一、环境：
Eclipse version:2021-06. ( lasted version)
lombok version:1.18.20 ( lasted version)
m2e-apt:1.5.3 ( lasted version)
二、安装好m2e-apt plugin 好，进行配置
三、pom配置：
<properties>
<!-- automatically run annotation processors within the incremental compilation -->
<m2e.apt.activation>jdt_apt</m2e.apt.activation>
</properties>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-jdk8</artifactId>
<version>${mapstruct.version}</version>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${mapstruct.version}</version>
</dependency>
不建议有
<!-- <plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${mapstruct.version}</version>
</path>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</path>
</annotationProcessorPaths>
</configuration>
</plugin> -->
参考链接：
https://github.com/mapstruct/mapstruct/issues/2527
解决ClassNotFoundException: Cannot find implementation for xxx?（环境：Mapstruct、Lombok、Maven 和 Eclipse）
原文：https://www.cnblogs.com/stevenlii/p/15065009.html