i have the same problem on JBoss 3.2.1/Jetty on Linux. The servlets in the .war work. But all the stylesheets and images cannot be accessed after a couple of days. There are no error-messages in the logfiles. I have to redeploy the app.
If you find a solution, please send me an mail at "olisa at gmx.net"
Jetty puts materialises the content to the /tmp directory. Linux clears the /tmp directory via some cron jobs. Move this temporary content storage to a directory that will not get cleared by cron.
You can add to JAVA_OPTS:
to move the data to /some_temp_dir.
Modify this for your requirements.
Thanks for the help, I'll give it a shot...