解决Maven依赖关系：代理身份验证问题

Question

我在一家公司工作，本地机器在代理背后工作。代理不需要身份验证。我在IntelliJ中有一个maven项目，它可以在我的笔记本电脑上工作，但我不能在本地机器上工作。

• 所以我已经在本地计算机上导入了项目。
• 在IntelliJ中设置代理设置
• 在maven settings.xml中设置代理设置，如此stackoverflow查询所示

我还尝试了本问题中提供的解决方案，其中我将-dproxyset=true-dproxyhost=myproxy.com-dproxyport=3128添加到代理设置中。

    [INFO] Error stacktraces are turned on.
    [INFO] Scanning for projects...
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building testforce 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD FAILURE
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 0.845 s
    [INFO] Finished at: 2018-01-23T11:32:41+01:00
    [INFO] Final Memory: 12M/309M
    [INFO] ------------------------------------------------------------------------
    [ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to central (http://repo1.maven.org/maven2): Not authorized by proxy , ReasonPhrase:Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ). -> [Help 1]
    org.apache.maven.plugin.PluginResolutionException: Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5
            at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:117)
            at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor(DefaultMavenPluginManager.java:181)
            at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getMojoDescriptor(DefaultMavenPluginManager.java:286)
            at org.apache.maven.plugin.DefaultBuildPluginManager.getMojoDescriptor(DefaultBuildPluginManager.java:241)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecution(DefaultLifecycleExecutionPlanCalculator.java:169)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecutions(DefaultLifecycleExecutionPlanCalculator.java:155)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan(DefaultLifecycleExecutionPlanCalculator.java:131)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan(DefaultLifecycleExecutionPlanCalculator.java:145)
            at org.apache.maven.lifecycle.internal.builder.BuilderCommon.resolveBuildPlan(BuilderCommon.java:96)
            at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:110)
            at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
            at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
            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:993)
            at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
            at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
            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.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5
            at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:283)
            at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:199)
            at org.eclipse.aether.internal.impl.DefaultRepositorySystem.readArtifactDescriptor(DefaultRepositorySystem.java:296)
            at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:103)
            ... 26 more
    Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to central (http://repo1.maven.org/maven2): Not authorized by proxy , ReasonPhrase:Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ).
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:453)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:255)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:232)
            at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:268)
            ... 29 more
    Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to central (http://repo1.maven.org/maven2): Not authorized by proxy , ReasonPhrase:Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ).
            at org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed(ArtifactTransportListener.java:52)
            at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:364)
            at org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:76)
            at org.eclipse.aether.connector.basic.BasicRepositoryConnector$DirectExecutor.execute(BasicRepositoryConnector.java:590)
            at org.eclipse.aether.connector.basic.BasicRepositoryConnector.get(BasicRepositoryConnector.java:258)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:529)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:430)
            ... 32 more
    Caused by: org.apache.maven.wagon.authorization.AuthorizationException: Not authorized by proxy , ReasonPhrase:Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ).
            at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:1011)
            at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:962)
            at org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:126)
            at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
            at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
            at org.eclipse.aether.transport.wagon.WagonTransporter$GetTaskRunner.run(WagonTransporter.java:569)
            at org.eclipse.aether.transport.wagon.WagonTransporter.execute(WagonTransporter.java:436)
            at org.eclipse.aether.transport.wagon.WagonTransporter.get(WagonTransporter.java:413)
            at org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:456)
            at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:359)
            ... 37 more
    [ERROR]
    [ERROR] Re-run Maven using the -X switch to enable full debug logging.
    [ERROR]
    [ERROR] For more information about the errors and possible solutions, please read the following articles:
    [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

因此，根据错误，它未能在代理上进行身份验证，但代理不需要身份验证。有办法解决这个问题吗？

Answer 1

请确保在maven文件夹/conf/settings.xml中声明代理：

 <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>https</protocol>
      <username>user</username>
      <password></password>
      <host>proxyhost</host>
      <port>443</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
</proxy>  

确保在Intellij项目中链接正确的Settings.xml，单击File\Settings\Maven\User Settings文件。

而且你的确切错误是

org.apache.maven.plugin.pluginResolutionException

看来您需要在pom.xml中声明依赖项的pluginrepo，否则依赖项将不再从最早的repo管理。事实上，依赖关系2.5是超级旧的，请尝试：

<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-clean-plugin -->
<dependency>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-clean-plugin</artifactId>
    <version>3.0.0</version>
</dependency>

编辑：

可能由于代理设置（可能是Kerberos NTLM代理），请在settings.xml中尝试此操作：

  <username>DOMAINNAME\USERNAME</username>