Confluence Will Not Update or Install Add-ons
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
Confluence starts and seems to operate normally except when trying to install or update add-ons.
The following appears in the atlassian-confluence.log:
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ERROR [ThreadPoolAsyncTaskExecutor::Thread 8] [plugin.osgi.factory.OsgiPlugin] onPluginContainerFailed Unable to start the plugin container for plugin com.atlassian.activeobjects.activeobjects-plugin
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'handler' defined in URL [bundle://29.0:0/META-INF/spring/web-context.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/ServletContext Cause
This is caused by incompatibility with Tomcat 7. Please make sure your Confluence version is using Supported Platforms.
Resolution
Install Apache Tomcat 6, or use the Atlassian supplied 'std' or standalone version of Confluence
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