1Z0-899 Exam Dumps | When using the @WebListener annotation, the class on which the annotation is applied to must also implement

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Java EE 6 Web Component Developer Certified Expert Exam
Oracle.1z0-899.v2018-04-11.q100
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Question 23/100

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

Correct Answer: C,D

Explanation/Reference:
@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.

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