This stack trace looks more like a consequence than a cause. You
probably have another error before this one, if you don't see anything
it probably means you need to enable Tomcat startup log.
See
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/InstallationTomcat#HSEV….
On Tue, Apr 19, 2016 at 10:15 PM, matti <matthias.albert(a)gmx.de> wrote:
  Hello,
 our XWiki installation isn't running anymore. After restarting Tomcat, there
 is always the stacktrace below. No change to content has been made, afaik.
 Any help is most welcome. The XWiki version is 5.2.1 according to the
 "version.properties" file.
 Matthias
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