Oracle Oracle Certifications 1Z0-858 Questions & Answers

• Question 141:

  You want to create a filter for your web application and your filter will implement javax.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.servlet.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 implements javax.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.

  Correct Answer: AD

• Question 142:

  You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client's license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter. Which code snippet will accomplish this goal?

  A. You cannot do this because context parameters CANNOT be altered programmatically.

  B. String ext = context.getParameter('licenseExtension');if ( ext == null ) {context.setParameter ('licenseExtension', DEFAULT);}

  C. String ext = context.getAttribute('licenseExtension');if ( ext == null ) {context.setAttribute ('licenseExtension', DEFAULT);}

  D. String ext = context.getInitParameter('licenseExtension');if ( ext == null ) {context.resetInitParameter ('licenseExtension', DEFAULT);}

  E. String ext = context.getInitParameter('licenseExtension');if ( ext == null ) {context.setInitParameter ('licenseExtension', DEFAULT);}

  Correct Answer: A

• Question 143:

  You are designing an n-tier Java EE application. You have already decided that some of your JSPs will need to get data from a Customer entity bean. You are trying to decide whether to use a Customer stub object or a Transfer Object. Which two statements are true? (Choose two.)

  A. The stub will increase network traffic.

  B. The Transfer Object will decrease data staleness.

  C. The stub will increase the logic necessary in the JSPs.

  D. In both cases, the JSPs can use EL expressions to get data.

  E. Only the Transfer Object will need to use a Business Delegate.

  F. Using the stub approach allows you to design the application without using a Service Locator.

  Correct Answer: AD

• Question 144:

  You have a simple web application that has a single Front Controller servlet that dispatches to JSPs to generate a variety of views. Several of these views require further database processing to retrieve the necessary order object using the orderID request parameter. To do this additional processing, you pass the request first to a servlet that is mapped to the URL pattern /WEB-INF/retreiveOrder.do in the deployment descriptor. This servlet takes two request parameters, the orderID and the jspURL. It handles the database calls to retrieve and build the complex order objects and then it dispatches to the jspURL.

  Which code snippet in the Front Controller servlet dispatches the request to the order retrieval servlet?

  A. request.setAttribute("orderID", orderID);request.setAttribute("jspURL", jspURL);RequestDispatcher view= context.getRequestDispatcher("/WEB- INF/retreiveOrder.do");view.forward(request, response);

  B. request.setParameter("orderID", orderID);request.setParameter("jspURL", jspURL);Dispatcher view= request.getDispatcher("/WEB-INF/retreiveOrder.do");view.forwardRequest(request, response);

  C. String T="/WEB-INF/retreiveOrder.do?orderID=%dandjspURL=%s";String url = String.format(T, orderID, jspURL);RequestDispatcher view= context.getRequestDispatcher(url);view.forward(request, response);

  D. String T="/WEB-INF/retreiveOrder.do?orderID=%dandjspURL=%s";String url = String.format(T, orderID, jspURL);Dispatcher view= context.getDispatcher(url);view.forwardRequest(request, response);

  Correct Answer: C

• Question 145:

  A developer is designing a web application that makes many fine-grained remote data requests for each client request. During testing, the developer discovers that the volume of remote requests significantly degrades performance of the application. Which design pattern provides a solution for this problem?

  A. Flyweight

  B. Transfer Object

  C. Service Locator

  D. Dispatcher View

  E. Business Delegate

  F. Model-View-Controller

  Correct Answer: B

• Question 146:

  In an n-tier application, which two invocations are typically remote, not local? (Choose two.)

  A. JSP to Transfer Object

  B. Service Locator to JNDI

  C. Controller to request object

  D. Transfer Object to Entity Bean

  E. Controller to Business Delegate

  F. Business Delegate to Service Locator

  Correct Answer: BD

• Question 147:

  A developer has created a special servlet that is responsible for generating XML content that is sent to a data warehousing subsystem. This subsystem uses HTTP to request these large data files, which are compressed by the servlet to save internal network bandwidth. The developer has received a request from management to create several more of these data warehousing servlets. The developer is about to copy and paste the compression code into each new servlet. Which design pattern can consolidate this compression code to be used by all of the data warehousing servlets?

  A. Facade

  B. View Helper

  C. Transfer Object

  D. Intercepting Filter

  E. Composite Facade

  Correct Answer: D

• Question 148:

  A developer is designing the presentation tier for a web application which requires a centralized request handling to complete common processing required by each request. Which design pattern provides a solution to this problem?

  A. Remote Proxy

  B. Front Controller

  C. Service Activator

  D. Intercepting Filter

  E. Business Delegate

  F. Data Access Object

  Correct Answer: B

• Question 149:

  Given:

  6.

  7.

  <%="processing" %>

  8.

  and a custom tag handler for foo which extends TagSupport.

  Which two are true about the tag handler referenced by foo? (Choose two.)

  A. The doStartTag method is called once.

  B. The doAfterBody method is NOT called.

  C. The EVAL_PAGE constant is a valid return value for the doEndTag method.

  D. The SKIP_PAGE constant is a valid return value for the doStartTag method.

  E. The EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.

  Correct Answer: AC

• Question 150:

  Which three are valid values for the body-content attribute of a tag directive in a tag file? (Choose three.)

  A. EL

  B. JSP

  C. empty

  D. dynamic

  E. scriptless

  F. tagdependent

  Correct Answer: CEF