無年度 - Java EE 6 Web Component Developer Certified Expert Exam：1z0-899(51-100)#84004

選擇題 (48)

51 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? (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.

52 You have a use in your web application that adds several session-scoped attributes. At the end of the use case, one of these objects, the manage attribute, is removed and then it needs to decide which of the other session-scoped attributes to remove. How can this goal be accomplished? (A) The object of the manager attribute should implement the HttpSessionBindingListener and it should call the removeAttribute method on the appropriate session attributes. (B) The object of the manager attribute should implement the HttpSessionListenar and it should call the removeAttribute method on the appropriate session attributes. (C) The object of the manager attribute should implement the HttpSessionBindingListener rind it should call the deleteAttribute method on the appropriate session attributes. (D) The object of the manager attribute should implement the HttpsessionListener and it should call the deleteAttribute method on the appropriate session attributes.

53 A JSP includes computations that might cause an exception. Scripting is not permitted by your IT Certification Guaranteed, The Easy Way! 21 company coding standards. You do not want the user to see an exception stack trace. What should you do? (A) Include a page directive at the top of the page indicating a JSP that is to be used when the exception arises. (B) Include an isError tag surrounding the JSP elements that might cause the exception. (C) Include a try/catch block surrounding the JSP elements that might cause the exception. (D) Nothing is needed, JSP pages handle exceptions cleanly. (E) Include a handler for this exception in the standard error handling page.

複選題
54 Given the annotation for MyServlet: @WebServlet{"/abc") @ServletSecurity (value=@HttpConstraint) public class Myservlet extends Httpservlet { Which two are true? (Choose two) (A) No protection of user data must be performed by the transport. (B) All user data must be encrypted by the transport. (C) Access is to be denied independent of authentication state and identity. (D) Only authenticated users are to be permitted. (E) Access is to be permitted independent of authentication state and identity.

55 A servlet wishes to indicate that it is unable to initialize at the present time, but that the initialization might succeed at some future time. Which is true? (A) This cannot be expressed. A servlet either initializes correctly or fails. (B) This expression is not necessary. If a servlet fails to initialize, the container will try again later each time a request is received that attempts to invoke that servlet. (C) The servlet should delay until it is ready to complete initialization successfully. (D) The servlet should throw an UnavailableException (E) The servlet should throw a servletException

56 Assume a JavaBean com.example.GradedTestBean exists and has two attributes. The attribute name of type java.lang.string and the attribute score is of type jave.lang.Integer. An array of com.example.GradedTestBean objects is exposed to the page in a request-scoped attribute called results. Additionally, an empty java.util.HashMap called resultMap is placed in the page scope. A JSP page needs to add the first entry in results to resultMap, storing the name attribute of the bean as the key and the score attribute of the bean as the value. Which code snippet of JSTL code satisfies this requirement? (A) ${resultMap[results[0].name] = results[0].score} (B) ＜c:set var="${resultMap}" key="{results[0].name}"value="${results[0].score}" /＞ (C) ＜c:set var="resultMap" property="${results[0].name}"＞${results[0].value}＜/c:set＞ (D) ＜c:set var="resultMap" property="${results[0].name}"＞value="${results[0].score}" /＞ IT Certification Guaranteed, The Easy Way! 22 (E) ＜c:set target="${resultMap}" property="${results[0].name}"＞value="${results[0].score}" /＞

複選題
57 In a jsp-centric shopping cart application cart application to move a client's home address of Customer object into the shipping address of the order object. The address data is stored in a value object class called Address with properties for: street address, city, province, country, and postal code. Which two code snippets can be used to accomplish this goal? (Choose two.) (A) ＜c:set var='order' property='shipAddress'value='${client.homeAddress}' /＞ (B) ＜c:set target='${order}' property='shipAddress'value='${client.homeAddress}' /＞ (C) ＜jsp:setProperty name='${order}' property='shipAddress'value='${client.homeAddress}' /＞ (D) ＜c:set var='order' property='shipAddress'＞＜jsp:getProperty name='client' property='homeAddress ' /＞＜/c:store＞ (E) ＜c:set target='${order}' property='shipAddress'＞＜jsp:getProperty name='client' property='homeAddress' /＞＜/c:set＞ F. ＜c:setProperty name='${order}' property='shipAddress'＞＜jsp:getProperty name='client' property='homeAddress' /＞＜/c:setProperty＞

