Symptoms

Team Calendars for Confluence, and possibly other plugins, may not be able to be enabled.

In the case of Team Calendars for Confluence, the following appears in the atlassian-confluence.log:

2014-11-03 17:10:46,890 ERROR [Spring executor 18] [extender.internal.activator.ContextLoaderListener] onOsgiApplicationEvent Application context refresh failed (NonValidatingOsgiBundleXmlApplicationContext(bundle=com.atlassian.confluence.extra.team-calendars, config=osgibundle:/META-INF/spring/*.xml))
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myWorkIntegration' defined in URL [bundle://165.0:0/META-INF/spring/spring-components.xml]: Invocation of init method failed; nested exception is java.lang.ClassCastException: com.atlassian.upm.license.internal.event.PluginLicenseEventPublisherImpl cannot be cast to com.atlassian.upm.api.license.PluginLicenseEventRegistry

Diagnosis

Check to see if the plugin "Atlassian Universal Plugin Manager - Plugin License Storage Plugin" is installed in the instance:

Atlassian Universal Plugin Manager - Plugin License Storage plugin (com.atlassian.upm.plugin-license-storage-plugin, Version: 2.11, Installed: Oct 24, 2014)

Cause

Before version 2.0.1 of the UPM, a separate plugin was required to manage license functions for purchased addons. In later versions of the UPM, this functionality has been included, and this additional plugin is not required.

Additionally, it may be required to ensure that the UPM is at its latest version. See Updating the Universal Plugin Manager for more information.

Resolution

• Uninstall or Disable the Plugin License Storage Plugin; and then try to enable Team Calendars for Confluence again.

  • If you're having difficulties removing Plugin License Storage Plugin plugin via the administration console, refer to our guide on How to manually remove malfunctioning add-ons

  • If you do remove it from the database, be sure to clear the Confluence Plugins Cache before restarting Confluence