Viewtracker can't be activated in your Confluence and the following log message can be found in the application log
Cannot execute atlassian-spring-scanner-runtime: plugin has an extra copy of atlassian-spring-scanner-annotation classes,
perhaps embedded inside the target plugin 'ch.bitvoodoo.confluence.plugins.viewtracker';
embedding scanner-annotations is not supported since scanner version 2.0.
Use 'mvn dependency:tree' and ensure the atlassian-spring-scanner-annotation dependency in your plugin has <scope>provided</scope>,
not 'runtime' or 'compile', and you have NO dependency on atlassian-spring-scanner-runtime
There are two possible causes with different resolutions.
A third party app delivers a misconfigured and old set of Spring Scanner classes and stops Viewtracker from functioning. For example Tooltip for Confluence (below version 1.2.7). An issue with Atlassian can be found on SCANNER-2170. Other possible apps and a full description of this behaviour are listed on CONFSERVER-55916.
Deactivate or uninstall the app delivering old Spring Scanner classes:
Deactivate, uninstall or update* the app causing the issue
* If an update with new Spring Scanner class is available
There is an old version of the Viewtracker loaded in Java.
Please follow these steps:
Clear the plugin cache
(Optional for logging) Remove or rename the latest logs within <Confluence Home>/logs/
Install the latest compatible version of Viewtracker