Is it possible to run Raspbian Stretch on the Pi 4?
The problem is that the newest released (Raspbian Buster) has some weird bug in which JavaFX applications cannot be started with the error : "*failed to add service - already in use?"
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I know of no reason why stretch couldn't work.
Nobody seems to have bothered to get it to work so you will have to do the heavy lifting yourself.
I would start by trying to find out why the Foundation chose to use Buster as the base for the Pi4. If there is a show-stopper re stretch they should know.
Stretch cannot run on the Pi 4; the foundation timed the release of the Pi 4 with the release of Buster to save money.
But... I have just released a script that will run a Raspbian Stretch virtual machine, inside the Raspbian Buster operating system. Not sure if it's helpful in your case, but definitely something to try.