Initially i call the a4j:poll to pull a list of name from the action. But if there is exception occur during the half way of the poll, then the list will not show up. Then i have to press the F5 button to refresh the page then it shows up. It seems like the data was in the session, but the exception cause the a4j:poll cannot reRender the list to show up. Has anyone there experience this before ? any solution for this...thanks..