problem with weblogic static timer

Question

hi all

i have written a JSF project. in my project i am using some java timers in my backbean

private static List<PollerTimerTask> tasksList;

every things work fine, but when i am changing my project and redeploy it by ANT

the active timers continue to work but my static field is become null.

what is wrong? how can i fix this?

i am using weblogic application server and my back bean scope is application