Oracle 1Z0-899 Online Practice Questions and Exam Preparation

Oracle 1Z0-899 Online Questions & Answers

• Question 21:

  Given an HttpServletRequestrequest and HttpResponseresponse, which sets a cookie "username" with the value "joe" in a servlet?

  A. request.addCookie("username", "joe")
  B. request.setCookie("username", "joe")
  C. response.addCookie("username", "joe")
  D. request.addHeader(new Cookie("username", "joe"))
  E. request.addCookie(new Cookie("username", "joe"))
  F. response.addCookie(new Cookie("username", "joe"))
  G. response.addHeader(new Cookie("username", "joe"))
  F. response.addCookie(new Cookie("username", "joe"))

• Question 22:

  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
  A. when a session is created
  C. when a session has timed out
  F. when a session attribute value is changed

• Question 23:

  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()
  C. servletRequest.getParts()
  D. servletRequest.getAllParts()
  A. HttpServletRequest.getParts()

  ---

  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, can be used to get an Iterator over all the Part objects.

• Question 24:

  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.

  813.

  Admin

  814.

  Administrator

  815.

  900.

  901.

  Admin

  902.

  Administrator

  903.

  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.
  D. If line 24 executes, the user's role will be Administrator.

• Question 25:

  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");
  C. AsyncContext.dispatch(servletContext, "/url");

  ---

  Reference: http://blogs.oracle.com/enterprisetechtips/entry/asynchronous_support_in_servlet_3 (Topic: AsyncContext Class, third paragraph)

• Question 26:

  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
  A. PUT
  D. DELETE

• Question 27:

  Which java code snippet checks whether the user is of the role "MANAGER" for a given HttpServRequest, httpServletRequest?

  A. httpServletRequest.isUserInRole("MANAGER");
  B. httpServletRequest.isCallerInRole("MANAGER");
  C. httpServletRequest.isPrincipalInRole("MANAGER");
  D. httpServletRequest.isAuthnticatedUserInRole("MANAGER");
  A. httpServletRequest.isUserInRole("MANAGER");

  ---

  isUserInRole

  public boolean isUserInRole(java.lang.String role)

  Returns a boolean indicating whether the authenticated user is included in the specified logical "role". Roles and role membership can be defined using deployment descriptors. If the user has not been authenticated, the method returns false.

  Parameters:

  role - a String specifying the name of the role

  Returns:

  a boolean indicating whether the user making this request belongs to a given role; false if the user has not been authenticated

  Incorrect:

  Not B: isCallerInRole is depreciated.

• Question 28:

  Users of your web application have requested that they should be able to set the duration of their sessions. So for example, one user might want a webapp to stay connected for an hour rather than the webapp's default of fifteen minutes; another user might want to stay connected for a whole day.

  Furthermore, you have a special login servlet that performs user authentication and retrieves the object from the database. You want to augment this code to set up the user's specified session duration.

  Which code snippet in the login servlet will accomplish this goal?

  A. User user = / / retrieves the user objects object from the database session.setDurationInterval (user.getSessionDuration());
  B. User user = / / retrieves the User objects from the database session.setInactiveInterval (user.getSessionDuration());
  C. User user = / / retrieves the user objects object from the database session.setInactiveInterval (user.get.SessionDuration());
  D. User user = / / retrieves the user objects object from the database session.setDuration (user.getSessionDuration());
  E. User user = / / retrieves the user objects object from the database session.setMaxInactiveInterval (user.getSessionDuration());
  F. User user = / / retrieves the user objects object from the database session.setMaxDurationInterval (user.getSessionDuration());
  E. User user = / / retrieves the user objects object from the database session.setMaxInactiveInterval (user.getSessionDuration());

• Question 29:

  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 refer to the exception
  C. Add a
  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
  A. Add a page directive stating that this page is an error handler

  ---

  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"%>

  Your application has generated an error

  Please check for the error given below

  Exception:
  

  <%= exception.toString() %> 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

  Your application has generated an error

  Please check for the error given below

  Exception:
  

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

• Question 30:

  Which two are true about the JSTL core iteration custom tags? (Choose two.)

  A. It may iterate over arrays, collections, maps, and strings.
  B. The body of the tag may contain EL code, but not scripting code.
  C. When looping over collections, a loop status object may be used in the tag body.
  D. It may iterate over map, but only the key of the mapping may be used in the tag body.
  E. When looping over integers (for example begin= `1' end= `10'), a loop status object may not be used in the tag body.
  A. It may iterate over arrays, collections, maps, and strings.
  C. When looping over collections, a loop status object may be used in the tag body.