Cronjob failing on Debian
===

I'm having no idea why my cronjob isn't executed. Here are the details:

I've a script inside /usr/src named stundenplan.sh, which executes a jar file.
The script itself works if you are running it from the console.
But trying to run it from a cronjob it doesn't work.

The script looks like this:

    #!/bin/sh
    java -jar vorlesungsplaene.jar

The jar file lies in the same directory as expected.

I defined two cronjobs:

    # m h  dom mon dow   command
      30 * * * * /usr/src/stundenplan.sh
     0-59 * * * * echo "dude" >> /tmp/test.txt

The job below works fine, writing "dude" meticulously in the test.txt file.

As you can see in the syslog, the job above fails:

    Jul 18 15:29:01 vps47327 /USR/SBIN/CRON[16361]: (root) CMD (echo "dude" >> /tmp/test.txt)
    Jul 18 15:30:01 vps47327 /USR/SBIN/CRON[16364]: (root) CMD (/usr/src/stundenplan.sh)
    Jul 18 15:30:01 vps47327 /USR/SBIN/CRON[16365]: (root) CMD (echo "dude" >> /tmp/test.txt)
    Jul 18 15:30:01 vps47327 /USR/SBIN/CRON[16363]: (CRON) error (grandchild #16364 failed with exit status 1)

Any suggestions, ideas or solutions? ;)