maven：UnknownHostException：repo.maven.apache.org

我遇到这个行家问题：

[错误]插件org.apache.maven.plugins：maven-resources-plugin：2.6或其依赖项之一无法解析：无法读取org.apache.maven.plugins：maven-resources-plugin：jar的工件描述符：2.6：无法从/到中央传输工件org.apache.maven.plugins：maven-resources-plugin：pom：2.6（http://repo.maven.apache.org/maven2）：repo.maven.apache.org：未知主机repo.maven.apache.org-> [帮助1] org.apache.maven.plugin.PluginResolutionException：插件org.apache.maven.plugins：maven-resources-plugin： 2.6或其依赖项之一无法解析：无法读取org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve（DefaultPluginDependenciesResolver上的org.apache.maven.plugins：maven-resources-plugin：jar：2.6的工件描述符.java：129），位于org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor（DefaultMavenPluginManager.java:142），位于org.apache.maven.plugin.internal.DefaultMavenPluginManager.getMojoDescriptor（DefaultMavenPluginManager.java:261）。 org.apache.maven.lifecycle.internal上的apache.maven.plugin.DefaultBuildPluginManager.getMojoDescriptor（DefaultBuildPluginManager.java:185）。org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecutions（DefaultLifecycleExecutionPlanCalculator.java:139）的DefaultLifecycleExecutionPlanCalculator.setupMojoExecution（DefaultLifecycleExecutionPlanCalculator.java:152）在org.apache.mavenlife.Default 116）在org.apache.maven.lifecycle.internal.BuilderCommon.resolveBuildPlan（BuilderCommon.java:92）在org.apache.maven.lifecycle.internal.BuilderCommon.resolveBuildPlan（BuilderCommon.java:92）在org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan（DefaultLifecycleExecutionPlanCalculator.java:129） .lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder.java:81）位于org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder。java：59）在org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild（LifecycleStarter.java:183）在org.apache.maven.lifecycle.internal.LifecycleStarter.execute（LifecycleStarter.java:161）在org.apache org.apache.maven.DefaultMaven.execute（DefaultMaven.java:156）的org.apache.maven.cli.MavenCli.execute（MavenCli.java:537）的.maven.DefaultMaven.doExecute（DefaultMaven.java:320）在org.apache.maven.DefaultMaven.execute（DefaultMaven.java:156）在org.apache.maven.cli.MavenCli.execute（MavenCli.java:537）在org.apache.maven.cli.MavenCli.doMain（MavenCli.java:196）at org.apache.maven.cli.MavenCli.main（MavenCli.java:141）at sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）位于org.codehaus的java.lang.reflect.Method.invoke（Method.java:622）处的sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）处的sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57） .plexus.classworlds.launcher.Launcher。在org.codehaus.plexus.classworlds.launcher.Launcher.launch（Launcher.java:230）处的launchEnhanced（Launcher.java:290）在org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode（Launcher.java:409）处的launcher.launch（Launcher.java:230）在org.codehaus.plexus.classworlds.launcher.Launcher.main（Launcher.java:352）造成原因：org.sonatype.aether.resolution.ArtifactDescriptorException：无法读取org.apache.maven.plugins：maven-的工件描述符org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom（DefaultArtifactDescriptorReader.java:296）上的resources-plugin：jar：2.6，org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor（DefaultArtifactDescriptorReader）上的资源插件（DefaultArtifactDescriptorReader.java:296）位于org.apache.maven.plugin.internal的org.sonatype.aether.impl.internal.DefaultRepositorySystem.readArtifactDescriptor（DefaultRepositorySystem.java:279）。DefaultPluginDependenciesResolver.resolve（DefaultPluginDependenciesResolver.java:115）... 25更多原因：org.sonatype.aether.resolution.ArtifactResolutionException：无法传输工件org.apache.maven.plugins：maven-resources-plugin：pom：2.6从/到中央（http://repo.maven.apache.org/maven2）：位于org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve（DefaultArtifactResolver.java:538）的repo.maven.apache.org。位于org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact（DefaultArtifactResolver.java:193）的impl.internal.DefaultArtifactResolver.resolveArtifacts（DefaultArtifactResolver.java:216）在org.apache.maven.repository.internal（DefaultArtifact DefaultArtifactDescriptorReader.java:281）...更多28个原因：org.sonatype.aether.transfer.ArtifactTransferException：无法将工件org.apache.maven.plugins：maven-resources-plugin：pom：2.6从中央转移到中央（http://repo.maven.apache.org/maven2）：repo.maven.apache.org在org.sonatype.aether.connector.wagon.WagonRepositoryConnector $ 4.wrap（WagonRepositoryConnector.java:951）在org.sonatype.aether.connector.wagon.WagonRepositoryConnector $ 4.wrap（WagonRepositoryConnector.java ：939），位于org.sonatype.aether.util.concurrency.RunnableErrorForwarder $ 1.run（RunnableErrorForwarder.java:60），位于org.sonatype.aether.connector.wagon.WagonRepositoryConnector $ GetTask.run（WagonRepositoryConnector.java:669） .util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1146）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615）at java.lang.Thread.run（Thread.java:701）创建者：org.apache.maven.wagon.TransferFailedException：org.apache.maven.wagon.shared处的repo.maven.apache.org。org.org上的http.AbstractHttpClientWagon.fillInputData（AbstractHttpClientWagon.java:567）。org.apache.maven.wagon.StreamWagon.getIfNewer（StreamWagon.java:88）上的apache.maven.wagon.StreamWagon.getInputStream（StreamWagon.java:116）在org.apache.maven.wagon.StreamWagon.get（StreamWagon。 java：61）at org.sonatype.aether.connector.wagon.WagonRepositoryConnector $ GetTask.run（WagonRepositoryConnector.java:601）... 4更多原因：java.net.UnknownHostException：repo.maven.apache.org .net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:175）在java.net.SocksSocketImpl.connect（SocksSocketImpl.java:385）在java.net.Socket.connect（Socket.java:546）在java.net.Socket。 org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket处的java.net.Socket。（Socket.java:266）处的connect（Socket.java:495） （DefaultProtocolSocketFactory.java:80），位于org.apache.commons.httpclient.protocol。org.apache.commons.httpclient.HttpConnection.open（HttpConnection.java:707）的DefaultProtocolSocketFactory.createSocket（DefaultProtocolSocketFactory.java:122）org.apache.commons.httpclient.MultiThreadedHttpConnectionManager $ HttpConnectionAdapter.open（MultiThreadedHttpConnectionManager.java:1361）在org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry（HttpMethodDirector.java:387）在org.apache.commons.httpclient.HttpMethodDirector.executeMethod（HttpMethodDirector.java:171）在org.apache.commons.httpclient.HttpClient.executeMethod （HttpClient.java:397）位于org.apache.commons.httpclient.HttpClient.executeMethod（HttpClient.java:323）位于org.apache.maven.wagon.shared.http.AbstractHttpClientWagon.execute（AbstractHttpClientWagon.java:446） org.apache.maven.wagon.shared.http.AbstractHttpClientWagon.fillInputData（AbstractHttpClientWagon.java：561）...还有8

我确实有互联网连接。而且我没有代理人。