public interface BehaviorListener extends FacesListener
A generic base interface for event 
 listeners for various types of BehaviorEvents.  All listener 
 interfaces for specific BehaviorEvent event types must 
 extend this interface.
Implementations of this interface must have a zero-args public
 constructor.  If the class that implements this interface has state
 that needs to be saved and restored between requests, the class must
 also implement StateHolder.
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