Bash Script unable to run Java Program as cron job

Question

I am trying to run a .class file from a bash script every 1 minute using the crontab. I get the error Could not find or load main class Cron_Read_Send_CapacityData_To_Graphite. I have already set environment variable on my machine.

If i run the bash script from the terminal it works fine.Note the bash script and the java class file are in the same folder

Script:

$ cat Run_Cron_Read_Send_CapacityData_To_Graphite.sh
#!/bin/bash

java Cron_Read_Send_CapacityData_To_Graphite >> /home/marshell/graphite_cronjobs/Cron_Read_Send_CapacityData_To_Graphite.log

Cron entry:

$ crontab -e

*/1 * * * * /home/marshell/graphite_cronjobs/Run_Cron_Read_Send_CapacityData_To_Graphite.sh >> /home/marshell/graphite_cronjobs/debug_cronjob.log 2>&1

Error:

Error: Could not find or load main class Cron_Read_Send_CapacityData_To_Graphite

Environment variables you set in your shell init files (or in your interactive shell) may not be in effect for a shell run from cron (depending on how you set it). Try setting class path/etc. in the script explicitly. — Etan Reisner
– Etan Reisner, Commented Sep 17, 2014 at 15:28
Hi i set it in /etc/environment this is the line i added JAVA_HOME="/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java" — user3846091
– user3846091, Commented Sep 17, 2014 at 15:30
I believe /etc/environment is a pam thing and cron is likely not dealing with that either. — Etan Reisner
– Etan Reisner, Commented Sep 17, 2014 at 15:32
Yes it works if i don't use cron job. I tried running the .sh file from terminal it works fine — user3846091
– user3846091, Commented Sep 17, 2014 at 15:33

Elliott Frisch · Accepted Answer · 2014-09-17 15:36:20Z

1

You error message indicates that your classpath isn't set correctly for the script to find Cron_Read_Send_CapacityData_To_Graphite.class, I would use something like -

CP=/home/marshell/graphite_cronjobs # The classpath to use
LF=$CP/Cron_Read_Send_CapacityData_To_Graphite.log # the log file
java -cp $CP Cron_Read_Send_CapacityData_To_Graphite >> $LF

answered Sep 17, 2014 at 15:36

Elliott Frisch

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user3846091 Over a year ago

will this crontab entry start on system reboot ?

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