Dashboard is not rendering properly
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
Problem
Confluence dashboard is not rendering properly. Here is how it looks:
And the following appears in the atlassian-confluence.log:
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2014-12-24 15:05:44,092 ERROR [main] [atlassian.event.internal.AsynchronousAbleEventDispatcher] run There was an exception thrown trying to dispatch event 'com.atlassian.plugin.event.events.PluginFrameworkStartingEvent@1cab19e2' from the invoker 'SingleParameterMethodListenerInvoker{method=public void com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager.onStart(com.atlassian.plugin.event.events.PluginFrameworkStartingEvent), listener=com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager@4ef2ab73}'.
java.lang.RuntimeException: java.util.ArrayList cannot be cast to [Ljava.lang.Class;
at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:54)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:66)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:32)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:60)
at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:152)
at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:71)
..
Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to [Ljava.lang.Class;
at com.atlassian.plugin.spring.SpringHostComponentProviderFactoryBean$SpringHostComponentProvider.provideBeans(SpringHostComponentProviderFactoryBean.java:153)
at com.atlassian.plugin.spring.SpringHostComponentProviderFactoryBean$SpringHostComponentProvider.provide(SpringHostComponentProviderFactoryBean.java:122)
at com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager.collectHostComponents(FelixOsgiContainerManager.java:482)
at com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager.start(FelixOsgiContainerManager.java:241)
at com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager.onStart(FelixOsgiContainerManager.java:203)
Cause
This can be possibly caused by using an unsupported version of Java.
Resolution
Make sure that you are running your confluence instance on a supported version of Java according to our documentation on Supported Platforms.
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