Calling a Java file from Crontab

on

 Requirement

Execute a Java file every 2 minutes

You alreay have a Java file which resides in a directory called " /home/jjj/bridge/heartbeat/" and which you can execute from the command line with:

java -classpath /home/jjj/bridge/heartbeat/ojdbc6.jar:. hb_bridge_util_mem_usage

 

Solution

Create a shell script

#!/bin/bash

java -classpath /home/jjj/bridge/heartbeat/ojdbc6.jar:. hb_bridge_util_mem_usage
 

Create a cronjob

crontab -e

*/2 * * * * (cd /home/jjj/bridge/heartbeat/; ./hb_bridge_util_mem_usage.sh)

 

Debugging

When I had issues with the syntax, the cron job would send an email


Open the message with

mail

read the latest email with "1" (i.e message 1)

I had a lot of email - as the job was running every 2 minutes and failing...

delete *

Quit with

q

 Acknowledgement

https://unix.stackexchange.com/questions/98914/how-to-use-crontab-for-a-java-file-in-linux

https://apple.stackexchange.com/questions/28745/how-do-i-delete-all-terminal-mail


 

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