[Unit]
Description=A Spring Boot application
After=syslog.target

[Service]
User=[user du dossier]
ExecStart=[chemin jusqu'au .jar]

[Install]
WantedBy=multi-user.target

[(DANS : ) /etc/systemd/system]
[-rw-r--r-- 1 root root  163 nov.  22  2018 java-api.service]

[-rwxr-xr-x 1 root root 44823539 avril 18 20:17 java-api-0.1.jar]
[chmod 755 java-api-0.1.jar]