Oracle 1Z0-858 Online Practice Questions and Exam Preparation

Oracle 1Z0-858 Online Questions & Answers

• Question 161:

  Given:

  1.

  package com.example;

  2.

  3.

  public abstract class AbstractItem {

  4.

  private String name; ...

  13. }

  Assume a concrete class com.example.ConcreteItem extends com.example.AbstractItem. A servlet sets a session-scoped attribute called "item" that is an instance of com.example.ConcreteItem and then forwards to a JSP page.

  Which two are valid standard action invocations that expose a scripting variable to the JSP page? (Choose two.)

  BC

• Question 162:

  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.HttpSessionBindingListener
  C. javax.servlet.http.HttpSessionAttributeListener
  D. javax.servlet.http.HttpSessionActivationListener
  D. javax.servlet.http.HttpSessionActivationListener

• Question 163:

  Which three are described in the standard web application deployment descriptor? (Choose three.)

  A. session configuration
  B. MIME type mappings
  C. context root for the application
  D. servlet instance pool configuration
  E. web container default port bindings
  F. ServletContext initialization parameters
  A. session configuration
  B. MIME type mappings
  F. ServletContext initialization parameters

• Question 164:

  You want to create a valid directory structure for your Java EE web application, and you want to put your web application into a WAR file called MyApp.war. Which two are true about the WAR file? (Choose two.)

  A. At deploy time, Java EE containers add a directory called META-INF directly into the MyApp directory.
  B. At deploy time, Java EE containers add a file called MANIFEST.MF directly into the MyApp directory.
  C. It can instruct your Java EE container to verify, at deploy time, whether you have properly configured your application's classes.
  D. At deploy time, Java EE containers add a directory call META-WAR directly into the MyApp directory.
  A. At deploy time, Java EE containers add a directory called META-INF directly into the MyApp directory.
  C. It can instruct your Java EE container to verify, at deploy time, whether you have properly configured your application's classes.

• Question 165:

  Which two statements are true about using the isUserInRole method to implement security in a Java EE application? (Choose two.)

  A. It can be invoked only from the doGet or doPost methods.
  B. It can be used independently of the getRemoteUser method.
  C. Can return "true" even when its argument is NOT defined as a valid role name in the deployment descriptor.
  D. Using the isUserInRole method overrides any declarative authentication related to the method in which it is invoked.
  E. Using the isUserInRole method overrides any declarative authorization related to the method in which it is invoked.
  B. It can be used independently of the getRemoteUser method.
  C. Can return "true" even when its argument is NOT defined as a valid role name in the deployment descriptor.

• Question 166:

  Your web application uses a simple architecture in which servlets handle requests and then forward to a JSP using a request dispatcher. You need to pass information calculated in the servlet to the JSP for view generation. This information must NOT be accessible to any other servlet, JSP or session in the webapp. Which two techniques can you use to accomplish this goal? (Choose two.)

  A. Add attributes to the session object.
  B. Add attributes on the request object.
  C. Add parameters to the request object.
  D. Use the pageContext object to add request attributes.
  E. Add parameters to the JSP's URL when generating the request dispatcher.
  B. Add attributes on the request object.
  E. Add parameters to the JSP's URL when generating the request dispatcher.

• Question 167:

  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 deployer 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 HttpSession objects.
  C. As per the specification, the J2EE web container ensures that distributed HttpSession objects will be stored in a database.
  D. Storing references to Enterprise JavaBeans components in the HttpSession object might NOT be supported by J2EE web containers.
  A. The J2EE web container must support migration of objects that implement Serializable.
  D. Storing references to Enterprise JavaBeans components in the HttpSession object might NOT be supported by J2EE web containers.

• Question 168:

  You are building a dating web site. The client's date of birth is collected along with lots of other information. The Person class has a derived method, getAge():int, which returns the person's age calculated from the date of birth and today's date. In one of your JSPs you need to print a special message to clients within the age group of 25 through 35. Which two EL code snippets will return true for this condition? (Choose two.)

  A. ${client.age in [25,35]}
  B. ${client.age between [25,35]}
  C. ${client.age between 25 and 35}
  D. ${client.age = 25}
  E. ${client.age le 35 and client.age ge 25}
  F. ${not client.age > 35 andand client.age < 25}
  D. ${client.age = 25}
  E. ${client.age le 35 and client.age ge 25}

• Question 169:

  Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.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 ServletA.

  Which two changes, taken together, ensure that value is equal to "Hello" on line 23? (Choose two.)

  A. ensure that the ServletB.service method is synchronized
  B. ensure that the ServletA.service method is synchronized
  C. ensure that ServletB synchronizes on the session object when setting session attributes
  D. enclose lines 21-22 in a synchronized block:synchronized(this) {session.setAttribute(key, "Hello");value = session.getAttribute(key);}
  E. enclose lines 21-22 in a synchronized block:synchronized(session) {session.setAttribute(key, "Hello");value = session.getAttribute(key);}
  C. ensure that ServletB synchronizes on the session object when setting session attributes
  E. enclose lines 21-22 in a synchronized block:synchronized(session) {session.setAttribute(key, "Hello");value = session.getAttribute(key);}

• Question 170:

  Place the corresponding resources and directories in the proper web application deployment structure.

  Select and Place: