Java 11：目标org.apache.maven.plugins的执行默认编译：maven-compiler-plugin：3.8.0：编译失败。：NullPointerException

【问题标题】：Java 11 : Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile failed.: NullPointerExceptionJava 11：目标org.apache.maven.plugins的执行默认编译：maven-compiler-plugin：3.8.0：编译失败。：NullPointerException
【发布时间】：2020-05-19 08:55:52
【问题描述】：

我正在将我的项目从 java 8 升级到 java 11。我能够使用 java11、spring 5 依赖项构建和部署它，但是当我将 module-info.java 添加到我的项目中时，我在构建时遇到错误：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project infrastructure: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile failed.: NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project infrastructure: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    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:566)
    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: org.apache.maven.plugin.PluginExecutionException: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:148)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    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:566)
    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.compiler.CompilerMojo.preparePaths (CompilerMojo.java:244)
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:787)
    at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:188)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    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:566)
    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)


Cannot find ArtifactResolver with hint: project-cache-aware
org.codehaus.plexus.component.repository.exception.ComponentLookupException: java.util.NoSuchElementException
      role: org.apache.maven.artifact.resolver.ArtifactResolver
  roleHint: project-cache-aware
    at org.codehaus.plexus.DefaultPlexusContainer.lookup (DefaultPlexusContainer.java:267)
    at org.codehaus.plexus.DefaultPlexusContainer.lookup (DefaultPlexusContainer.java:243)
    at org.apache.maven.shared.repository.DefaultRepositoryAssembler.contextualize (DefaultRepositoryAssembler.java:721)
    at org.eclipse.sisu.plexus.PlexusLifecycleManager.contextualize (PlexusLifecycleManager.java:282)
    at org.eclipse.sisu.plexus.PlexusLifecycleManager.activate (PlexusLifecycleManager.java:203)
    at org.eclipse.sisu.bean.BeanScheduler.schedule (BeanScheduler.java:151)
    at org.eclipse.sisu.plexus.PlexusLifecycleManager.manage (PlexusLifecycleManager.java:147)
    at org.eclipse.sisu.plexus.PlexusBeanBinder.afterInjection (PlexusBeanBinder.java:72)
    at com.google.inject.internal.MembersInjectorImpl.notifyListeners (MembersInjectorImpl.java:131)
Caused by: java.util.NoSuchElementException
    at java.util.Collections$EmptyIterator.next (Collections.java:4210)
    at org.codehaus.plexus.DefaultPlexusContainer.lookup (DefaultPlexusContainer.java:263)
    at org.codehaus.plexus.DefaultPlexusContainer.lookup (DefaultPlexusContainer.java:243)
    at org.apache.maven.shared.repository.DefaultRepositoryAssembler.contextualize (DefaultRepositoryAssembler.java:721)

我在我的 pom 文件中添加了 maven-compiler-plugin 如下：

<properties>
    <java.version>11</java.version>
    <maven.compiler.source>${java.version}</maven.compiler.source>
    <maven.compiler.target>${java.version}</maven.compiler.target>
    <maven.compiler.release>${java.version}</maven.compiler.release>
 </properties>

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <release>${java.version}</release>
        <source>${java.version}</source>
        <target>${java.version}</target>
    </configuration>
</plugin>

如果我做错了什么，请指导我。

【问题讨论】：

  • 刚开始排除不需要的差异，如果source 和target 属性和标签都与release 相同，请删除它们。虽然在这里有一个最小的可重现代码示例也会非常有帮助。例如你也配置了maven-assembly？
  • 什么是 Plexus 容器版本？
  • 升级到最新版本的maven-compiler-plugin...如果你使用JDK11你只需要设置release...

标签： java maven java-11 maven-compiler-plugin module-info


【解决方案1】：

这是Maven-Compiler-Plugin中的一个错误

看看以下问题：
https://issues.apache.org/jira/browse/MCOMPILER-355
https://issues.apache.org/jira/browse/MCOMPILER-359

特别是在行号CompilerMojo.java:244

Caused by: java.lang.NullPointerException
 at org.apache.maven.plugin.compiler.CompilerMojo.preparePaths (CompilerMojo.java:244)

MCOMPILER-355 在版本 3.8.1 中已修复。

MCOMPILER-359 修复将成为下一个版本的一部分 https://github.com/apache/maven-compiler-plugin/pull/28/files

您应该尝试将Maven-Compiler-Plugin 的版本更新为3.8.1。

【讨论】：

  • 非常感谢....升级 maven-Compiler-Plugin 到 3.8.1 解决了这个问题
【解决方案2】：

对我来说，将 maven-compiler-plugin 更新到版本 3.8.1 是不够的。 我也有这个问题：https://bugs.openjdk.java.net/browse/JDK-8216202

为了解决这个问题，我在 maven-compiler-plugin 中添加了这个配置：forceJavacCompilerUse

例如：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
    <configuration>
        <source>${java.version}</source>
        <target>${java.version}</target>
        <forceJavacCompilerUse>true</forceJavacCompilerUse>
    </configuration>
</plugin>

【讨论】：

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