Error related to zero downtime support during upgrade

[Martin McCann]

Hello
I am upgrading Jira Sottware from 7.13.12 to 8.5.4  (to the latest Enterprise Release)

- performed backups
- download atlassian-jira-software_x64.binn  for Linux  (version 8.5.4)
- performed upgrade
- reinstated config changes into the new version (server.xml, setenv.sh, catalina.sh etc)
- start-jira.sh

  I tail the log and see this exception below that Jira cannot start...  (see Result)
  in /opt/atlassian/jira/software/application-data/jira/log/atlassian-jira.log
  PLEASE ADVISE ON WHAT ACTION I CAN TAKE.? Do I need to revert back to pre-upgrade
  snapshots and upgrade again or is there a workaround...

 Thank you /Martin
 
 Result:

2020-04-09 07:17:34,868-0400 localhost-startStop-1 ERROR [c.a.jira.startup.LauncherContextListener] Unable to start JIRA.
java.lang.IllegalStateException: Your node with Jira version 8.5.4 will not start up with version 7.13.12 because Jira does not support zero downtime upgrades between major releases. See https://docs.atlassian.com/jira/jadm-docs-080/Upgrading+Jira+applications.
at com.atlassian.jira.startup.ClusterNodeVersionCheckLauncher.verifyMajorVersion(ClusterNodeVersionCheckLauncher.java:85)
at com.atlassian.jira.startup.ClusterNodeVersionCheckLauncher.start(ClusterNodeVersionCheckLauncher.java:71)
at com.atlassian.jira.startup.DefaultJiraLauncher.lambda$postDbLaunch$2(DefaultJiraLauncher.java:144)
at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrEnqueue(DatabaseConfigurationManagerImpl.java:301)
at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrWhenDatabaseActivated(DatabaseConfigurationManagerImpl.java:196)
at com.atlassian.jira.startup.DefaultJiraLauncher.postDbLaunch(DefaultJiraLauncher.java:137)
at com.atlassian.jira.startup.DefaultJiraLauncher.lambda$start$0(DefaultJiraLauncher.java:104)
at com.atlassian.jira.util.devspeed.JiraDevSpeedTimer.run(JiraDevSpeedTimer.java:31)
at com.atlassian.jira.startup.DefaultJiraLauncher.start(DefaultJiraLauncher.java:102)
at com.atlassian.jira.startup.LauncherContextListener.initSlowStuff(LauncherContextListener.java:154)
at com.atlassian.jira.startup.LauncherContextListener.initSlowStuffInBackground(LauncherContextListener.java:139)
at com.atlassian.jira.startup.LauncherContextListener.contextInitialized(LauncherContextListener.java:101)
... 5 filtered

[Nic Brough -Adaptavist-]

Administration -> General Configuration

Click edit and change the "Introduction" section.