MapStruct与Lombok不能协同工作

Question

正在使用的技术堆栈：

Java 8 MapStruct:1.2.0.最终Lombok:1.16.18 IDE：IntelliJ-Lombok插件已安装

• 最初，当我删除getter和setter并添加@getter和@setter注释时，遇到了一些问题，Mapstruct无法找到该属性，并显示:结果类型com.vg.once.dto.OneDto中的未知属性“id”。您是说“空”吗？
• 我了解到Lombok 1.16.14或更新版本与MapStruct 1.2.0.beta1或更新版本是兼容的，并且可以协同工作，但我的版本比所需的版本要新，仍然会出现问题。
• 我已经尝试过的另一个解决方案是运行Lombok的Delombok插件，但仍然出现了同样的问题。

以下是项目文件：

实体对象：One.java：

import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class One {

    private int id;
    private Integer version;
    private int projectId;
    private String title;
    private String code;
    private int sortOrder;

}

DTO对象：OnedTo.java：

import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class OneDto {

    private int id;
    private Integer version;
    private int projectId;
    private String title;
    private String code;
    private int sortOrder;

}

映射器类：OneMapper.java

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;

import com.vg.once.dto.OneDto;
import com.vg.once.entity.One;

@Mapper
public interface OneMapper {

    @Mapping(target="id", source="one.id")
    OneDto createOne (One one);

}

pom.xml

<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.vg</groupId>
  <artifactId>mapstruct</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>Mapstruct-test</name>

    <properties>
        <java.version>1.8</java.version>
        <org.mapstruct.version>1.2.0.Final</org.mapstruct.version>
        <org.projectlombok.version>1.16.18</org.projectlombok.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${org.projectlombok.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-jdk8</artifactId>
            <version>${org.mapstruct.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins> 
         <plugin>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok-maven-plugin</artifactId>
                <version>1.16.18.1</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>delombok</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <sourceDirectory>src/main/java</sourceDirectory>
                    <addOutputDirectory>false</addOutputDirectory>
                    <outputDirectory>${project.build.directory}/delombok</outputDirectory>
                    <encoding>UTF-8</encoding>
                    <skip>false</skip>
                    <verbose>false</verbose>
                </configuration>
            </plugin>       
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.mapstruct</groupId>
                            <artifactId>mapstruct-processor</artifactId>
                            <version>${org.mapstruct.version}</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
        </plugins>
    </build>  
</project>

生成跟踪：

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Mapstruct-test 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- lombok-maven-plugin:1.16.18.1:delombok (default) @ mapstruct ---
[INFO] Delombok complete.
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ mapstruct ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ mapstruct ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 5 source files to /home/vivekgupta/Documents/workspaces/mapstruct-test/mapstruct/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/vivekgupta/Documents/workspaces/mapstruct-test/mapstruct/src/main/java/com/vg/once/mapper/OneMapper.java:[12,9] Unknown property "id" in result type com.vg.once.dto.OneDto. Did you mean "null"?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.637 s
[INFO] Finished at: 2017-12-06T19:23:53+05:30
[INFO] Final Memory: 19M/235M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile (default-compile) on project mapstruct: Compilation failure
[ERROR] /home/vivekgupta/Documents/workspaces/mapstruct-test/mapstruct/src/main/java/com/vg/once/mapper/OneMapper.java:[12,9] Unknown property "id" in result type com.vg.once.dto.OneDto. Did you mean "null"?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

请分享我如何使用Lombok和MapStruct一起工作？

Answer 1

它不起作用的原因是因为Maven只使用MapStruct处理器而不使用Lombok处理器。AnnotationProcessorPaths告诉maven应该使用哪些处理器。

delombok什么也不做，因为每个类最终只有2个文件，我认为maven编译器看不到它们。

您有两个选项：

选项1：在AnnotationProcessorPaths中添加lombok依赖项

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.6.1</version>
    <configuration>
        <source>${java.version}</source>
        <target>${java.version}</target>
        <annotationProcessorPaths>
            <path>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${org.projectlombok.version}</version>
            </path>
            <!-- This is needed when using Lombok 1.18.16 and above -->
            <path>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok-mapstruct-binding</artifactId>
                <version>0.2.0</version>
            </path>
            <!-- Mapstruct should follow the lombok path(s) -->
            <path>
                <groupId>org.mapstruct</groupId>
                <artifactId>mapstruct-processor</artifactId>
                <version>${org.mapstruct.version}</version>
            </path>
        </annotationProcessorPaths>
    </configuration>
</plugin>

备选方案2：

向依赖项中添加mapstruct-processor依赖项，并删除annotationprocessorpaths。这样，maven编译器就会获得依赖项中的所有注释处理器。

我建议使用选项1，这样您就可以确定您没有在代码中使用一些mapstruct可传递依赖项和内部类。

编辑：

为了确保IntelliJ注释处理也能工作，您必须添加mapstruct-processor作为IDEA-150621提供的依赖项。IntelliJ目前没有使用Maven的AnnotationProcessorPaths来正确配置项目。

编辑2：

添加有关Lombok 1.18.16所需的lombok-mapstruct-binding的信息和注释。