How to run a Java program with cron?

Question

linux

Hello,
I wrote a program, I need to run it on the crown, 1 time per day.
Here's how I did it, I
write a command
crontab -e
, it opens the vim text editor for me, in it I write the following:
00023*** java -jar /var/www/prg/programma.jar
then I press esc and enter :wq,
press enter.
Then it gives me:

no crontab for root - using an empty one
crontab: installing new crontab
"/tmp/crontab.XXXXxZHF8Z":1: bad day-of-month
errors in crontab file, can't install.
Do you want to retry the same edit?

I press Y opens the same document. When you enter N, it just closes everything to me, but as I understand it, nothing has been saved.
What am I doing wrong?
Thank you very much in advance!

Answer 1

you blew all the polymer spaces:0 23 * * * java -jar /var/www/prg/programma.jar