59 Which interface must a session attribute implement if it needs to be notified when a web container persists a session? (A) javax.servlet.http.HttpSessionListener (B) javax.servlet.http.HttpSesssionBindindgListener (C) javax.servlet.http.HttpSessionAttributeListener (D) javax.servlet.http.HttpSessionActivationListener

60 A web application wants to register a new servlet at runtime using one of the servletContext.addServlet methods. In the implementation of which method is it legal to perform this operation? (A) AsyncListner.oncomplete (B) Servlet.init (C) ServletContextListener.contextInitialize (D) ServletrequestListener.contextInitialize

複選題
61 Your web application requires the ability to load and remove web files dynamically to the web container's file system? Which two HTTP methods are used to perform these actions? (Choose two) (A) PUT (B) POST (C) SEND (D) DELETE (E) REMOVE F. DESTROY

62 Which is a valid value for the enum EmptyRoleSemantic in Javax.servlet.annotation.ServletSecurity? (A) ADMIT (B) PERMIT (C) EXCLUDE (D) DENYALL (E) ALLOWALL

63 You are building a web application with a scheduling component. On the JSP, you need to show the current date, the date of the previous week, and the date of the next week. To help you present this information, you have created the following EL functions in the 'd' namespace: * Name : curData; signature: java.util.utilDate CurrentDate() * Name : curData; signature: java.util.utilDate addweek (java.util.Date, int) * Name: dateString; signature: java.util.String getDataString (jave.util.Data) Which EL code snippet will generate the string for the previous week? (A) ${d:dateString(affWeek(curDate(), -1)) } (B) ${d:dateString [addWeek[curDate[], - ]] } (C) ${d:dateString [d:addWeek[d:curDate[], - 1]] } (D) ${d:dateString (d:addWeek(d:curDate(), -1)) }

65 Given a jar file packaged with three web fragments with names X, Y and Z respectively. Which of the following deployment descriptor, web.xml, snippets correspond to the web fragment processing orders of X, Y, Z? (i) ＜absolute-ordering＞＜name＞X＜/name＞＜name＞Y＜/name＞＜name＞Z＜/name＞＜/absolute-ordering＞ (ii) ＜absolute-ordering＞＜name＞X＜/name＞＜name＞Y＜/name＞＜/absolute-ordering＞ (iii) ＜absolute-ordering＞＜/others＞＜name＞Y＜/name＞＜name＞Z＜/name＞＜/absolute-ordering＞ (iv) ＜absolute-ordering＞＜name＞X＜/name＞＜/others＞＜name＞Z＜/name＞＜/absolute-ordering＞ (v) ＜absolute-ordering＞＜name＞X＜/name＞＜name＞Y＜/name＞＜/others＞＜/absolute-ordering＞ (A) (i) only (B) (i) and (ii) (C) (i) and (iv) (D) (i), (iii), (iv) and (v)

複選題
66 A session-scoped attribute is stored by a servlet, and then servlet forwards to a JSP page. Which three jsp:useBean attributes must be used to access this attribute in the JSP page? (Choose IT Certification Guaranteed, The Easy Way! 25 three.) (A) id (B) name (C) bean (D) type (E) scope F. beanName

複選題
67 The Squeaky Beans Inc. shopping application was initially developed for a non-distributed environment. The company recently purchased the Acme Application Server, which supports distributed Httpsession objects. When deploying the application to the server, the doployer marks it as distributable in the web application deployment descriptor to take advantage of this feature. Given this scenario, which two must be true? (Choose two) (A) The J2EE web container must support migration of objects that implement serializable. (B) The J2EE web container must use the native JVM Serialization mechanism for distributing HttpSesaion objects. (C) As per the specification, the J2EE web container ensures that distributed Httpsassion objects will be stored in a database. (D) Storing references to Enterprise JavaBeans components in the HttpSession object might NOT supported by J2EE web contain.

