Our Confluence suddenly crashed and then manually start with Fatal error below:
2019-10-31 02:40:18,327 FATAL [localhost-startStop-4] [atlassian.spring.container.SpringContainerContext] getComponent Spring Application context has not been set
2019-10-31 02:40:18,330 WARN [localhost-startStop-4] [atlassian.confluence.plugin.PluginFrameworkContextListener] contextDestroyed Failed to shut down plugin system during ServletContext shutdown: Spring Application context has not been set
Once we tried to open the main page, it redirected us to the setup page.(https://<our confluence server hostname>/setup/setupstart.action)
no change has been made recently, and Confluence was working properly before crash. What is the possible reason of this error? how to fix it ?