Server cannot find /app url after migration to 1.3 filter

[smallufo]

Hi :
I am upgrading an small project from wicket 1.2.6 to 1.3-b3
After some string replacing and package renaming , and edit web.xml ,
changing wicket servlet to wicket filter,
My resin server responses "The requested URL /app was not found on this
server."
What's left undone ?
(The included jars are : wicket-extensions.jar , wicket-ioc.jar , wicket.jar,
wicket-spring-annot.jar , wicket-spring.jar , slf4j-api-1.4.3.jar ,
slf4j-log4j.jar )

Thanks in advanced.