linux - Debugging crontab jobs
I have added a crontab entry on a Linux server that will run a Java executable. The Java code uses its own class for logging errors and messages into a log file.

You can enable logging for cron jobs in order to track problems. You need to edit the /etc/rsyslog.conf or /etc/rsyslog.d/50-default.conf (on Ubuntu) file and make sure you have the following line uncommented or add it if it is missing:
cron.*                         /var/log/cron.log

Then restart rsyslog and cron:
sudo service rsyslog restart
sudo service cron restart

Cron jobs will log to /var/log/cron.log.
