Running a JAVA application as a Unix Cron Job

Question

I'm trying to run a 3rd party java application on a Unix (Solaris) system. I want to run it from a script so that I can put it in the cron schedule. The problem is that it won't run as a pure batch script. It seems to really want a DISPLAY device assigned to the shell, even though it never displays anything to that device. The vendor claims that he is not using any DISPLAY functionality.
Here's my script;
#!/bin/sh
# PARAMETER 1 (%1): name (without .tif)
# PARAMETER 2 (%2): type (CAMS or MACS)
# PARAMETER 3 (%3): level (1, 2, or 3)
export myCP=./Extract.zip:lib/jai_codec.jar:lib/jai_core.jar:lib/mlibwrapper_jai.jar
export DISPLAY=(some xhost unix workstation's IP address)
java -classpath $myCP extract.ByteConvertOne $1 $2 $3 > byteconvertone.log 2>&1
If I run this script with the "export DISPLAY" in place, it runs fine. If I comment out the "export DISPLAY" line, it hangs and will never execute or error out.
Is there some other redirect, or system property setting I need to change to make this work?
Help

Answer 1

only idea is to set system wide the DISPLAY to :0
for examples in
/etc/profile :
export DISPLAY=:0
btw: AFAIK when you instantiate swing or awt classes they require an X server running and the DISPLAY variable to be set. Perhaps that is a clue, why you need this.