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1Z0-899 Questions and Answers

1Z0-899


QUESTION: 98

Given:

  1. class MyServlet extends HttpServlet {

  2. public void doPut(HttpServletRequest req, HttpServletResponse resp)

    throws ServletException, IOException {

  3. // servlet code here

  1. }

  2. }

If the DD contains a single security constraint associated with MyServlet and its only

<http- method> tags and <auth-constraint> tags are:

<http-method>GET</http-method>

<http-method>PUT</http-method>

<auth-constrain>Admin</auth-constrain>

Which four requests would be allowed by the container? (Choose four)


  1. A user whose role is Admin can perform a PUT.

  2. A user whose role is Admin can perform a GET.

  3. A user whose role is Admin can perform a POST.

  4. A user whose role is Member can perform a PUT.

  5. A user whose role is Member can perform a POST.

  6. A user whose role is Member can perform a GET.


Answer: A, B, C, E


QUESTION: 99

Given this fragment in a servlet:

  1. if(reg.isUserInRole(“Admin”)) {

  2. // do stuff

  3. }

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?


  1. Line 24 can never be reached.

  2. The deployment descriptor is NOT valid.

  3. If line 24 executes, the user’s role will be Admin.

  4. If line 24 executes, the user’s role will be Administrator.

  5. If line 24 executes, the user’s role will NOT be predictable.


Answer: D


QUESTION: 100

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


  1. httpServletRequest.isUserInRole(“MANAGER”);

  2. httpServletRequest.isCallerInRole(“MANAGER”);

  3. httpServletRequest.isPrincipalInRole(“MANAGER”);

  4. httpServletRequest.isAuthnticatedUserInRole(“MANAGER”);


Answer: A


Explanation:

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: 101

A web application uses a cookies to track a client as it navigates through the pages that constitutes the application. Which code snippet can be used by the web application to reduce the chance of a cross-site scripting attack by setting some property of the cookie before returning it to the client?


  1. cookie.setHttpOnly(true)

  2. cookie.setMaxAge(3600)

  3. cookie.setPath(“/”)

  4. cookie.setSecure(true)


Answer: A


Explanation:

When HTTPOnly flag is assigned to a cookie, the browser will restrict the access to such Cookie from Java Script code hence the cookie would only be sent to the subsequent request to server but cannot be accessed using client side script. In such a case even if website is vulnerable to Cross Site Scripting (XSS) attacks, still the browser would safeguard the data stored into cookies flagged as HTTPOnly. Incorrect:

Not D: If Secure flag is set for Cookie then it may only be transmitted over secure channel (SSL/HTTPS) ensuring that data is always encrypted while transmitting from client to server.


QUESTION: 102

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?


  1. All three files are directly accessible.

  2. Only File1.html is directly accessible.


  3. Only File2.html is directly accessible.

  4. Only File3.html is directly accessible.

  5. Only File1.html and File2.html are directly accessible.

  6. Only File1.html and File3.html are directly accessible.

  7. Only File2.html and File3.html are directly accessible.


Answer: B


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.


    QUESTION: 103

    Given a web fragment jar file, where should we put the web fragment.xml inside the jar file?


    1. WEB-INF

    2. META-INF

    3. WEB-INF/lib

    4. WEB-INF/classes

    5. META-INF/services


    Answer: C


    Explanation:

  • If you're dealing with web applications, /WEB-INF/lib is the portable place to put JARs. This is where web servers servlet containers expect to find an application's jar files.

  • The /WEB-INF/classes directory is on the ClassLoader's classpath. This is where

    .class files are loaded from when the web application is executing. Any JAR files placed in the /WEB-INF/lib directory will also be placed on the ClassLoader's classpath.


    QUESTION: 104

    Given the fragment from Java EE deployment descriptor:

    1. <error-page>


    2. <exception-type>java.lang.Throwable</exception-type>

    3. <location>/mainError.jsp</location>

    4. </error-page>

    5. <error-page>

    6. <exception-type>java.lang.ClassCastException</exception-type>

    7. <location>/castError.jsp</location>

    8. </error-page>

    If the web application associated with the fragment above throws a ClassCastException. Which statement is true?


    1. The deployment descriptor is invalid.

    2. The container invokes mainError.jsp

    3. The container invokes castError.jsp

    4. Neither mainError.jsp nor castError.jsp is invoked.


    Answer: C


    QUESTION: 105

    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

    <context-param> 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);}

    1. String ext = context.getAttribute(‘licenseExtension’);if ( ext == null ) { context.setAttribute(‘licenseExtension’ DEFAULT);}

    2. String ext = context.getInitParameter(‘licenseExtension’)if ( ext == null ) { context.resetInitParameter(‘licenseExtension’ DEFAULT);}

    3. String ext = context.getInitParameter(‘licenseExtension’)if ( ext == null ) { context.setInitParameter(‘licenseExtension’ DEFAULT);}


    Answer: A


    QUESTION: 106


    Which of the following are attributes of the annotation javax.servlet.annotation.WebFiler?

    • Name

    • servletNames

    • urlPatterns

    • dispatcherTypes

    • supportAsync


      1. (iii) only

      2. (iii) and (iv)

      3. (ii), (iii) and (iv)

      4. (iii), (iv) and (v)

      5. (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.


    QUESTION: 107

    Which of following annotations can be used in a servlet class?

    • @javax.annotation.Resource

    • @javax.annotation.PreDestroy

    • @javax.annotation.security.RunAs

    • @javax.annotation.security.RolesAllowed

    • @javax.servlet.annotation.WebServlet


    1. (v) only

    2. (i) and (v)

    3. (i), (ii), (iii) and (v)


    4. (i), (ii), (iv) and (v)

    5. (i), (ii), (iii), (iv) and (v)


    Answer: B


    Explanation:

  • (i) The javax.annotation.Resource annotation is used to declare a reference to a resource. @Resource can decorate a class, a field, or a method.

  • (v) javax.servlet.annotation Annotation Type WebServlet Annotation used to declare a servlet.

    This annotation is processed by the container at deployment time, and the corresponding servlet made available at the specified URL patterns.

    Incorrect:

  • Not (II) : javax.annotation.PreDestroy Target: Method


QUESTION: 108

When using the @WebListener annotation, the class on which the annotation is applied to must also implement at least one o the following interfaces – (Choose two):


  1. RequestListener

  2. AttributeListener

  3. ServletContextListener

  4. HttpSessionListener

  5. SessionAttributeListener

  6. AsyncListener


Answer: C, D


Explanation:

@WebListener

The main task of the listener is to listen the particular events and process your own task on that event. For example, if you want to initialize a database connection before your application starts, ServletContextListener will be implemented to do that. Another good example is -when you want to do some task on the creation and destruction of a session. For this purpose you need to implement HttpSessionListener.

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