不是必报，报异常的概率不是很大
Sorry, system error occurred.
This page is sloan default setting.
If you would like to use Application Original pgae.
It is necessary to override FWWebApplication#getRequestCycleListener() and create new FWRequestCycleListener's Sub Class.
StackTrace :
org.apache.wicket.core.request.mapper.StalePageException
