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Java EE 6 Enterprise Architect Certified Master Exam

Question No: 21

Which three web applications work best when they are designed to be server-push enabled?

  1. A news feed used for providing users with frequently updated news content

  2. A web chat that allows users to communicate using easily accessible web interfaces

  3. A live sporting event application, used to deliver current results during matches

  4. An auction system that provides users with live online bidding

  5. A graphics rendering application that generates visuals in an orderly fashion

Answer: B,C,D

Question No: 22

A manufacturing company has a large investment in a legacy Inventory Management System (IMS) developed with third-party technologies. You have been asked to design a Java EE application that interacts with it.

You would like to ensure the following:

->Minimal application code is required to parse the communication messages.

->Communication is asynchronous and stateless.

->Performance import of the existing system is minimal.

Which two technologies combined would meet these requirements?

  1. XML

  2. JSON

  3. RMI

  4. JAX-RS

  5. JAX-WS

Answer: B,D

Question No: 23

Which is an objective of the Strategy pattern?

  1. To provide a way to configure a class with one of many behaviors

  2. To define an object that encapsulates how a set of objects interacts

  3. To define the skeleton of an algorithm, deferring some steps to subclasses

  4. To decouple an abstraction horn its implementation so that the two can vary independently

  5. To define a family of algorithms, encapsulate each one, and make them interchangeable

  6. To allow subclasses to redefine certain steps of an algorithm without changing the algorithm#39;s structure

Answer: A

Question No: 24

You need to restrict access to the administration screens in your website.

Which two techniques test a user#39;s permissions before granting access to a particular screen?

  1. Enterprise JavaBeans (EJB) entity

  2. Servlet filter

  3. Custom tag library

  4. Deployment descriptor

  5. Custom JavaScript in JSP

Answer: B,D

Question No: 25

A company is extending is successful social networking site to support the following channels: instant messaging (IM), email messaging and text messaging/SMS. At present, the site has scaled 400% in one year using a standard MVC Web framework the application experiences large surges or spikes in demand and also periods of inactivity.

Notification delivery to the three channels does not need to be guaranteed.

Which solutions extends the current architecture and best meets the company’s requirements?

  1. Send the notification inline, that is, within the normal HTTP request-response cycle.

  2. Place messaging on a Java messaging Service (JMS) queue and use message-driven beans (MDBs) to create and send notifications.

  3. Insert the messages into a database and use plain old Java Objects (POJOs) to read the messaging using JDBC and send notifications.

  4. Insert the messages into a database and use entity beans to read the messages using JDBC and send notifications.

Answer: B

Question No: 26

A company must honor a service-level agreement (SLA) for its application, which states all database requests must execute within three seconds.

Users complain that some requests take longer than five seconds to complete. You have been contracted to fix the problem.

Which course of action do you recommend?

  1. Modify the program to implement multi threading and an event-driven design.

  2. Add servers to distribute the load.

  3. Upgrade the application server and the operating system.

  4. Define a plan for isolating the bottleneck, and define indicators that will measure performance under a test load.

Answer: D

Question No: 27

Your CMC wants to move several web based search applications to an AJAX model, hoping to improve user engagement with a browser experience that feels smaller and more responsive.

Which identifies a drawback to consider when adopting an AJAX model to improve user experience?

  1. Maintaining current performance could require more hardware.

  2. Maintaining accessibility across clients may require more development.

  3. Maintaining security within the page could be more difficult.

  4. Maintaining page navigability for users would have to be re-evaluated.

  5. Maintaining a scalable system could require redesigning applications.

Answer: C

Question No: 28

A company has been soiling a desktop based billing application that has Character User Interface (CUI) application developed by using Java. The company would like to release the next version of this application with the following features: a GUI with a pluggable look- and-feel capability and the flexibility to support multiple database vendors.

Which two technologies would you use in the new version?

  1. Swing

  2. JDBC

  3. JPA

  4. CMP

  5. AWT

Answer: A,B

Reference: http://en.wikipedia.org/wiki/Java_Platform,_Standard_Edition (see javax.swing and java.sql)

Question No: 29

An online library wants to introduce a feature where an email notification is generated whenever a book becomes available for circulation. This notification must be sent to only those members who have expressed interest in that book.

Which design pattern would you use to implement this requirement?

  1. Observer

  2. Payload Extractor

  3. Asynchronous Resource Integrator

  4. Web Service Broker

  5. Service Starter

Answer: A

Question No: 30

You are designing a new subsystem to store and scratch for user commands in a fashion company’s website. On class, CommentManager, is responsible for accessing comment data and providing read-only access to other objects in the subsystem.

Which two implementation details are necessary for the Cementmanager class?

  1. The storage mechanism implemented in CommentManager must be private to CommentManager.

  2. All the accessor and mutator methods in CommentManager must have the static modifier in their declarations.

  3. The comments must be assessable directly only within CommentManager.

  4. CommentManager should be a singleton object.

Answer: A,C

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