Problems with plugins (apps) after Confluence upgrade due to plugin cache

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If you experience issues with plugins (apps) in Atlassian Confluence after an upgrade, the problem could simply be caused by an old cache.

Symptoms are that updating or installing a plugin doesn't work and the plugin will stay disabled (greyed out).

An error such as the following is then shown in the atlassian-confluence.log:

2021-09-07 10:47:08,172 ERROR [ThreadPoolAsyncTaskExecutor::Thread 55] [plugin.osgi.factory.OsgiPlugin] onPluginContainerFailed Unable to start the plugin container for plugin 'com.atlassian.troubleshooting.plugin-confluence'
 -- url: /confluence/rest/plugins/1.0/ | referer: | traceId: 74f0243fc43e24a5 | userName: admin
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from URL [bundle://325.0:0/META-INF/spring/spring-context.xml]; nested exception is java.lang.IllegalStateException: The bundle is uninstalled.

To solve this, the plugin cache needs to be cleared.

1. Stop Confluence

root@confluence:~# /etc/init.d/confluence stop

2. Change into the CONFLUENCE_HOME directory (default: /var/atlassian/application-data/confluence)

root@confluence:~# cd /var/atlassian/application-data/confluence

3. Backup the plugin cache directories (e.g. to /tmp):

root@confluence:/var/atlassian/application-data/confluence# mkdir /tmp/plugins-cache-backup
root@confluence:/var/atlassian/application-data/confluence# cp -Rp bundled-plugins/ plugins-cache/ plugins-osgi-cache/ plugins-temp/ /tmp/plugins-cache-backup/

4. Remove the plugin cache directories:

root@confluence:/var/atlassian/application-data/confluence# rm -rf bundled-plugins/ plugins-cache/ plugins-osgi-cache/ plugins-temp/

5. Start Confluence

root@confluence:~# /etc/init.d/confluence start

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