I guess I need to update my thread. Sorry for that

No sir, I installed Ubuntu Mate on rpi3, the java program is created in Netbeans IDE.

still getting the same error . I am new to linux, i didnt understand what the error means . Any other advice how to run the program on startup ? I tried to add the program in "Startup Application Preference" but it doesn't work.

yes I am sure that the file had been created, i looked for the javathing.service file in the /etc/systemd/system/ Here's what inside the file .. [Unit] Description=javaThing daemon service [Service] ExecStart=/usr/bin/java -jar /home/pi/Desktop/dist/DPK.jar StandardOutput=syslog StandardError=syslog...

Thanks for the reply, i tried your solution but I get this error "Failed to execute operation: Invalid argument" when i run this command "sudo systemctl enable javathing.service"

Hi, i have a java program that have a gpio controls. i can run the program in the terminal using (sudo java - jar path/to/my/program.jar). Now i want to run the program on startup .. anyone can help me ? thanks in advance. The program (with GUI) is created in Netbeans IDE Operating System installed ...

is it possible to install or connect a usb printer to my rpi ?