Java Plugin org.jacoco:jacoco maven Plugin:无法解析其依赖项之一：

我正在使用SAML One登录工具包，从GitHub获得了最新的主分支，并使用EclipseOxy。它应该手动解决所有maven依赖项，但不幸的是，事实并非如此。我多次尝试删除.m2存储库，但这对我没有帮助。我还尝试了maven force更新。我得到以下错误

    Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T21:41:47+05:00)
Maven home: C:\Users\nyousaf\Downloads\java-saml-2.2.0\java-saml-2.2.0\core\EMBEDDED

[INFO] Scanning for projects...
[DEBUG] Extension realms for project com.onelogin:java-saml-core:jar:2.2.0: (none)
[DEBUG] Looking up lifecyle mappings for packaging jar from ClassRealm[plexus.core, parent: null]
[DEBUG] Extension realms for project com.onelogin:java-saml-toolkit:pom:2.2.0: (none)
[DEBUG] Looking up lifecyle mappings for packaging pom from ClassRealm[plexus.core, parent: null]
[DEBUG] === REACTOR BUILD PLAN ================================================
[DEBUG] Project: com.onelogin:java-saml-core:jar:2.2.0
[DEBUG] Tasks:   [compile]
[DEBUG] Style:   Regular
[DEBUG] =======================================================================
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building OneLogin java-saml Toolkit Core 2.2.0
[INFO] ------------------------------------------------------------------------
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[WARNING] The POM for org.jacoco:jacoco-maven-plugin:jar:0.7.7.201606060606 is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.187 s
[INFO] Finished at: 2017-11-01T13:33:47+05:00
[INFO] Final Memory: 6M/123M
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.jacoco:jacoco-maven-plugin:0.7.7.201606060606 or one of its dependencies could not be resolved: Cannot access central (http://repo1.maven.org/maven2) in offline mode and the artifact org.jacoco:jacoco-maven-plugin:jar:0.7.7.201606060606 has not been downloaded from it before. -> [Help 1]
org.apache.maven.plugin.PluginResolutionException: Plugin org.jacoco:jacoco-maven-plugin:0.7.7.201606060606 or one of its dependencies could not be resolved: Cannot access central (http://repo1.maven.org/maven2) in offline mode and the artifact org.jacoco:jacoco-maven-plugin:jar:0.7.7.201606060606 has not been downloaded from it before.
    at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:128)
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor(DefaultMavenPluginManager.java:179)
    at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getMojoDescriptor(DefaultMavenPluginManager.java:284)
    at org.apache.maven.plugin.DefaultBuildPluginManager.getMojoDescriptor(DefaultBuildPluginManager.java:241)
    at org.apache.maven.lifecycle.internal.DefaultLifecycleMappingDelegate.calculateLifecycleMappings(DefaultLifecycleMappingDelegate.java:110)
    at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateLifecycleMappings(DefaultLifecycleExecutionPlanCalculator.java:266)
    at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateMojoExecutions(DefaultLifecycleExecutionPlanCalculator.java:217)
    at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan(DefaultLifecycleExecutionPlanCalculator.java:127)
    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:109)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    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:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    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.ArtifactResolutionException: Cannot access central (http://repo1.maven.org/maven2) in offline mode and the artifact org.jacoco:jacoco-maven-plugin:jar:0.7.7.201606060606 has not been downloaded from it before.
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:294)
    at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:124)
    ... 27 more
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Cannot access central (http://repo1.maven.org/maven2) in offline mode and the artifact org.jacoco:jacoco-maven-plugin:jar:0.7.7.201606060606 has not been downloaded from it before.
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:391)
    ... 31 more
Caused by: org.eclipse.aether.transfer.RepositoryOfflineException: Cannot access central (http://repo1.maven.org/maven2) in offline mode
    at org.eclipse.aether.internal.impl.DefaultOfflineController.checkOffline(DefaultOfflineController.java:72)
    at org.eclipse.aether.internal.impl.Utils.checkOffline(Utils.java:115)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:387)
    ... 31 more

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如果您在corporate proxy之后，且未配置maven proxy，则会发生此错误。

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用于在Maven中启用代理设置

如果您在corporate proxy之后且未配置Maven proxy，则会发生此错误。

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用于在Maven中启用代理设置

Maven认为它处于脱机模式。感谢@ThorbjørnRavnAndersen的快速响应，但我如何使它认为它不是脱机模式导致该输出的命令行是什么？我使用了Eclipse Maven构建，在配置中我没有检查脱机并启动此构建，但是，我没有首先从命令行使用任何commandBuild

mvn clean install

在返回Eclipse之前应该可以运行。Maven认为它处于脱机模式。感谢@Thorbjørnravandersen的快速响应，但我如何才能让它认为它不是脱机模式导致该输出的命令行是什么？我使用了Eclipse Maven Build，在配置中我没有检查脱机并启动但是，我没有首先从命令行使用任何commandBuild<代码>mvn清洁安装在返回Eclipse之前应该可以正常工作。