When using the @WebListener annotation, the class on which the annotation is applied to must also implement at least one o the following interfaces – (Choose two):

When using the @WebListener annotation, the class on which the annotation is applied to must
also implement at least one o the following interfaces – (Choose two):

A.
RequestListener

B.
AttributeListener

C.
ServletContextListener

D.
HttpSessionListener

E.
SessionAttributeListener

F.
AsyncListener

Explanation:
@WebListener
The main task of the listener is to listen the particular events and process your own task on that
event. For example, if you want to initialize a database connection before your application starts,
ServletContextListener will be implemented to do that. Another good example is -when you want
to do some task on the creation and destruction of a session. For this purpose you need to
implement HttpSessionListener.