Inappropriate error message displayed when xwork plugin action can't be instantiated

If an xwork plugin action can't be instantiated, for whatever reason, the ConfluencePluginObjectFatory passes all exceptions through to xwork. Xwork then catches the exception, and throws an IllegalArgumentException, with no reference to the original exception, not even passing it as the cause:

java.lang.IllegalArgumentException: Method 'doDefault()' is not defined in action 'class com.atlassian.studio.confluence.themes.sidebar.ConfigureSidebarAction'

There are no errors in the logs to indicate that the cause is that the plugin class couldn't be instantiated, and certainly nothing saying why it can't be instantiated. I suggest that the ConfluencePluginObjectFactory catches and logs any exceptions thrown when instantiating the plugin action.