Failure when offline with the XWiki Packager Maven Plugin

[ERROR] Failed to execute goal org.xwiki.platform:xwiki-platform-tool-packager-plugin:8.4.2-SNAPSHOT:package (default) on project xwiki-platform-activeinstalls-test-tests: Failed to write descriptor for artifact [com.atlassian.clover:clover:jar:4.1.2:compile]: Failed to build project for [com.atlassian.clover:clover:jar:4.1.2:compile]: Error resolving project artifact: Cannot access xwiki-releases (http://nexus.xwiki.org/nexus/content/groups/public) in offline mode and the artifact com.atlassian.clover:clover:pom:4.1.2 has not been downloaded from it before. for project com.atlassian.clover:clover:jar:4.1.2 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.xwiki.platform:xwiki-platform-tool-packager-plugin:8.4.2-SNAPSHOT:package (default) on project xwiki-platform-activeinstalls-test-tests: Failed to write descriptor for artifact [com.atlassian.clover:clover:jar:4.1.2:compile]
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
	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:116)
	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:497)
	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.apache.maven.plugin.MojoExecutionException: Failed to write descriptor for artifact [com.atlassian.clover:clover:jar:4.1.2:compile]
	at org.xwiki.tool.extension.util.AbstractExtensionMojo.saveExtension(AbstractExtensionMojo.java:193)
	at org.xwiki.tool.packager.PackageMojo.installJAR(PackageMojo.java:253)
	at org.xwiki.tool.packager.PackageMojo.execute(PackageMojo.java:210)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	... 20 more
Caused by: org.apache.maven.plugin.MojoExecutionException: Failed to build project for [com.atlassian.clover:clover:jar:4.1.2:compile]
	at org.xwiki.tool.extension.util.AbstractExtensionMojo.getMavenProject(AbstractExtensionMojo.java:115)
	at org.xwiki.tool.extension.util.AbstractExtensionMojo.saveExtension(AbstractExtensionMojo.java:135)
	at org.xwiki.tool.extension.util.AbstractExtensionMojo.saveExtension(AbstractExtensionMojo.java:191)
	... 24 more
Caused by: org.apache.maven.project.ProjectBuildingException: Error resolving project artifact: Cannot access xwiki-releases (http://nexus.xwiki.org/nexus/content/groups/public) in offline mode and the artifact com.atlassian.clover:clover:pom:4.1.2 has not been downloaded from it before. for project com.atlassian.clover:clover:jar:4.1.2
	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:355)
	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:287)
	at org.xwiki.tool.extension.util.AbstractExtensionMojo.getMavenProject(AbstractExtensionMojo.java:112)
	... 26 more
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Cannot access xwiki-releases (http://nexus.xwiki.org/nexus/content/groups/public) in offline mode and the artifact com.atlassian.clover:clover:pom:4.1.2 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.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:344)
	... 28 more
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Cannot access xwiki-releases (http://nexus.xwiki.org/nexus/content/groups/public) in offline mode and the artifact com.atlassian.clover:clover:pom:4.1.2 has not been downloaded from it before.
	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:391)
	... 32 more
Caused by: org.eclipse.aether.transfer.RepositoryOfflineException: Cannot access xwiki-releases (http://nexus.xwiki.org/nexus/content/groups/public) 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)
	... 32 more
[ERROR] 

vmassol@vmassol ~/dev/xwiki/git/xwiki-platform (stable-8.4.x *) $ ls -l  /Users/vmassol/.m2/repository/com/atlassian/clover/clover/4.1.2/
total 35224
-rw-r--r--  1 vmassol  staff       248 Dec  3 15:04 _remote.repositories
-rw-r--r--  1 vmassol  staff  18014381 Dec  3 15:04 clover-4.1.2.jar
-rw-r--r--  1 vmassol  staff        40 Dec  3 15:04 clover-4.1.2.jar.sha1
-rw-r--r--  1 vmassol  staff      2815 Dec  3 15:04 clover-4.1.2.pom
-rw-r--r--  1 vmassol  staff        40 Dec  3 15:04 clover-4.1.2.pom.sha1