执行mvn clean install抛出Lombok错误的原因及解决咨询

我在对项目执行mvn clean install命令，已安装最新版IntelliJ（2022.2），该版本自带Lombok插件，但执行命令时出现构建错误：

WARNING: Illegal reflective access by lombok.javac.apt.LombokProcessor to field com.sun.tools.javac.processing.JavacProcessingEnvironment.discoveredProcs
WARNING: Please consider reporting this to the maintainers of lombok.javac.apt.LombokProcessor
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.031 s
[INFO] Finished at: 2022-07-29T04:25:35-04:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile)

应要求附上完整pom.xml：

<?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>

    <groupId>com.visa.gis.shiftleft</groupId>
    <artifactId>service-registry-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>service-registry-server</name>
    <description>This is a cloud service to enable the micro services to register themselves and
        discover other services</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.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>
        <java.version>1.8</java.version>
        <spring-cloud.version>Dalston.SR3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

解答：不需要降级IntelliJ #

问题核心不在IntelliJ版本，而是Lombok和Maven编译器插件的兼容性问题：

• 当前项目依赖的Spring Boot 1.5.6.RELEASE管理的Lombok版本偏旧，和IntelliJ 2022.2配套的javac版本存在反射访问兼容性问题，导致编译时触发非法反射警告，进而失败。
• 同时你使用的maven-compiler-plugin 3.1版本也比较老，对新的javac兼容性不足。

解决步骤： #

1. 指定兼容的Lombok版本：在pom.xml的Lombok依赖中明确添加新版本，比如1.18.24（这个版本稳定适配Java 8）：

   <dependency>
       <groupId>org.projectlombok</groupId>
       <artifactId>lombok</artifactId>
       <scope>compile</scope>
       <version>1.18.24</version>
   </dependency>
   

2. 升级Maven编译器插件：在pom.xml的<build><plugins>块中添加或更新maven-compiler-plugin到3.8.1版本：

   <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-compiler-plugin</artifactId>
       <version>3.8.1</version>
       <configuration>
           <source>1.8</source>
           <target>1.8</target>
       </configuration>
   </plugin>
   

3. 确认IntelliJ配置：检查Settings > Build, Execution, Deployment > Compiler > Annotation Processors，确保Enable annotation processing已勾选，Lombok插件处于启用状态（IntelliJ 2022.2自带的插件默认是启用的，可确认下）。

执行完以上步骤后，重新运行mvn clean install即可完成构建。

内容的提问来源于stack exchange，提问作者Jonathan