Maven 阴影插件未将类复制到 .jar 文件

Question

我已经下载 Gatling Maven Example 并尝试在其中添加 mvn shade 插件，如下所示，jar 已创建但不包含任何类，因此在执行过程中失败

E:\projects\gatling-maven>java -jar target\gatling-maven-plugin-demo-2.2.3.jar
Error: Could not find or load main class Engine

这里是pom.xml我加了

<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>io.gatling</groupId>
  <artifactId>gatling-maven-plugin-demo</artifactId>
  <version>2.2.3</version>

  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <gatling.version>${project.version}</gatling.version>
    <gatling-plugin.version>2.2.1</gatling-plugin.version>
    <scala-maven-plugin.version>3.2.2</scala-maven-plugin.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>io.gatling.highcharts</groupId>
      <artifactId>gatling-charts-highcharts</artifactId>
      <version>${gatling.version}</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>net.alchim31.maven</groupId>
        <artifactId>scala-maven-plugin</artifactId>
        <version>${scala-maven-plugin.version}</version>
      </plugin>
      <plugin>
        <groupId>io.gatling</groupId>
        <artifactId>gatling-maven-plugin</artifactId>
        <version>${gatling-plugin.version}</version>
        <executions>
          <execution>
            <goals>
              <goal>execute</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

       <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.3</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <mainClass>Engine</mainClass>
                </transformer>
              </transformers>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

包结构如

Answer 1

您必须将所有资源和 Scala 文件移动到 src\main\resources 和 src\main\scala。 Shade 插件不会包含您的测试资源和 scala 文件。我也试过 shadedTestjar 也没有用。另一种选择是您可以使用

Maven 依赖插件并手动移动所有依赖 - 容易出错且丑陋
使用 Assembly 插件 - 不合适

我试过在 src/main 中移动您的资源和 scala 文件，它成功了。以下是工作pom内容，

<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>io.gatling</groupId>
    <artifactId>gatling-maven-plugin-demo</artifactId>
    <version>2.2.3</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <gatling.version>${project.version}</gatling.version>
        <gatling-plugin.version>2.2.1</gatling-plugin.version>
        <scala-maven-plugin.version>3.2.2</scala-maven-plugin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>io.gatling.highcharts</groupId>
            <artifactId>gatling-charts-highcharts</artifactId>
            <version>${gatling.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>${scala-maven-plugin.version}</version>
            </plugin>
            <plugin>
                <groupId>io.gatling</groupId>
                <artifactId>gatling-maven-plugin</artifactId>
                <version>${gatling-plugin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>execute</goal>
                        </goals>
                        <configuration>
                            <configFolder>src/main/resources</configFolder>
                            <dataFolder>src/main/resources/data</dataFolder>
                            <resultsFolder>target/gatling/results</resultsFolder>
                            <requestBodiesFolder>src/main/resources/request-bodies</requestBodiesFolder>
                            <simulationsFolder>src/main/scala</simulationsFolder>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>Engine</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

希望它能解决您的问题。

更改以下插件配置后尝试，

    <plugin>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>${scala-maven-plugin.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

和

     <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.3</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>Engine</mainClass>
                            </transformer>
                        </transformers>
                        <filters>
                            <filter>
                                <artifact>*:*</artifact>
                                <excludes>
                                    <exclude>META-INF/*.SF</exclude>
                                    <exclude>META-INF/*.DSA</exclude>
                                    <exclude>META-INF/*.RSA</exclude>
                                </excludes>
                            </filter>
                        </filters>
                    </configuration>
                </execution>
            </executions>
        </plugin>

仍然存在文件未找到异常，但我相信它们很容易解决。

Answer 2

首先了解一下Maven标准目录结构约定。您的主要项目源现在放在 src/test/ 而不是正确的 src/main/ 下，因此它们被视为用于单元测试。所以就不打包了。

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