GCP 数据流快速入门错误 运行 WordCount 示例：未知的生命周期阶段“.mainClass=org.apache.beam.examples.WordCount”

Question

我正在尝试从此处 https://cloud.google.com/dataflow/docs/quickstarts/quickstart-java-maven 完成 GCP 云数据流的 "Quickstart Using Java"，但在 "Run WordCount locally" 步骤中遇到错误。

运行 这在 PowerShell 提示符下

PS C:\apache-maven-3.6.2\word-count-beam> mvn compile exec:java -Dexec.mainClass=org.apache.beam.examples.WordCount -Dexec.args="--output=.\output\"

我收到一条构建失败消息：

[ERROR] Unknown lifecycle phase ".mainClass=org.apache.beam.examples.WordCount". You must specify a valid lifecycle phase or a goal in the format : or :[:]:. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-clean, clean, post-clean, pre-site, site, post-site, site-deploy. -> [Help 1]

当我添加 -e 时，我还得到堆栈跟踪：

at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateLifecycleMappings (DefaultLifecycleExecutionPlanCalculator.java:248) at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateMojoExecutions (DefaultLifecycleExecutionPlanCalculator.java:217) at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan (DefaultLifecycleExecutionPlanCalculator.java:126) at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan (DefaultLifecycleExecutionPlanCalculator.java:144) at org.apache.maven.lifecycle.internal.builder.BuilderCommon.resolveBuildPlan (BuilderCommon.java:97) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:111) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288) at org.apache.maven.cli.MavenCli.main (MavenCli.java:192) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:567) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)

我正在使用 jdk-13.0.1 和 maven 3.6.2 并设置 JAVA_HOME 并将 JAVA_HOME\Bin 和 Maven 添加到我的路径中。

知道出了什么问题吗？

Answer 1

我看到您正在使用 JDK-13.0.1，而 Apache Beam 目前支持 Java 8。以下是 Java 和 Maven 的先决条件。

1. 下载并安装 Java 开发工具包 (JDK) 版本 8。确认 JAVA_HOME 环境变量已设置并指向您的 JDK 安装。
2. 按照特定操作系统的 Maven 安装指南下载并安装 Apache Maven。

完成 Java 和 Maven 的安装后，您可以使用以下命令获取代码

mvn archetype:generate \
      -DarchetypeGroupId=org.apache.beam \
      -DarchetypeArtifactId=beam-sdks-java-maven-archetypes-examples \
      -DarchetypeVersion=2.16.0 \
      -DgroupId=org.example \
      -DartifactId=word-count-beam \
      -Dversion="0.1" \
      -Dpackage=org.apache.beam.examples \
      -DinteractiveMode=false

到运行代码本地

cd word-count-beam/

mvn compile exec:java \
      -Dexec.mainClass=org.apache.beam.examples.WordCount \
      -Dexec.args="--output=./output/"

Answer 2

如果您使用的是 powershell，则使用“-D exec.mainClass”代替“-Dexec.mainClass”