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https://issues.apache.org/jira/browse/JSPWIKI-932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186719#comment-15186719
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Harry Metske commented on JSPWIKI-932:
--------------------------------------
Do you have a stacktrace around? Maybe in catalina.out or wherever you
redirected your stdout/stderr ?
> Failed to start managers. java.util.ConcurrentModificationException
> -------------------------------------------------------------------
>
> Key: JSPWIKI-932
> URL: https://issues.apache.org/jira/browse/JSPWIKI-932
> Project: JSPWiki
> Issue Type: Bug
> Affects Versions: 2.10.1
> Reporter: Christopher Janitschke
> Priority: Minor
>
> Hi,
> if i restart the tomcat, sometimes one of the JSPWiki's won't come up again,
> due to java.util.ConcurrentModificationException.
> Any ideas?
> I have about 16 JSPWiki's on one server. Is it simply too much?
> Tomcat Version 8.0.22
> JSP-Log:
> 2016-03-03 04:31:23,386 [wikiland.de-startStop-1] FATAL
> org.apache.wiki.WikiEngine - Failed to start managers.
> java.util.ConcurrentModificationException
> 2016-03-03 04:31:23,387 [wikiland.de-startStop-1] ERROR
> org.apache.wiki.WikiEngine - ERROR: Failed to create a Wiki engine,
> stacktrace follows
> org.apache.wiki.api.exceptions.WikiException: JSPWiki: Unable to load and
> setup properties from jspwiki.properties. Failed to start managers: null
> 2016-03-03 04:31:23,460 [JSPWiki Lucene Indexer] ERROR
> org.apache.wiki.search.LuceneSearchProvider - Unable to start lucene
> java.lang.IllegalStateException: Can't overwrite cause with
> java.lang.IllegalStateException: Illegal access: this web application
> instance has been stopped already.
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