68 Given an EL function declared with: Which two are true? (Choose two) (A) The function method must have the signature:public String spin(). (B) The method must be mapped to the logical name "spin" in the web.xml file. (C) The function method must have the signature:public String spinIt(). (D) The function method must have the signature:public static String spin(). (E) The function method must have the signature:public static String spinIt().

70 Which of the following annotations relate to security in a servlet? (i) @WebSecurity (ii) @RolesAllowed (iii) @WebConstraint (iv) @HttpConstraint (v) @Servletsecurity (A) (i) only (B) (i) and (iii) (C) (iv) and (v) (D) (iii) and (v) (E) (ii) and (iv)

71 A web application for business expense reporting allows uploading expense receipts. Multiple receipts can be uploaded single step using one HTTP request. The servlet that processes the request has been marked with the @MultipartConfig annotation. Which method should the servlet use to access the uploaded files? (A) HttpServletRequest.getParts() (B) HttpServletRequest.getData() IT Certification Guaranteed, The Easy Way! 27 (C) servletRequest.getParts() (D) servletRequest.getAllParts()

複選題
Explanation The request.getParts() method returns collections of all Part objects. If you have more than one input of type file, multiple Part objects are returned. Since Part objects are named, the getPart(String name) method can be used to access a particular Part. Alternatively, the getParts() method, which returns an Iterable＜Part＞, can be used to get an Iterator over all the Part objects.

72 Refer to the Exhibit.

A servlet sets a session-scoped attribute product with an instance of com.example.product an forward to a JSP. Which two output the name of the product in the response? (Choose two)

(A) ＜%= product.getName() %＞ IT Certification Guaranteed, The Easy Way! 28

(B) ＜jsp:useBean id="product" class="com.example.Product" /＞＜%= product.getName() %＞

(D) ＜jsp:useBean id="product" type="com.example.Product"scope="page" /＞＜%= product.getName() %＞ (E) ＜jsp:useBean id="product" type="com.example.Product"＞＜%= product.getName() %＞＜/jsp:useBean＞

73 Click the Exhibit button. Given the HTML form: 1. ＜html＞ 2. ＜body＞ 3. ＜form action="submit.jsp"＞ 4. Name: ＜input type="text" name="i1"＞＜br＞ 5. Price: ＜input type="text" name="i2"＞＜br＞ 6. ＜input type="submit"＞ 7. ＜/form＞ 8. ＜/body＞ 9. ＜/html＞ Assume the product attribute does NOT yet exist in any scope. Which code snippet, in submit.jsp, instantiates an instance of com.example.Product that contains the results of the form submission?

(A) ＜jsp:useBean id="com.example.Product" /＞＜jsp:setProperty name="product" property="*" /＞

(B) ＜jsp:useBean id="product" class="com.example.Product" /＞${product.name = param.i1}${product.price = param.i2}

(C) ＜jsp:useBean id="product" class="com.example.Product"＞＜jsp:setProperty name="product" property="name"param="i1" /＞＜jsp:setProperty name="product" property="price"param="i2" /＞＜/jsp:useBean＞

(D) ＜jsp:useBean id="product" type="com.example.Product"＞＜jsp:setProperty name="product" property="name"value="＜%= request.getParameter( "i1" ) %＞" /＞＜jsp:setProperty name="product" property="price"value="＜%= request.getParameter( "i2" ) %＞" /＞＜/jsp:useBean＞

