Lombok在Maven中无法编译

Question

Lombok在Maven中无法编译

27

我正在尝试通过Maven编译使用lombok的项目，但是我遇到了以下问题：

[INFO] ------------------------------------------------------------------------
[INFO] Building akka-calculator-lib 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ akka-calculator-lib ---
[INFO] Deleting C:\dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ akka-calculator-lib ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ akka-calculator-lib ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 11 source files to C:\dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\operation\multiply\MultiplyResult.java:[13,22] error: variable firstNumber not initialized in the default constructor
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\operation\multiply\MultiplyResult.java:[14,22] error: variable secondNumber not initialized in the default constructor
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\operation\multiply\MultiplyResult.java:[15,22] error: variable result not initialized in the default constructor
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[35,52] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[35,87] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[36,54] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[37,74] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[38,74] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[38,101] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[43,50] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[43,85] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[44,64] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[45,84] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[46,84] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[46,111] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[51,50] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[51,85] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[52,64] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[53,84] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[54,84] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[54,111] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[59,50] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[59,85] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[60,60] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[61,80] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[62,89] error: cannot find symbol
[ERROR] \dev\projects\Akka\akka-testing\akka-calculator\akka-calculator-lib\src\main\java\com\mangusbrother\akka\calculator\lib\CalculatorActor.java:[62,127] error: cannot find symbol
[INFO] 27 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] akka-parent ........................................ SUCCESS [  0.164 s]
[INFO] akka-testing ....................................... SUCCESS [  0.011 s]
[INFO] akka-calculator .................................... SUCCESS [  0.010 s]
[INFO] akka-calculator-lib ................................ FAILURE [  2.758 s]
[INFO] akka-calculator-creation ........................... SKIPPED
[INFO] akka-calculator-lookup ............................. SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.120 s
[INFO] Finished at: 2016-02-14T19:01:21+01:00
[INFO] Final Memory: 14M/169M
[INFO] ------------------------------------------------------------------------

第一种错误类型是针对此类中的字段：

package com.mangusbrother.akka.calculator.lib.operation.multiply;


import com.mangusbrother.akka.calculator.lib.operation.MathematicalResult;
import lombok.Data;

/**
 * Created by Mangusbrother on 14/02/2016.
 */
@Data
public class MultiplyResult implements MathematicalResult {
    private static final long serialVersionUID = 738641818941986L;
    private final int firstNumber;
    private final int secondNumber;
    private final int result;
}

第二个错误是当一个类试图访问lombok类的getter时。

我的maven pom.xml中有以下内容：

<properties>
    <lombok.version>1.16.6</lombok.version>
</properties>
<dependencies>
   <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

- mangusbrother

源代码位于哪里？src/main/java，src/main/lombok？ - Tunaki

是的。尝试移动它们。 - Tunaki

2

你是怎么运行Maven的？出现了什么错误？你应该运行 mvn clean package。 - Tunaki

@Tunaki 不，不是！源代码在/src/main/java很好。 - Nagy Vilmos

我运行了 mvn clean install。mvn clean package 会给出相同的错误。 - mangusbrother

显示剩余10条评论

8个回答

19

我不知道为什么，但你因为maven-compiler-plugin而得到编译错误。如果可以，请将插件版本更改为3.5并检查是否有效。

- grzesiekw

1

这就是问题所在。升级到3.5.1版本的编译器插件并按照上述给定配置，将允许您使用lombok，而不必移动任何内容从src/main/java或添加额外的插件或继承外部父级。 - mangusbrother

2

我的maven-compiler-plugin版本是3.8.1，但我仍然遇到这个错误。 - Gurkirat Singh Guliani

8

我的工作配置如下。

在pom文件中：

     <properties>
        <java.version>14</java.version>
        <lombok-version>1.18.12</lombok-version>
    </properties>

     <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok-version}</version>            
            <optional>true</optional>
        </dependency>

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>14</source>
                    <target>14</target>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok-version}</version>
                        </path>
                    </annotationProcessorPaths>                 
                </configuration>
            </plugin>
        </plugins>
    </build>

对我来说，Maven编译器插件版本3.8.1在这里非常重要，因为旧版本对我无效。

在module-info.java文件中

 requires static lombok;

- Yuva

这个对我有用。在此之前，当检查生成的类文件时，lombok方法丢失了。 - Radu Ionescu

7

我曾经遇到过这个问题，最终得出结论：Lombok 1.16+和Java 8与较早版本的Maven编译器插件存在问题。IDEA 2017.1可以无错误构建代码，但是Maven在公共方法上抛出“符号未找到”的错误，而这些方法在反编译的jar文件中肯定存在。

