[ERROR] Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.3:clean (default-clean) on project faq-parent: Execution default-clean of goal org.apache.maven.plugins:maven-clean-plugin:2.3:clean failed: Plugin org.apache.maven.plugins:maven-clean-plugin:2.3 or one of its dependencies could not be resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-clean-plugin:jar:2.3 (): Failed to read artifact descriptor for junit:junit:jar:3.8.1: Could not transfer artifact junit:junit:pom:3.8.1 from/to central (https://companyname.de/artifactory/plugins-release): peer not authenticated -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.3:clean (default-clean) on project faq-parent: Execution default-clean of goal org.apache.maven.plugins:maven-clean-plugin:2.3:clean failed: Plugin org.apache.maven.plugins:maven-clean-plugin:2.3 or one of its dependencies could not be resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-clean-plugin:jar:2.3 ()
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	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:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-clean of goal org.apache.maven.plugins:maven-clean-plugin:2.3:clean failed: Plugin org.apache.maven.plugins:maven-clean-plugin:2.3 or one of its dependencies could not be resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-clean-plugin:jar:2.3 ()
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:82)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: org.apache.maven.plugin.PluginResolutionException: Plugin org.apache.maven.plugins:maven-clean-plugin:2.3 or one of its dependencies could not be resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-clean-plugin:jar:2.3 ()
	at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:211)
	at org.apache.maven.plugin.internal.DefaultMavenPluginManager.createPluginRealm(DefaultMavenPluginManager.java:353)
	at org.apache.maven.plugin.internal.DefaultMavenPluginManager.setupPluginRealm(DefaultMavenPluginManager.java:321)
	at org.apache.maven.plugin.DefaultBuildPluginManager.getPluginRealm(DefaultBuildPluginManager.java:175)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:78)
	... 20 more
Caused by: org.sonatype.aether.collection.DependencyCollectionException: Failed to collect dependencies for org.apache.maven.plugins:maven-clean-plugin:jar:2.3 ()
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:258)
	at org.sonatype.aether.impl.internal.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:308)
	at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:199)
	... 24 more
Caused by: org.sonatype.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for junit:junit:jar:3.8.1
	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:296)
	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:186)
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:412)
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:544)
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:544)
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:544)
	at org.sonatype.aether.impl.internal.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:240)
	... 26 more
Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could not transfer artifact junit:junit:pom:3.8.1 from/to central (https://mvn.companyname.de/artifactory/plugins-release): peer not authenticated
	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:538)
	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216)
	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:193)
	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:281)
	... 32 more
Caused by: org.sonatype.aether.transfer.ArtifactTransferException: Could not transfer artifact junit:junit:pom:3.8.1 from/to central (https://mvn.companyname.de/artifactory/plugins-release): peer not authenticated
	at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:951)
	at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:939)
	at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:669)
	at org.sonatype.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:60)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)
Caused by: org.apache.maven.wagon.TransferFailedException: peer not authenticated
	at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:799)
	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.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:601)
	... 4 more
Caused by: javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
	at sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:397)
	at org.apache.maven.wagon.providers.http.httpclient.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:128)
	at org.apache.maven.wagon.providers.http.httpclient.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:390)
	at org.apache.maven.wagon.providers.http.httpclient.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:148)
	at org.apache.maven.wagon.providers.http.httpclient.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
	at org.apache.maven.wagon.providers.http.httpclient.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
	at org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
	at org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
	at org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
	at org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
	at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:674)
	at org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:793)
	... 8 more
[ERROR]
[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