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https://issues.jenkins-ci.org/browse/JENKINS-12579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=159206#comment-159206
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Simon Wiest commented on JENKINS-12579:
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The errors come and go when reloading the page. So, sometimes one gets a
flawless page without any errors, sometimes errors only, sometimes a mix.
There's a JIRA ticket at Atlassian for the problem
(https://jira.atlassian.com/browse/CONF-15313).
In addition the problem already faced up in the Jenkins Wiki some months ago
(http://jenkins.361315.n4.nabble.com/Wiki-issue-td2541738.html).
Perhaps restarting Confluence will mitigate the problem (albeit not solve
it...)?
> On "Plugins" Wiki page: Error formatting macro: contentbylabel:
> java.util.ConcurrentModificationException
> ---------------------------------------------------------------------------------------------------------
>
> Key: JENKINS-12579
> URL: https://issues.jenkins-ci.org/browse/JENKINS-12579
> Project: Jenkins
> Issue Type: Bug
> Components: core
> Reporter: Falko Modler
> Labels: wiki
> Attachments: jenkins_wiki_CME.png
>
>
> Most of the time when opening
> https://wiki.jenkins-ci.org/display/JENKINS/Plugins, multiple errors occur:
> "Error formatting macro: contentbylabel:
> java.util.ConcurrentModificationException"
> See attached screenshot.
> PS: I did not find a component like "documentation", "wiki" or "website", so
> I chose "core".
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