maven - 如何使用 Lombok 消除 Mavenized 项目 Intellij 中的重复类错误

Question

我有一个 Maven 管理的 Lombok 项目，我使用 Intellij。构建后，由于 target/generated-sources/delombok 中生成的源，我总是在 Intellij 中遇到很多关于重复类的错误。我可以做些什么来消除这些错误吗？现在我只是删除目标文件夹，但这确实很烦人。

我在 Maven 中有标准配置，Lombok 源代码在 src/main/lombok 中:

       <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
            </configuration>
        </plugin>

        <plugin>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok-maven-plugin</artifactId>
            <version>1.16.8.0</version>
            <executions>
                <execution>
                    <phase>generate-sources</phase>
                    <goals>
                        <goal>delombok</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

  <profiles>
    <profile>
        <id>lombok-needs-tools-jar</id>
        <activation>
            <file>
                <exists>${java.home}/../lib/tools.jar</exists>
            </file>
        </activation>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.projectlombok</groupId>
                    <artifactId>lombok-maven-plugin</artifactId>
                    <version>1.16.8.0</version>
                    <dependencies>
                        <dependency>
                            <groupId>sun.jdk</groupId>
                            <artifactId>tools</artifactId>
                            <version>1.8</version>
                            <scope>system</scope>
                            <systemPath>${java.home}/../lib/tools.jar</systemPath>
                        </dependency>
                    </dependencies>
                </plugin>
            </plugins>
        </build>
    </profile>
</profiles>

Answer 1

根据delombok goal documentation :默认输出目录是:

${project.build.directory}/generated-sources/delombok

我找到了 JetBrains 团队成员 comment声明:

IDEA automatically excludes the build 'target' folder, providing that there are no generated sources under it, otherwise it excludes all sub-folders but the generated.

If you have some generated code or build artifacts that you want being excluded, you may put it under the 'target' folder.

这意味着 /generated-sources默认情况下不排除目录，如果您打算排除某些文件，则应将它们放在父 /target 下目录而不是 /generated-sources 下.

要实现此目的，您应该配置插件并提供非默认 <outputDirectory> :

<plugin>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok-maven-plugin</artifactId>
    <version>1.16.18.0</version>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                <goal>delombok</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <sourceDirectory>src/main/java</sourceDirectory>
        <outputDirectory>${project.build.directory}/delombok</outputDirectory>
        <addOutputDirectory>false</addOutputDirectory>
        <encoding>UTF-8</encoding>
    </configuration>
</plugin>

这将阻止 IDEA 产生 Duplicate class found in (...)警告。