尝试在 Maven 版本上运行并行构建准备和执行任务时出现 Ger 错误？答案

【问题标题】：Ger error when trying to run parallel builds on maven release prepare and perform task?尝试在 Maven 版本上运行并行构建准备和执行任务时出现 Ger 错误？
【发布时间】：2020-07-03 18:04:33
【问题描述】：

我找到了一些提高标准 maven 构建速度的方法，例如仅构建已更改的模块和利用并行构建。对于任务：

clean release:prepare release:perform

这需要一段时间，我想加快速度。似乎并行构建不起作用我收到一个错误。我在运行并行构建时遇到的错误是：

[ERROR] NullPointerException
[ERROR] java.util.concurrent.ExecutionException: java.lang.NullPointerException

运行命令时：

clean -T 1C release:prepare release:perform

这似乎是我得到的唯一错误 - 不知道为什么？当我使用此标志运行正常构建时，这不是问题。

还有关于如何加快这个过程的任何建议？我假设我可以跳过测试，并且在与 master 合并之前，它们已经在 dev 分支上的构建中完成了？

编辑：已添加以下带有调试标志的错误消息：

[INFO] Final Memory: 42M/304M
[INFO] ------------------------------------------------------------------------
[ERROR] NullPointerException
java.lang.NullPointerException
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.calcImports (DefaultMavenPluginManager.java:470)
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.setupPluginRealm (DefaultMavenPluginManager.java:355)
    at org.apache.maven.plugin.DefaultBuildPluginManager.getPluginRealm (DefaultBuildPluginManager.java:231)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:102)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:200)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:196)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
    at java.lang.Thread.run (Thread.java:748)
[ERROR] java.lang.NullPointerException
java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report (FutureTask.java:122)
    at java.util.concurrent.FutureTask.get (FutureTask.java:192)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder.multiThreadedProjectTaskSegmentBuild (MultiThreadedBuilder.java:140)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder.build (MultiThreadedBuilder.java:101)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:955)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
    at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: java.lang.NullPointerException
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.calcImports (DefaultMavenPluginManager.java:470)
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.setupPluginRealm (DefaultMavenPluginManager.java:355)
    at org.apache.maven.plugin.DefaultBuildPluginManager.getPluginRealm (DefaultBuildPluginManager.java:231)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:102)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:200)
    at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call (MultiThreadedBuilder.java:196)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:511)
    at java.util.concurrent.FutureTask.run (FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:624)
    at java.lang.Thread.run (Thread.java:748)
[ERROR]

【问题讨论】：

运行-T 1C 是没有意义的，因为release:prepare 运行一个目标，release:perform 也是如此。问题是：您是否想使用 -T 1C 运行构建本身，您必须进行不同的配置。除此之外，NPE 不应该发生...您能说明您使用的是哪个版本的 Maven 和 maven-release-plugin？
发布插件是maven-release-plugin:2.5.3，maven是3.5.2
请使用-X 运行构建并在您的问题中发布完整的堆栈跟踪。
无法将完整的堆栈跟踪作为私有信息发布，但已将错误与调试标志放在上面
请升级到最新的 Maven 版本 3.6.3 ...以这种方式在发布版本中运行您的构建将不起作用...但这是一个不同的故事，让我们解决第一个问题.. .

标签： java maven build continuous-integration pom.xml

【解决方案1】：

感谢@khmarbaise 提出修复建议。这可以通过最新的 maven 版本解决，可以在 3.6.1 版本的发行说明中看到

http://maven.apache.org/docs/3.6.1/release-notes.html

【讨论】：