74 You are creating a JSP page to display a collection of data. This data can be displayed in several different ways so the architect on your project decided to create a generic servlet that generates a comma delimited string so that various pages can render the data in different ways. This servlet takes on request parameter: objoctID Assume that this servlet is mapped to the URL pattern: /WEB-INF/data. In the JSP you are creating, you need to split this string into its elements separated by commas and generate an HTML ＜ul＞ list from the data. Which JSTL code snippet will accomplish this goal? (A)＜c:import varReader='dataString' url='/WEB-INF/data'＞＜c:param name='objectID' value='${currentOID}' /＞＜/c:import＞＜ul＞＜c:forTokens items'${dataString.split(",")}' var='item'＞＜li＞ ${item}＜/li＞＜/c:forTokens＞＜/ul＞ (B)＜c:import varReader='dataString' url='/WEB-INF/data'＞＜c:param name='objectID' value='${currentOID}' /＞＜/c:import＞＜ul＞＜c:forTokens items'${dataString}' delims=',' var='item'＞＜li＞${item}＜/li＞＜/c:forTokens＞＜/ul＞ (C)＜c:import var='dataString' url='/WEB-INF/data'＞＜c:param name='objectID' value='${currentOID}' /＞＜/c:import＞＜ul＞＜c:forTokens items'${dataString.split(",")}' var='item'＞＜li＞${item}＜/li＞＜/c:forTokens＞＜/ul＞ (D)＜c:import var='dataString' url='/WEB-INF/data'＞＜c:param name='objectID' value='${currentOID}' /＞＜/c:import＞＜ul＞＜c:forTokens items'${dataString}' delims=',' var='item'＞＜li＞${item}＜/li＞＜/c:forTokens＞＜/ul＞

75 A developer wants to make a name attribute available to all servlets associated with a particular user, across multiple requests from that user, from the same browser instance. Which two provide this capability from within a tag handler? (Choose two) (A) pageContext.setAttribute("name", theValue); (B) pageContext.setAttribute("name", getSession() ); (C) pageContext.getRequest().setAttribute("name", theValue); (D) pageContext.getSession().setAttribute("name", theValue); (E) pageContext.setAttribute("name", theValue, PageContext.PAGE_SCOPE);

複選題
76 You want to create a valid directory structure for your Java EE web application, and your application uses tag files and a JAR file. Which three must be located directly in your WEB-INF directory (NOT in a subdirectory of WEB-INF)? (Choose three.) (A) The JAR file (B) A directory called lib (C) A directory called tags (D) A directory called TLDs (E) A directory called classes F. A directory called META-INF

複選題
77 Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServerletA service method:

20. String key = "com.example.data";

21. session.setAttribute(key, "Hello");

22. object value = session.getAttribute(key);

23.

Assume session is an HttpSession, and is not referenced anywhere else in Servlet A

Which two changes, taken together, ensure that value is equal to "Hello" on line 23? (Choose two) (A)ensure that the Servlet Bservice method is synchronized (B)ensure that the Servlet A service method is synchronized (C)ensure that Servlet B synchronizes on the session object when setting session attributes (D)enclose lines 21-22 in synchronized block:synchronized(this) (session.setAttribute(key, "Hello");value = session.getAttribute(key);) (E) enclose lines 21-22 in synchronized block:synchronized(session) (session.setAttribute(key, "Hello");value = session.getAttribute(key);)

78 You are building a dating service web site. Part of the form to submit a client's profile is a group of radio buttons for the person's hobbies: 20. ＜input type = 'radio' name = 'hobbyEnum' value = 'HIKING'＞ Hiking ＜br＞ 21. ＜input type = 'radio' name = 'hobbyEnum' value = 'SKING'＞ Sking ＜br＞ 22. ＜input type = 'radio' name = 'hobbyEnum' value = 'SCUBA'＞ SCUBA ＜br＞ 23. ＜! - - and more options - - ＞＞ After the user submits this form, a confirmation screen is displayed with these hobbies listed. Assume that an application-scoped hobbies, holds a map between the hobby enumerated type and the display name. Which EL code snippet will display Nth element of the user's selected hobbles? (A) ${hobbies [hobbyEnum[N]} (B) ${hobbies [paramValues.hobbyEnum[N]]} (C) ${hobbies [paramValues @ 'hobbyEnum' @N] (D) ${hobbies.get(paramValues.hobbyEnum[N]) } (E) ${hobbies [paramValues.hobbyEnum.get(N)] }

