小贝子编程

龙目岛不是在 maven 中编译的



我正在尝试通过 maven 编译使用龙目岛的项目，但遇到以下问题：

[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:devprojectsAkkaakka-testingakka-calculatorakka-calculator-libtarget
[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:devprojectsAkkaakka-testingakka-calculatorakka-calculator-libtargetclasses
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorliboperationmultiplyMultiplyResult.java:[13,22] error: variable firstNumber not initialized in the default constructor
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorliboperationmultiplyMultiplyResult.java:[14,22] error: variable secondNumber not initialized in the default constructor
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorliboperationmultiplyMultiplyResult.java:[15,22] error: variable result not initialized in the default constructor
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[35,52] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[35,87] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[36,54] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[37,74] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[38,74] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[38,101] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[43,50] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[43,85] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[44,64] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[45,84] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[46,84] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[46,111] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[51,50] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[51,85] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[52,64] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[53,84] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[54,84] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[54,111] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[59,50] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[59,85] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[60,60] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[61,80] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.java:[62,89] error: cannot find symbol
[ERROR] devprojectsAkkaakka-testingakka-calculatorakka-calculator-libsrcmainjavacommangusbrotherakkacalculatorlibCalculatorActor.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] ------------------------------------------------------------------------

其中第一个错误类型是此类中的字段：

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从龙目岛类访问getter时

我的maven pom.xml里面有以下内容：

<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>

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>
我不知道

为什么，但由于 maven-compiler-plugin，您遇到了编译器错误。如果可以，请将插件版本更改为 3.5 并检查它是否可以工作。

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>

Maven 编译器插件版本 3.8.1 在这里很重要，因为旧版本对我不起作用。

在模块信息中.java

 requires static lombok;
我为此

苦苦挣扎，并得出结论，龙目岛 1.16+ 和 Java 8 是早期版本的 Maven 编译器插件的问题。IDEA 2017.1 正在构建没有错误的代码，但 Maven 在公共方法上抛出"找不到符号"错误，这些错误肯定存在于反编译的 jar 文件中。

通过在我的项目及其库中升级到 maven-compiler-plugin 3.6.1，我能够解决这个问题，而不必走 Delombok 路径，这是我真正想避免的。

首先，您应该将 lombok 源代码(java 用 lombok 注释(添加到src/main/lombok中，并将 lombok-maven-plugin 添加到您的项目中，如下所示：

<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>

如果你不喜欢使用lombok-maven-plugin，你需要添加以下内容：

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

如果你真的想把你的龙头源放到src/main/java而不是默认的/src/main/lombok你必须这样做，这是不推荐的：

<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>

尽管OP的问题似乎已解决，但这些症状也可能由以下原因引起：

如果 Lombok 在您的 IDE 中工作，但表现得像它没有在 Maven 构建中生成任何方法等，原因可能是 Maven 已被设置为使用与 javac 编译器不同的编译器，这可能有不同的指令。

例如，如果您的 POM(或父 POM(包含以下内容：

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

在这种情况下，正在使用 eclipse 编译器，这个编译器对龙目岛不那么友好，并且有特殊的说明。

[对于我的情况，构建过程太变形了，因此我们决定不使用龙目岛，可悲的是]

您还需要检查 path 中的 java 版本。我的问题是Java 1.8和3.5版本。为了让它正常工作，我不得不切换到 1.7 和 3.5 .请注意，我们仍在 1.7

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" .

专家编译器插件

<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>

弹簧引导插件

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

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