Anyone know where to put this code at during start-up?

[Brian Johnson]

-Djira.downgrade.allowed=true
I have no idea of where to put this code at? Is it in the database or what?

We have different database versions and need to rollback from 8.05 to 7.5

[Nic Brough -Adaptavist-]

Look in the setenv.sh or setenv.bat file (depending on your operating system), in <jira install>/bin

However, also be aware that while that the flag can attempt to trigger a downgrade, it rarely does what people seem to guess it might. 

It will check to see if a downgrade might be possible and execute it if it can.  This

• really only works for minor changes of version where the database has not changed shape.  8.0.5 back to 8.0.0 might work, but there is zero possibilty that 8.0.5 to 7.anything will not just fail (on a good day - on a bad one, it will probably render your database corrupt beyond repair)
• takes no account of any apps you have installed, even Atlassian ones.  There's no way to know what they may do when you use the flag