Can't get cron to open Jar file

Question

I'm running a minecraft server on ubuntu 20.04. I have a script to execute it and works fine. However i can't get it to work @reboot with cron, because it can't find the jar file. From what i researched, it seems cron doesn't run with my user (although i'm not using sudo). What are my options?

This is my crontab -e:

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 

00 01 * * * /home/eggzaile/minecraft/backup.sh 2>>&1 

@reboot sleep 45 && /usr/bin/screen -dmS minecraft sh -c '/home/eggzaile/minecraft/start.sh; exec bash' 2>>&1

after the reboot and cron kicks in, when i attach to that window...all i see is the error about not finding the jar file.

this is the script itself:

    #!/bin/sh
while true
do
java -Xms3G -Xmx3G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -jar paper-1.16.5-778.jar nogui
sleep 5
done

I red somehere that using the full path on the script should work, but that breaks it, i tried. i used (java -jar /path/to/server.jar and all the arguments here), but apparently i should not change the order.

Any tips?

Answer 1

Your bash script didn't change into the directory that contains the jar files. That's why your bash script doesn't work. But you did change directory when you started it manually.

Edit your bash script to change to the proper directory before calling java.