未能执行目标net.alchim31.maven:scala-maven-plugin:3.2.0:compile (scala-编译)

Question

我试图在Intellij IDEA a scala maven项目上进行测试

当我跑的时候

mvn试验

我知道这个错误：

 Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.0:compile (scala-compile) on project neo4j-spark-connector: Execution scala-compile of goal net.alchim31.maven:scala-maven-plugin:3.2.0:compile failed: For artifact {null:null:null:jar}: The groupId cannot be empty.

这就是我刚才添加的依赖项pom.xml：

 <dependency>
    <groupId>neo4j-contrib</groupId>
    <artifactId>neo4j-spark-connector</artifactId>
     <version>2.1.0-M4</version>
 </dependency>

这是错误日志：

[ERROR] Failed to execute goal net.alchim31.maven:scala-maven- plugin:3.2.0:compile (scala-compile) on project neo4j-spark-connector:   Execution scala-compile of goal net.alchim31.maven:scal
a-maven-plugin:3.2.0:compile failed: For artifact {null:null:null:jar}:  The groupId cannot be empty. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute   goal net.alchim31.maven:scala-maven-plugin:3.2.0:compile (scala-compile) on  project neo4j-spark-connector: Execution scala-compile of goal net.alchim31.maven:scala-maven-plugin:3.2.0:compile failed: For artifact {null:null:null:jar}: The groupId cannot be empty.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:213)
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.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: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: org.apache.maven.plugin.PluginExecutionException: Execution scala-compile of goal net.alchim31.maven:scala-maven-plugin:3.2.0:compile failed: For artifact {null:null:null:jar}:
The groupId cannot be empty.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:148)
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.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: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: org.apache.maven.artifact.InvalidArtifactRTException: For artifact {null:null:null:jar}: The groupId cannot be empty.
at org.apache.maven.artifact.DefaultArtifact.validateIdentity (DefaultArtifact.java:131)
at org.apache.maven.artifact.DefaultArtifact.<init> (DefaultArtifact.java:124)
at org.apache.maven.bridge.MavenRepositorySystem.createArtifactX (MavenRepositorySystem.java:565)
at org.apache.maven.bridge.MavenRepositorySystem.createArtifactX (MavenRepositorySystem.java:524)

.这是什么，我可以从错误日志，网站不允许更多如何修复它？

Answer 1

我发现了与我的maven-scala-plugin相同的问题，所以我将这里升级到3.3.3而不是3.2.0，之前的错误消失了

Answer 2

1. 如果您使用的是最新版本的maven (如3.5)，请将scala插件升级到3.4.2，因为更改是根据对maven的依赖管理进行的。
2. 将scala库依赖项的作用域从提供改为“编译”(或删除范围)。“提供”范围可能会给"mvn测试“带来麻烦(我不记得是否在测试中提供了)
3. 如果使用了新4j火花连接器的pom.xml，那么为什么要将自身添加为依赖项呢？这可能是你麻烦的原因(A取决于A)

Answer 3

我也有同样的问题，而我发现的是:有时候，它是因为编译错误，特别是当您使用intellij时。