Often, on startup or on Add-on update Confluence has errors with Add-Ons that have versions that clash with each other. This often causes issues for customers and support tickets.
Please also see related bug
In atlassian-confluence.log we can see errors like
Another example is when running version 4 of ScriptRunner and upgrading to version 5.
Only clearing the plugin cache does not always resolve this issue.
Have better version checks in the plugin loader for incompatible versions.
This is documented here for the ScriptRunner issue
For other plugins, remove the plugin from the database directly
- Shutdown Confluence
- Check the logs and query the database to determine the correct plugin to remove
- Remove the plugin from the database
- Update bandana table (if required)
- Clear the plugin cache
- Restart Confluence
This is a related bug