Do you have any directories that get cleared automatically by the Windows scheduler. Basically i have seen some issues here where the tempdir used by Jetty gets removed by some sort of cron jobs in *nix based systems.
Maybe you can make the tempdir point to a location that wont get deleted automatically?
I dont believe I have any background processes running besides the app server and the database server.
the Jboss server is installed as a Windows Service using a wrapper from Tanukisoftware.com
WOuld this have anything to do with the problem?
Also where does Jetty create the tmp directory by default. It should be default cause I didnt cahnge any configuration for jetty,