通过将maven-compiler-plugin 3.6.1升级到整个项目及其库中，我成功解决了该问题，而不必走Delombok的路线，这正是我想要避免的。

- Daniel Seltzer

1

首先，您需要将 lombok源代码（使用lombok注解的java代码）放置在src/main/lombok目录下，并像以下方式一样将lombok-maven-plugin添加到项目中：

<build>
  <plugins>
    <plugin>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok-maven-plugin</artifactId>
      <version>1.16.6.1</version>
      <executions>
        <execution>
          <phase>generate-sources</phase>
          <goals>
            <goal>delombok</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

如果您不喜欢使用lombok-maven-plugin，您需要添加以下内容：

<dependencies>
  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.6</version>
    <scope>provided</scope>
  </dependency>
</dependencies>

如果你真的喜欢把你的Lombok源代码放在 src/main/java 而不是默认的 /src/main/lombok （这并不被推荐），那么你需要按照以下步骤进行：

<build>
  <sourceDirectory>target/generated-sources/delombok</sourceDirectory>
  <testSourceDirectory>target/generated-test-sources/delombok</testSourceDirectory>
  <plugin>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok-maven-plugin</artifactId>
    <version>1.16.6.1</version>
    <executions>
      <execution>
        <id>delombok</id>
        <phase>generate-sources</phase>
        <goals>
          <goal>delombok</goal>
        </goals>
        <configuration>
          <addOutputDirectory>false</addOutputDirectory>
          <sourceDirectory>src/main/java</sourceDirectory>
        </configuration>
      </execution>
      <execution>
        <id>test-delombok</id>
        <phase>generate-test-sources</phase>
        <goals>
          <goal>testDelombok</goal>
        </goals>
        <configuration>
          <addOutputDirectory>false</addOutputDirectory>
          <sourceDirectory>src/test/java</sourceDirectory>
        </configuration>
      </execution>
    </executions>
  </plugin>
</build>

- khmarbaise

如果您想生成去除Lombok的源代码，那么可以使用delombok插件，不是吗？我不需要扩展的源代码。我已经有了依赖项，但文件仍无法编译。 - mangusbrother

没有“delombok插件”。 - specializt

我不使用delombok插件，只是它的目标。请参见此处：http://awhitford.github.io/lombok.maven/lombok-maven-plugin/usage.html - khmarbaise

1

尽管OP的问题似乎已经解决，但这些症状也可能是由以下原因引起的：

如果Lombok在您的IDE中工作，但在Maven构建中表现得好像没有生成任何方法等，则其原因可能是Maven已被设置为使用不同于javac编译器的编译器，该编译器可能具有不同的指令。

例如，如果您的POM（或父级POM）包含类似于以下内容的内容：

    <pluginManagement>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <compilerId>eclipse</compilerId>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>

在这种情况下，使用的是Eclipse编译器，这个编译器对lombok不太友好，并且有特殊说明。

[对于我的情况来说，这使得构建过程变得非常复杂，因此我们决定不使用lombok，很遗憾。]

- Richard Tingle

0

您还需要检查路径中有哪个版本的Java。我的问题出在Java 1.8和3.5版本上。为了使其正常工作，我不得不切换到1.7和3.5。请注意，我们仍然使用1.7版本。

- user666

0

使用以下参数增加JVM的堆栈大小：-Xss10240m

MAVEN_OPTS

set MAVEN_OPTS=-Xss10240m" 或 export MAVEN_OPTS="-Xss10240m"。

_JAVA_OPTIONS

_JAVA_OPTIONS="-Xss10240m"。

maven-compiler-plugin

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
    <configuration>
        <compilerArgs>
            <arg>-Xss10240m</arg>
        </compilerArgs>
    </configuration>
</plugin>

spring-boot-maven-plugin

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <jvmArguments>
            -Xss10240m
        </jvmArguments>
    </configuration>
</plugin>

- Mahmoud

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Renato Garcia · Accepted Answer

将annotationProcessorPaths添加到您的maven-compiler-plugins配置中：

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>${maven-compiler-plugin.version}</version>
  <configuration>
    <annotationProcessorPaths>
      <path>
        <groupId>org.projectlombok</groupId>     
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
      </path>
    </annotationProcessorPaths>
  </configuration>
</plugin>