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Question ID 4707

Given the definition of Myobject and that an instance of Myobject is bound as a session attribute:
8.    package com.example;
9.    public class Myobject implements
10.    javax.servlet.http.HttpSessionBindingListener {
11.    // class body code here
12.    }
Which is true?
 

Option A

A.    Only a single instance of Myobject may exist within a session
 

Option B

B.    The unbound method of the Myobject instance is called when the session to which it is bound times out
 

Option C

C.    The com.example.MyObject must be declared as a servlet event listener in the web application deployment descriptor
 

Option D

D.    The valueUnbound method of the Myobject instance is called when the session to which it is bound times out
 

Correct Answer D
Explanation


Question ID 4708

Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?
 

Option A

A.    Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
 

Option B

B.    Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
 

Option C

C.    Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
 

Option D

D.    Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
 

Correct Answer B
Explanation

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