Java file does not run using crontab

Question

Command "java temp" print Hello World. but when I try to run this command using crontab it does not work.

I am using this command in crontab

*/2 * * * * /usr/bin/java -cp /home/parth/javafile/ temp

I also tried this command

*/2 * * * * root (cd /home/parth/javafile/temp.class ; java temp)

and

*/2 * * * * root /usr/bin/java -cp /home/parth/javafile/ temp

But these commands also does not work.

I also tried to create script file .sh and put java command inside script and then run that script using crontab. but that one also does not work.

I think I am doing something wrong with command but I am not getting what it is exactly.

Where are you expecting it to show "Hello World" when cron runs it? — that other guy
– that other guy, Commented Dec 8, 2016 at 21:51

Brandon White · Accepted Answer · 2016-12-08 21:55:54Z

1

The problem is, your user's shell is not running the command. The user that is running the CRON job is running the command. In this case you will never see the output printed to your terminal. One option is to redirect the output to a file, something like:

*/2 * * * * /usr/bin/java -cp /home/parth/javafile/ temp >> /path/to/log/file 2>&1

The bit at the end 2>&1 redirects Standard Error to the same location as Standard Out. That way errors print to the log file as well.

2 is the file descriptor for Standard Error

> is for redirecting output

& is the symbol for file descriptor

1 is the file descriptor for Standard Out

edited Dec 8, 2016 at 21:55

answered Dec 8, 2016 at 21:50

Brandon White

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