Plugin Data Storage does not display data

Issue Summary

Plugin Data Storage does not display data

Steps to Reproduce

1. Install and set-up Confluence 7.4.5 or newer
2. Access Plugin Data Storage page via /plugins/servlet/active-objects/tables/list

Expected Results

Actual Results

All plugins name as unknown, table column as '$i.table' and rows as '$i.rows'

Workaround

Perform these steps to restore the functionality in Confluence:

1. Edit <confluence-install-dir>/confluence/WEB-INF/classes/velocity.properties
2. Replace the full line containing com.atlassian.activeobjects from the introspector.restrict.packages section with: 

    com.atlassian.activeobjects.ao,\
    com.atlassian.activeobjects.config,\
    com.atlassian.activeobjects.internal,\
    com.atlassian.activeobjects.osgi,\
    com.atlassian.activeobjects.plugin,\
    com.atlassian.activeobjects.servlet,\
    com.atlassian.activeobjects.spring,\
    com.atlassian.activeobjects.util,\ 

3. Restart Confluence

Bear in mind that these changes were made in order to limit potential template injection vulnerabilities (CONFSERVER-59898), so there are some security implications to this workaround. You might consider making this change, getting the data you need from the page, and then reverting it and restarting Confluence again.