代理背后使用Maven和SSL的问题

Question

我刚刚下载了Maven，并尝试运行“Maven in Five minutes”页面（http://Maven.apache.org/guides/getting-start/maven-in-five-minutes.html）上的简单命令。这是命令：

mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

当我运行它时，我得到一个SSL证书错误，无法从https://repo.Maven.apache.org/maven2的中央Maven存储库下载。错误为“SunCertPathBuilderException：无法找到到请求目标的有效证书路径”。

我坐在公司防火墙后面，已经通过settings.xml文件正确配置了HTTP和HTTPS访问的代理设置。我怀疑每个下载Maven并第一次运行它的人都必须导入Maven存储库的SSL证书，所以问题一定是出在代理上。有人有这方面的经验吗？

以下是完全调试模式（-x）下的堆栈跟踪：

 mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-11T22:58:10+02:00)
    Maven home: C:\Projects\maven\bin\..
    Java version: 1.7.0_45, vendor: Oracle Corporation
    Java home: C:\Program Files\Java\jdk1.7.0_45\jre
    Default locale: it_IT, platform encoding: Cp1252
    OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"
    [DEBUG] Using connector WagonRepositoryConnector with priority 0.0 for https://repo.maven.apache.org/maven2 via *****:8080 with username=*****, password=***
    Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
    [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-clean-plugin:2.5: 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
    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:122)
            at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor(DefaultMavenPluginManager.java:148)
            at org.apache.maven.plugin.DefaultBuildPluginManager.loadPlugin(DefaultBuildPluginManager.java:81)
            at org.apache.maven.plugin.prefix.internal.DefaultPluginPrefixResolver.resolveFromProject(DefaultPluginPrefixResolver.java:138)
            at org.apache.maven.plugin.prefix.internal.DefaultPluginPrefixResolver.resolveFromProject(DefaultPluginPrefixResolver.java:121)
            at org.apache.maven.plugin.prefix.internal.DefaultPluginPrefixResolver.resolve(DefaultPluginPrefixResolver.java:85)
            at org.apache.maven.lifecycle.internal.MojoDescriptorCreator.findPluginForPrefix(MojoDescriptorCreator.java:260)
            at org.apache.maven.lifecycle.internal.MojoDescriptorCreator.getMojoDescriptor(MojoDescriptorCreator.java:220)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleTaskSegmentCalculator.calculateTaskSegments(DefaultLifecycleTaskSegmentCalculator.java:103)
            at org.apache.maven.lifecycle.internal.DefaultLifecycleTaskSegmentCalculator.calculateTaskSegments(DefaultLifecycleTaskSegmentCalculator.java:83)
            at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:85)
            at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347)
            at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)
            at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)
            at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
            at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            at java.lang.reflect.Method.invoke(Method.java:606)
            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:349)
            at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:231)
            at org.eclipse.aether.internal.impl.DefaultRepositorySystem.readArtifactDescriptor(DefaultRepositorySystem.java:288)
            at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:108)
            ... 23 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 (https://repo.maven.apache.org/maven2): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:459)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:262)
            at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:239)
            at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:334)
            ... 26 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 (https://repo.maven.apache.org/maven2): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at org.eclipse.aether.connector.wagon.WagonRepositoryConnector$6.wrap(WagonRepositoryConnector.java:1016)
            at org.eclipse.aether.connector.wagon.WagonRepositoryConnector$6.wrap(WagonRepositoryConnector.java:1004)
            at org.eclipse.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:725)
            at org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:67)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
            at java.lang.Thread.run(Thread.java:744)
    Caused by: org.apache.maven.wagon.TransferFailedException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:935)
            at org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116)
            at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
            at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
            at org.eclipse.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:660)
            ... 4 more
    Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
            at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1884)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1341)
            at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)
            at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
            at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)
            at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1016)
            at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)
            at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)
            at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)
            at org.apache.maven.wagon.providers.http.httpclient.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:280)
            at org.apache.maven.wagon.providers.http.httpclient.impl.conn.HttpClientConnectionOperator.upgrade(HttpClientConnectionOperator.java:167)
            at org.apache.maven.wagon.providers.http.httpclient.impl.conn.PoolingHttpClientConnectionManager.upgrade(PoolingHttpClientConnectionManager.java:329)
            at org.apache.maven.wagon.providers.http.httpclient.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:392)
            at org.apache.maven.wagon.providers.http.httpclient.impl.execchain.MainClientExec.execute(MainClientExec.java:218)
            at org.apache.maven.wagon.providers.http.httpclient.impl.execchain.ProtocolExec.execute(ProtocolExec.java:194)
            at org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RetryExec.execute(RetryExec.java:85)
            at org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
            at org.apache.maven.wagon.providers.http.httpclient.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
            at org.apache.maven.wagon.providers.http.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
            at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:756)
            at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:854)
            ... 8 more
    Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:385)
            at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
            at sun.security.validator.Validator.validate(Validator.java:260)
            at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
            at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
            at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)
            ... 27 more
    Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
            at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
            ... 33 more

Answer 1

事实上，您的maven插件尝试连接到https远程存储库
（例如https://repo.maven.apache.org/maven2/)

这是Maven Central在2014年8月提供的一个新的SSL连接！

因此，请验证您的settings.xml是否具有正确的配置。

    <settings>
  <activeProfiles>
    <!--make the profile active all the time -->
    <activeProfile>securecentral</activeProfile>
  </activeProfiles>
  <profiles>
    <profile>
      <id>securecentral</id>
      <!--Override the repository (and pluginRepository) "central" from the
         Maven Super POM -->
      <repositories>
        <repository>
          <id>central</id>
          <url>http://repo1.maven.org/maven2</url>
          <releases>
            <enabled>true</enabled>
          </releases>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://repo1.maven.org/maven2</url>
          <releases>
            <enabled>true</enabled>
          </releases>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
</settings>

 <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <name>Maven Plugin Repository</name>
      <url>http://repo1.maven.org/maven2</url>
      <layout>default</layout>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
    </pluginRepository>
  </pluginRepositories>