Answer · 2021-11-28 11:00:46Z

If you are using Kotlin with maven, you can add these dependencies:

    <dependency>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct</artifactId>
        <version>1.4.2.Final</version>
    </dependency>

    <dependency>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct-processor</artifactId>
        <version>1.4.2.Final</version>
    </dependency>

And add the kapt execution to the kotlin-maven-plugin as follows:

   <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>1.5.0</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>2.9</version>
                                </annotationProcessorPath>
                            </annotationProcessorPaths>
                        </configuration>
                    </execution>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>test-compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

DH12 · Accepted Answer · 2023-05-20 23:45:00Z

1

Try Properties > Maven > Annotation Processing > (Enable) Automatically configure JDT APT.

answered May 20, 2023 at 23:45

DH12

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Comments

marc_s · Accepted Answer · 2021-03-14 11:05:48Z

0

I have come across this issue. In my case gets this error:

Java: No implementation was created for Mapper due to having a problem in the erroneous element

when the app is running.

I used to spring boot version 2.4.3 when I decrease version to 2.2.6.RELEASE it start to work

edited Mar 14, 2021 at 11:05

marc_s

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answered Mar 10, 2021 at 13:29

Ulug'bek

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Comments

Xparsh · Accepted Answer · 2024-12-21 06:33:14Z

0

I've tried everything here but nothing worked so I copied the pom.xml which is actually working there I found that we have to add this configuration after build tag. Then compile and it will generate Mapper Impl class in target folder

<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
        </repository>
</repositories>

answered Dec 21, 2024 at 6:33

Xparsh

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