Missing log file

Question

I wrote a .jar file that is supposed to be run once a day that interacts with Google App Engine. When I run it from the computer, it runs just fine and creates a logfile that details some statistics. I transferred it over to the Raspberry Pi and it runs via crontab.

The first time I ran it, I got a permission denied in syslog. I read that using 'sudo crontab -e' would fix that. Now I no longer get the error but my logfile doesn't appear.

Here is the portion of the code that is to create the logfile:

        PrintWriter writer = new PrintWriter("log" + format.format(date) + ".txt");
        writer.println("Total Themes: " + numThemes + "\r\n");
        writer.println("Active Themes: " + numActiveThemes + "\r\n");
        writer.println("Inactive Themes: " + numInactiveThemes + "\r\n");
        writer.println("Total Sales: " + numSales + "\r\n");
        writer.println("Total Price Changes: " + numPriceChanges + "\r\n");
        writer.println("Total Time: " + seconds + " seconds" + "\r\n");
        writer.close();

Crontab:

0 2 * * * java -jar /mnt/data/scripts/test.jar

What am I missing about the switch from Windows that is preventing the creation of the logfile?

Edit: I can run the .jar file manually (using sudo) and the logfile is created. Not working w/cron though.

Edit2: /etc/log/syslog has:

Feb  8 21:46:01 raspberrypi /USR/SBIN/CRON[10841]: (root) CMD (java -jar /mnt/data/scripts/updater_pricing.jar

Edit 3: Changed permissions of the folder and jar to 777 (as a test). Now I can run the file w/o 'sudo' (expected). Tried running a regular cron task using the same cron expression as above. Now syslog has:

Feb  9 07:55:01 raspberrypi /USR/SBIN/CRON[13292]: (pi) CMD (/usr/bin/java -jar /mnt/data/scripts/test.jar)

It also has: Feb 9 07:55:59 raspberrypi /USR/SBIN/CRON[13291]: (CRON) info (No MTA installed, discarding output)

Perhaps I can add something that will output the error message?

Answer 1

Figured it out thanks to the pointers from @Jacobm001. The email was being sent because I had some lines of System.out.println()

The logfiles were being created, just in the wrong place. I had to modify the original file line to be:

PrintWriter writer = new PrintWriter("/mnt/data/scripts/" + "log" + format.format(date) + ".txt");