複選題
79 A web application allows the HTML title banner to be set using a context initialization parameter called titlestr. Which two properly set the title in the scenario? (Choose two) (A) ＜title＞ $ {titlestr} ＜/title＞ (B) ＜title＞ $ {initparam.titlestr}＜/title＞ (C) ＜title＞ $ {param [0]. titlestr} ＜/title＞ (D) ＜title＞ $ {paramValues.titleStr} ＜/title＞ (E) ＜title＞ $ {initParam ['titleStr'] } ＜/title＞ F. ＜title＞ $ {servletParams.titleStr} ＜/title＞ G. ＜title＞ $ {request.get ("titleStr") } ＜/title＞

80 Given the portion of a valid Java EE web application's directory structure:

You want to know whether File1.html, File2.html, and/or File3.html is protected from direct access by your web client's browsers. What statement is true? (A) All three files are directly accessible. (B) Only File1.html is directly accessible. (C) Only File2.html is directly accessible. (D) Only File3.html is directly accessible. (E) Only File1.html and File2.html are directly accessible. F. Only File1.html and File3.html are directly accessible. G. Only File2.html and File3.html are directly accessible.

Explanation Note: * WEB-INF is the folder just under the root of a WAR that holds information that you don't want to be accessible to a client via a URL request. Specifically, it holds the web.xml, classes, and lib directories, but you can put anything you want to hide from the client there. * META-INF is what discriminates a JAR file from a plain ZIP file. It holds the manifest file and may hold other deployment information as needed.

81 When using Servlet asynchronous API if you want to dispatch the request back to a particular url -"/url" within the same Servlet Context which of the following API would you use? (A) ASyncContext.dispatch(); (B) AsyncContext.dispatch("/url"); (C) AsyncContext.dispatch(servletContext, "/url"); (D) AsyncContext.start(runnable); (E) RequestDispatcher.fotward("/url"); F. RequestDispatcher.forward(servletContext, "/url"); G. RequestDispatcher.include("/url");

複選題
82 You want to create a filter for your web application and your filter will implement .servlet.Filter. Which two statements are true? (Choose two) (A) Your filter class must implement an init method and a destroy method. (B) Your filter class must also implement javax.sarvlat.FilterChain. (C) When your filter chains to the next filter, it should pass the same arguments it received in its doFilter method. (D) The method that your filter invokes on the object it received that implementsjavax - servlet.Filterchain can invoke either another filter or a servlet. (E) Your filter class must implement a doFilter method that takes, among other things, an HttpServletRequest object and an HttpServletresponse object.

83 Which describes a trigger that causes a call to an AsyncListener? (A) Completion of processing (B) Receipt of a new request from the same client (C) Addition of a new filter to the processing stream for this request (D) Completion of each timer interval

複選題
84 Which two are valid for transport for the enum TransportGuarantee in javax.servlet.annotation.ServletSecurity? (Choose two) (A) NONE (B) SECURE (C) INTEGRAL (D) ENCRYPTED (E) CONFIDENTIAL

85 You need to create a JavaBean object that is used only within the current ISP page. It must NOT be accessible to any other page including those that this page might import. Which JSP standard action ＜ .in accomplish this goal? (A) ＜jsp:useBean id = 'pageBean' type = 'com.example.MyBean' /＞ (B) ＜jsp:useBean id = 'pageBean' class = 'com.example.MyBean' /＞ (C) ＜jsp:makeBean id = 'pageBean' type = 'com.example.MyBean' /＞ (D) ＜jsp:makeBean id = 'pageBean' class = 'com.example.MyBean' /＞ (E) ＜jsp:useBean id = 'pageBean' class = 'com.example.MyBean' /＞ F. ＜jsp:makeBean id = 'pageBean' class = 'com.example.MyBean' /＞

複選題
86 Which two statements are true about the security-related tags in a valid Java EE deployment descriptor? (Choose two) (A) Every ＜security-constraint＞ tag must have at least one ＜http-method＞ tag. (B) A ＜security-constraint＞ tag can have many ＜web-resource-collection＞ tags. (C) A given ＜auth-constraint＞ tag can apply to only one ＜web-resource-collection> tag. (D) A given ＜web-resource-collection> tag can contain from zero to many ＜url-pattern> tags. (E) It is possible to construct a valid ＜security-constraint> tag such that, for a given resource user roles can access that resource.

