Scaffolding add-on failed to enable if Comala Workflow is already installed in Confluence
Summary
In atlassian-confluence.log
you would see the following error:
2017-08-16 14:32:05,046 ERROR [ThreadPoolAsyncTaskExecutor::Thread 46] [atlassian.plugin.module.PrefixDelegatingModuleFactory] createModule Detected an error (NoClassDefFoundError) instantiating the module for plugin 'com.comalatech.workflow' for module 'workflowSupplier': com/servicerocket/confluence/randombits/supplier/core/annotate/AnnotatedSupplier.
2017-08-16 14:32:05,274 ERROR [ThreadPoolAsyncTaskExecutor::Thread 46] [plugin.osgi.factory.OsgiPlugin] onPluginContainerFailed Unable to start the plugin container for plugin 'com.servicerocket.confluence.plugin.servicerocket-utility-library'
Subsequently, the Utility Library add-on would fail to enable as well.
Workaround
We're still investigating this matter however to workaround this issue, you could follow these steps:
Uninstall Comala Document Management app, Scaffolding app & Utility Library add-on
install Scaffolding app first (this also installs the Utility Library add-on)
install Comala Document Management app
The problem will not happen if the Utility Library add-on already exists on the server prior to Scaffolding add-on installation.