A、 The init method on a filter is called the first time a servlet mapped to that filter is invoked

B、 A filter defined for a servlet must always forward control to the next resource in the filter chain.

C、 Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file

D、 If the init method on a filter throws an UnavailableException， then the container will make no further attempt to execute it