複選題

87 View the Exhibit.

Given: 10. ＜form action='create_product.jsp'> 11. Product Name: ＜input type= 'text' name='productName'/>＜br/> 12. Product Price: ＜input type= 'text' name='productPrice'/>＜br/> 13. ＜/form> IT Certification Guaranteed, The Easy Way! 35 For a given product instance, which three jsp:setProperty attributes must be used to initialize its properties from the HTML form? (Choose three.) (A) id (B) name (C) type (D) param (E) property F. reqParam G. attribute

88 An appropriate jsp:useBean tag has been placed into a JSP, and identified the bean using the name "theBean". The bean class includes a method with the following signature: public boolean isOurCustomer () You wish to insert the test true or false into the output HTML based on the return value of this method. Which is true? (A) This can be achieved using a tag of the form: ＜jsp:getProperty name= "theBean" property "ourCustomer" /> (B) This can be achieved using a tag of the form: ＜jsp:getProperty id= "theBean" property= "ourCustomer" /> (C) This can be achieved using a tag of the form: ＜jsp:getProperty id= "theBean" invoke "getOurCustomer" /> (D) This can be achieved using a tag of the form: ＜jsp:getProperty name= "theBean" type= "boolean" property= "ourCustomer" /> (E) This cannot be achieved because the return type of isOurCustomer () is not String F. This cannot be achieved because the method isOurCustomer () does not adhere to JavaBeans conventions.

89 Which of the following are attributes of the annotation javax.servlet.annotation.WebFilter? (i) Name (ii) servletNames (iii) urlPatterns (iv) dispatcherTypes (v) supportAsync (A) (iii) only (B) (iii) and (iv) (C) (ii), (iii) and (iv) (D) (iii), (iv) and (v) (E) (ii), (iii), (iv) and (v) Answer: B

Explanation

(iii) urlPatterns

The URL patterns to which the filter applies

* (iv) dispatcherTypes

The dispatcher types to which the filter applies

* (not V): asyncSupported

Declares whether the filter supports asynchronous operation mode.

Note:

* javax.servlet.annotation

Annotation Type WebFilter

Annotation used to declare a servlet filter.

This annotation is processed by the container at deployment time, and the corresponding filter applied to the specified URL patterns, servlets, and dispatcher types. 90 Which interface must a class implement so that instances of the class are notified after any object added to a session? (A) javax.servlet.http.HttpSessionListener (B) javax.servlet.http.HttpSessionValueListener (C) javax.servlet.http.HttpSessionBindingListener (D) javax.servlet.http.HttpSessionAttributeListener

91 View the Exhibit.

Given the web application deployment descriptor elements: 11. ＜filter> 12. ＜filter-name>ParamAdder＜/filter-name> 13. ＜filter-class>com.example.ParamAdder＜/filter-class> 14. ＜/filter> ... 31. ＜filter-mapping> 32. ＜filter-name>ParamAdder＜/filter-name> 33. ＜servlet-name>Destination＜/servlet-name> 34. ＜/filter-mapping> ... 55. ＜servlet-mapping> 56. ＜servlet-name>Destination＜/servlet-name> 57. ＜url-pattern>/dest/Destination＜/url-pattern> 58. ＜/servlet-mapping>What is the result of a client request of the Source servlet with no query string? (A) The output "filterAdded = null" is written to the response stream. (B) The output "filterAdded = addedByFilter" is written to the response stream. (C) An exception is thrown at runtime within the service method of the Source servlet. (D) An exception is thrown at runtime within the service method of the Destination servlet.

