Before you can jack-in, you need to install REBL, a experimental tool developed by cognitect.
You can download REBL here. Once downloaded follow the enclosed instructions to install corresponding libraries into your local maven cache.
For the jdbc part to work you need the chinook.db in your resources path.
For the xtdb part to work you need to first run the code in xtdb-chinook (ingesting chinook into xt) and create a symbolic link from the database to root of this repo.
ln -s /path/to/xtdb-chinook/data xtdb-chinook