Whilst upgrading the SSO for Atlassian Data Center from 4.2.17 to 4.2.20 on Confluence 8.0.2, an error occurred. The error has resulted in Confluence being completely in-operable and displaying in plain text.
It reports Logo System Error and the diagnostic below.
Filter execution threw an exception
com/opensymphony/xwork/config/ConfigurationManager
I have restarted Confluence and the host server to no avail.
Has anybody got any ideas?