Use jodconverter to convert documents - in my case to pdf

http://code.google.com/p/jodconverter/

http://www.artofsolving.com/opensource/jodconverter

OO headless on Red Hat

# unset DISPLAY
# ./soffice -headless -accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard
 

How to make java scheduler...

http://www.quartz-scheduler.org/docs/cookbook/

http://www.quartz-scheduler.org/download/download-catalog.html

http://www.roseindia.net/quartz/index.shtml

http://cake.wikidot.com/quartz

http://smileybits.blogspot.com/2010/05/using-quartz.html

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http://oreilly.com/java/archive/quartz.html

http://java-source.net/open-source/job-schedulers

http://www.quartzscheduler.org/quartz/ -->> http://onjava.com/pub/a/onjava/2006/03/01/job-scheduling-in-web-application.html