单选题Your web application requires the adding and deleting of many session attributes during a complex usecase. A bug report has come in that indicates that an important session attribute is being deleted too soonand a NullPointerException is being thrown several interactions after the fact. You have decided to create asession event listener that will log when attributes are being deleted so you can track down when theattribute is erroneously being deleted. Which listener class will accomplish this debugging goal？（）ACreate an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.BCreate an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.CCreate an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.DCreate an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
单选题
Your web application requires the adding and deleting of many session attributes during a complex usecase. A bug report has come in that indicates that an important session attribute is being deleted too soonand a NullPointerException is being thrown several interactions after the fact. You have decided to create asession event listener that will log when attributes are being deleted so you can track down when theattribute is erroneously being deleted. Which listener class will accomplish this debugging goal？（）
A
Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
B
Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
C
Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
D
Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
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A developer is designing the presentation tier for a web application that relies on a complex session bean.The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the sessionbean API directly impacts the development of the presentation tier. Which design pattern provides a meansto manage the uncertainty in the API？（）A、View HelperB、Front ControllerC、Composite ViewD、Intercepting FilterE、Business Delegate
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单选题A developer is designing the presentation tier for a web application that relies on a complex session bean.The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the sessionbean API directly impacts the development of the presentation tier. Which design pattern provides a meansto manage the uncertainty in the API？（）AView HelperBFront ControllerCComposite ViewDIntercepting FilterEBusiness Delegate
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