Note, for other users who may be looking at this in the future, I needed to install Java onto the machine running the server.
Simply run:
winget install --exact --id Oracle.JDK.19
in the terminal, then navigate to the FBDj directory, right click on the folder and select "Open in Terminal", then run the command listed above in SAS~Storebror's post.
Cheers,
sercrets