Unable to enable Team Calendars for Confluence with the error "Configuration problem: Unable to locate Spring NamespaceHandler for XML schema"
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Problem
The plugin, Team Calendars for Confluence, is unable to be enabled from the Add-On Manager in Confluence Admin. This typically occurs after a plugin update.
The following appears in the atlassian-confluence.log:
ERROR [ThreadPoolAsyncTaskExecutor::Thread 39] [extender.internal.activator.ContextLoaderListener] onOsgiApplicationEvent Application context refresh failed (NonValidatingOsgiBundleXmlApplicationContext(bundle=com.atlassian.confluence.extra.team-calendars, config=osgibundle:/META-INF/spring/*.xml))
– referer: http://localhost:8090/confluence/plugins/servlet/upm | url: /rest/plugins/1.0/com.atlassian.confluence.extra.team-calendars-key | userName: admin
org.springframework.beans.factory.parsing.BeanDefinitionParsingException:
Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace http://www.springframework.org/schema/context
Offending resource: URL [bundle://219.0:0/META-INF/spring/spring-components.xml]Cause
The plugin is trying to load a resource that has somehow been corrupted in the cache.
Resolution
Try to Clear the plugin cache, so that the plugins are forced to load these resources directly from the .jar files