92 You are building your own layout mechanism by including dynamic content for the page's header and footer sections. The footer is always static, but the header generates the ＜title> tag that requests the page name to be specified dynamically when the header is imported. Which JSP code snippet performs the import of the header content? (A) ＜jsp:include page='/WEB-INF/jsp/header.jsp'>＜jsp:param name='pageName' value='Welcome Page' />＜/jsp:include> (B) ＜jsp:import page='/WEB-INF/jsp/header.jsp'>＜jsp:param name='pageName' value='Welcome Page' />＜/jsp:import> (C) ＜jsp:include page='/WEB-INF/jsp/header.jsp'>＜jsp:attribute name='pageName' value='Welcome Page' />＜/jsp:include> (D) ＜jsp:import page='/WEB-INF/jsp/header.jsp'>＜jsp:attribute name='pageName' value='Welcome Page' />＜/jsp:import>

93 You are working on a JSP that is intended to inform users about critical errors in the system. The JSP code is attempting to access the exception that represents the cause of the problem, but your IDE is telling you that the variable does not exist. What should you do to address this problem? (A) Add a page directive stating that this page is an error handler (B) Add scriptlet code to create a variable that refers to the exception (C) Add a ＜jsp:useBean tag to declare the and access the exception (D) Perform the error handling in a servlet rather than in the JSP (E) Edit the page that caused the error to ensure that it specifies this page as its error handler

Explanation

Exception is a JSP implicit variable

The exception variable contains any Exception thrown on the previous JSP page with an errorPage directive that forwards to a page with an isErrorPage directive.

Example:

If you had a JSP (index.jsp) which throws an exception (I have deliberately thrown a NumberFormatException by parsing a String, obviously you wouldn't write a page that does this, its just an example)

＜%@ page errorPage="error.jsp" %>

＜% Integer.parseInt("foo"); //throws an exception %>

This will forward to error.jsp,

If error.jsp was

＜%@ page isErrorPage = "true"%>

＜body>

＜h2>Your application has generated an error＜/h2>

＜h3>Please check for the error given below＜/h3>

＜b>Exception:＜/b>＜br> ＜font color="red">＜%= exception.toString() %>＜/font>

＜/body>

Because it has the

＜%@ page isErrorPage = "true"%>

page directive, the implicit variable exception will contain the Exception thrown in the previous jsp So when you request index.jsp, the Exception will be thrown, and forwarded to error.jsp which will output html like this

＜body>

＜h2>Your application has generated an error＜/h2>

＜h3>Please check for the error given below＜/h3>

＜b>Exception:＜/b>＜br>

＜font color="red">java.lang.NumberFormatException: For input string: "foo"＜/font>

＜/body>

As @JB Nizet mentions exception is an instanceof Throwable calling exception.getMessage() For input string:

"foo" instead of java.lang.NumberFormatException: For input string: "foo"

94 Given this fragment in a servlet:

23. if(reg.isUserInRole("Admin")) {

24. // do stuff

25. }

And the following fragment from the related Java EE deployment descriptor:

812. ＜security-role-ref>

813. ＜role-name>Admin＜/role-name>

814. ＜role-link>Administrator＜/role-link>

815. ＜/security-role-ref>

900. ＜security-role>

901. ＜role-name>Admin＜/role-name>

902. ＜role-name>Administrator＜/role-name>

903. ＜/security-role>

What is the result?

(A) Line 24 can never be reached. (B) The deployment descriptor is NOT valid. (C) If line 24 executes, the user's role will be Admin. (D) If line 24 executes, the user's role will be Administrator. (E) If line 24 executes, the user's role will NOT be predictable.

95 To take advantage of the capabilities of modern browsers that use web standards, such as XHTML and CSS, your web application is being converted from simple JSP pages to JSP Document format. However, one of your JSPs, /scripts/screenFunctions.jsp, generates a JavaScript file. This file is included in several web forms to create screen-specific validation functions and are included in these pages with the following statement:

Which JSP code snippet declares that this JSP Document is a JavaScript file? (A) ＜%@ page contentType='application/javascript' %> (B) ＜jsp:page contentType='application/javascript' /> (C) ＜jsp:document contentType='application/javascript' /> (D) ＜jsp:directive.page contentType='application/javascript' /> (E) No declaration is needed because the web form XHTML page already declares the MIME type of the /scripts/screenFunctions.jsp file in the ＜script> tag.

