I'm trying to upgrade Confluence server from version 6.7.0 to 6.8.0, with the old home dir and with a new and empty home dir, and I'm getting this error:
2018-03-20 22:30:09,871 INFO [localhost-startStop-1] [com.atlassian.confluence.lifecycle] contextInitialized Starting Confluence 6.8.0 [build 7701 based on commit hash 5c86c3545b3c8f6447efaa8d89a83fb420d71987] - synchrony version 2.1.0-release-confluence_6.5-1a01ab2d
2018-03-20 22:30:12,137 WARN [localhost-startStop-1] [com.atlassian.config.ApplicationConfig] setApplicationHome Application home does not exist. Creating directory: /srv/confluence_upgrade/shared-home
2018-03-20 22:30:12,152 INFO [localhost-startStop-1] [atlassian.confluence.cluster.DefaultClusterConfigurationHelper] lambda$populateExistingClusterSetupConfig$1 Populating setup configuration if running with Cluster mode...
2018-03-20 22:30:12,160 WARN [localhost-startStop-1] [atlassian.confluence.cluster.DefaultClusterConfigurationHelper] lambda$populateExistingClusterSetupConfig$1 Could not find shared config file.
2018-03-20 22:30:14,084 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] earlyStartup Plugin system earlyStartup begun
2018-03-20 22:30:16,557 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] logTime Plugin system earlyStartup ended
2018-03-20 22:30:16,560 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] lateStartup Plugin system lateStartup begun
2018-03-20 22:30:17,922 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] logTime Plugin system lateStartup ended
2018-03-20 22:30:18,443 ERROR [localhost-startStop-1] [ContainerBase.[Standalone].[localhost].[/]] log Exception starting filter messagesDecoratorFilter
java.lang.ClassNotFoundException: com.atlassian.confluence.security.websudo.MessagesDecoratorFilter
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1335)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1163)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:542)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:523)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:264)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4708)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5348)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2018-03-20 22:30:18,464 FATAL [localhost-startStop-1] [atlassian.spring.container.SpringContainerContext] getComponent Spring Application context has not been set
2018-03-20 22:30:18,464 WARN [localhost-startStop-1] [atlassian.confluence.plugin.PluginFrameworkContextListener] contextDestroyed Failed to shut down plugin system during ServletContext shutdown: Spring Application context has not been set
2018-03-20 22:30:18,466 INFO [localhost-startStop-1] [com.atlassian.confluence.lifecycle] contextDestroyed Stopping Confluence
2018-03-20 22:30:18,501 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] shutdown Preparing to shut down the plugin system
2018-03-20 22:30:18,502 INFO [localhost-startStop-1] [atlassian.plugin.manager.DefaultPluginManager] shutdown Shutting down the plugin system
Seems error with MessagesDecoratorFilter, but it's impossible to me upgrade the installation.