Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional

Question - 17 Maximum mark : - 29

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Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional

Your web site has many user-customizable features, for example font and color preferences on web pages. Your IT department has already built a subsystem for user preferences using Java SE's lang.util.prefs package APIs and you have been ordered to reuse this subsystem in your web application.You need to create an event listener that stores the user's Preference object when an HTTP session is created. Also, note that user identification information is stored in an HTTP cookie. Which partial listener class can accomplish this goal?

public class UserPrefLoader implements HttpSessionListener { public void sessionCreated(HttpSessionEvent se) { MyPrefsFactory myFactory = (MyPrefsFactory) se.getServletContext().getAttribute("myPrefsFactory"); User user = getUserFromCookie(se); myFactory.setThreadLocalUser(user); Preferences userPrefs = myFactory.userRoot(); se.getSession().setAttribute("prefs", userPrefs); } // more code here } ✘ public class UserPrefLoader implements SessionListener {public void sessionCreated(SessionEvent se) { MyPrefsFactory myFactory = (MyPrefsFactory) se.getContext().getAttribute("myPrefsFactory"); User user = getUserFromCookie(se); myFactory.setThreadLocalUser(user); Preferences userPrefs = myFactory.userRoot(); se.getSession().addAttribute("prefs", userPrefs); } // more code here } ✘ public class UserPrefLoader implements HttpSessionListener { public void sessionInitialized(HttpSessionEvent se) { MyPrefsFactory myFactory = (MyPrefsFactory) se.getServletContext().getAttribute("myPrefsFactory"); User user = getUserFromCookie(se); myFactory.setThreadLocalUser(user); Preferences userPrefs = myFactory.userRoot(); se.getHttpSession().setAttribute("prefs", userPrefs); } // more code here } ✘ public class UserPrefLoader implements SessionListener {public void sessionInitialized(SessionEvent se) { MyPrefsFactory myFactory = (MyPrefsFactory) se.getServletContext().getAttribute("myPrefsFactory"); User user = getUserFromCookie(se); myFactory.setThreadLocalUser(user); Preferences userPrefs = myFactory.userRoot(); se.getSession().addAttribute("prefs", userPrefs); } // more code here } ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which interface must a session attribute implement if it needs to be notified when a web container persists a session?

javax.servlet.http.HttpSessionListener ✘ javax.servlet.http.HttpSessionBindingListener ✘ javax.servlet.http.HttpSessionAttributeListener ✘ javax.servlet.http.HttpSessionActivationListener ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Given the definition of MyObject and that an instance of MyObject is bound as a session attribute: Which is true?]

Only a single instance of MyObject may exist within a session. ✘ The unbound method of the MyObject instance is called when the session to which it is bound times out. ✘ The com.example.MyObject must be declared as a servlet event listener in the web application deployment descriptor. ✘ The valueUnbound method of the MyObject instance is called when the session to which it is bound times out. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which interface must a class implement so that instances of the class are notified after any object is added to a session?

javax.servlet.http.HttpSessionListener ✘ javax.servlet.http.HttpSessionValueListener ✘ javax.servlet.http.HttpSessionBindingListener ✘ javax.servlet.http.HttpSessionAttributeListener ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Given: What code, inserted at line 21, is called prior to a session being migrated to a different JVM assuming the web application containing MyExample is deployed in a container which supports distributed applications?

public void valueUnbound(HttpSessionEvent ev) {...} ✘ public void sessionPassivated(HttpSessionEvent ev) {...} ✘ public void sessionDidActivate(HttpSessionEvent ev) {...} ✘ public void sessionWillPassivate(HttpSessionEvent ev) {...} ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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?

Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object. ✘ Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the eventobject. ✘ Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on theevent object. ✘ Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the eventobject. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

A developer for the company web site has been told that users may turn off cookie support in their browsers. What must the developer do to ensure that these customers can still use the web application?

The developer must ensure that every URL is properly encoded using the appropriate URL rewriting APIs. ✘ The developer must provide an alternate mechanism for managing sessions and abandon the Http Session mechanism entirely. ✘ The developer can ignore this issue. Web containers are required to support automatic URL rewriting when cookies are not supported. ✘ The developer must add the string ?id= to the end of every URL to ensure that the conversation with the browser can continue. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which method must be used to encode a URL passed as an argument to HttpServletResponse.sendRedirect when using URL rewriting for session tracking?

ServletResponse.encodeURL ✘ HttpServletResponse.encodeURL ✘ ServletResponse.encodeRedirectURL ✘ HttpServletResponse.encodeRedirectURL ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Given: What is the result?

true true ✘ false true ✘ false true 0 ✘ true true Infinity ✔ false true Infinity ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

A developer wants to use EL to invoke a function using ${my:bloof("foof")}. Which is always true?

The method invoked by this function must be static. ✘ The function class must implement the Function interface. ✘ The expression is NOT a valid EL expression for invoking a function. ✘ The function must be declared in a web.xml file using the element. ✔ The function class must have a method with the signature: void bloof(java.lang.Strings) ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional

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