複選題
96 For which three events can web application event listeners be registered? (Choose three.) (A) when a session is created (B) after a servlet is destroyed (C) when a session has timed out (D) when a cookie has been created (E) when a servlet has forwarded a request F. when a session attribute value is changed

97 You have a new IT manager that has mandated that all JSPs must be refactored to include no scriptlet code. The IT manager has asked you to enforce this. Which deployment descriptor element will satisfy this constraint? (A) ＜jsp-property-group>＜url-pattern>*.jsp＜/url-pattern>＜permit-scripting>false＜/permitscripting>＜/jsp-pro (B) ＜jsp-config>＜url-pattern>*.jsp＜/url-pattern>＜permit-scripting>false＜/permit-scripting>＜/jspconfig> (C) ＜jsp-config>＜url-pattern>*.jsp＜/url-pattern>＜scripting-invalid>true＜/scripting-invalid>＜/jspconfig> (D) ＜jsp-property-group>＜url-patterm>*.jsp＜/url-pattern>＜scripting-invalid>true＜/scriptinginvalid>＜/jsp-pro

98 Which element of a web application deployment descriptor ＜web-resource-collection> element is used to specify a HTTP method to which the corresponding ＜security-constraint> will not apply? (A) ＜exclude-http-method> (B) ＜neglect-http-method> (C) ＜http-method-omission> (D) ＜http-method-excluded> (E) ＜exceptional-http-method>

99 You are implementing a model component. You realize that an IOException might arise if you lose connection to the database. How should you address this? (A) Implement multipathing to provide redundant connectivity to the database, thereby avoiding that risk of connection failure. (B) Provide an error handler page, and use the page directive in the invoking ISP to redirect to that page if the error arises. (C) Use the JSTL ＜c:catch> tag to take control if the exception arises. (D) Surround the problem area with a try/catch block and implement appropriate recovery or fallback behavior.

100 Assume the custom tag my:errorProne always throws a java.lang.RuntimeException with the message "File not found." An error page has been configured for this JSP page. Which option prevents the exception thrown by my:errorProne from invoking the error page mechanism, and outputs the message "File not found" in the response? (A) ＜c:try catch="ex">＜my:errorProne />＜/c:try>${ex.message} (B) ＜c:catch var="ex">＜my:errorProne />＜/c:catch>${ex.message} (C) ＜c:try>＜my:errorProne />＜/c:try>＜c:catch var= "ex" />$ {ex.message} (D) ＜c :try>＜my:errorProne />＜c:catch var= "ex" />${ex.message}＜/c :try> (E) ＜my:errorProne>＜c:catch var= "ex">${ex.message}＜/c:catch>＜/my:errorProne>

申論題 (2)

64 Which EL expression evaluates to the request URI? (A) ${requestURI} (B) ${request.URI} (C) ${request.getURI} (D) ${request.requestURI} (E) ${requestScope.requestURI} F. ${pageContext.request.requestURI} G. ${requestScope.request.requestDRI}

69 As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionI(D) In addition, assume that your webapp keeps a hasmap of session objects by the I(D) Here is a partial implementation of this servlet: 10. public class SessionAgeServlet extends HttpServlet { 11. public void service(HttpServletRequest request, HttpServletResponse) throws IOException { 12. String sessionID = request.getParameter("sessionID"); 13. HttpSession session = getSession(sessionID); 14. long age = // your code here 15. response.getWriter().print(age); 16. } ... // more code here 47. } Which code snippet on line 14, will determine the age of the session? (A) session.getMaxInactiveInterval(); (B) session.getLastAccessed().getTime() - session.getCreationTime().getTime(); (C) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime(); (D) session.getLastAccessed() - session.getCreationTime(); (E) session.getMaxInactiveInterval() - session.getCreationTime(); F. session.getLastAccessedTime() - session.getCreationTime();

無年度 - Java EE 6 Web Component Developer Certified Expert Exam：1z0-899(51-100)#84004

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