Hi! Thanks for giving it a spin :D. When running it, did you open a terminal window on the same folder as where the jar is and run "Java -jar Codenames-1.0-SNAPSHOT.jar"?
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I didn't have the -jar argument. I tried adding -jar this time and got this output: https://pastebin.com/f1CW4Szg
Sorry for taking this long, was busy making it multiplayer so I can host it online :). Check out my comment above for being able to play it without installing the server.
In case you still want to try to run it locally, your problem was that you are likely using open jdk while we built ours using regular jdk.