[Unit]
Description=Minecraft server
Documentation=
Wants=network.target
After=network.target

[Service]
WorkingDirectory=/home/minecraft/server
User=minecraft
Group=minecraft
Type=forking
# Run it as a non-root user in a specific directory

ExecStart=/usr/bin/tmux -s new minecraft "java -jar server.jar"

# Send "stop" to the Minecraft server console
ExecStop=/usr/bin/tmux kill-session -t minecraft
# Wait for the PID to die - otherwise it is killed after this command finishes!
ExecStop=/bin/bash -c "while ps -p $MAINPID > /dev/null; do /bin/sleep 1; done"
# Note that absolute paths for all executables are required!

[Install]
WantedBy=multi-user.target