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Java EE 6 Enterprise Architect Certified Master Exam

Question No: 41

A company wants to design an internal website for the purpose of managing its numerous social events. The site will not have heavy traffic, but will require state to be persisted in a database. You have been tasked to complete this action item in your spare time.

Which two Java EE-based approaches are best suited for quick development?

  1. Use JPA in the web tier only.

  2. Use message-driven beans to manage the posting of events.

  3. Use your domain model components as JavaServer Faces (JSF) managed beans.

  4. Use an Enterprise javaBeans (EJB) container to service-inject the domain model and support a JPA deployment.

Answer: A,C

Question No: 42

Which three statements are true about inheritance?

  1. Inheritance helps to reuse existing code implementations.

  2. It should be possible to substitute the derived class for its base class.

  3. Inheritance allows you to modify the behavior of objects.

  4. Inheritance promotes encapsulation better than interfaces.

  5. The derived class must override all methods of the base class.

Answer: A,B,C

Question No: 43

Blue Berry Corporation, one of the biggest fruit traders in Canada, has the biggest competitor, Red Cherry Corporation. Blue Berry uses a web application that is developed by using java technologies, whereas Red Cherry’s web application uses non-Java technologies. Blue Berry plans to share business sensitive, transactional data between the two systems by integrating them in a loosely coupled manner.

Which technology should be used to this?

  1. JMS

  2. JCA

  3. XML over HTTPS

  4. RMI over IIOP

  5. JBI

Answer: B

Question No: 44

Which two actions limit the consequences of a network based attack?

  1. Implementing the principle of least privilege

  2. Installing a firewall at the outer boundary of your systems

  3. Placing Internet-accessible servers in a demilitarized zone

  4. Deploying a single sign-on system to provide system-wide authorization

  5. Allowing application servers privileged access to all databases

Answer: A,E

Question No: 45

You are implementing an online music that will store and play a user’s collection of songs. You want users to rate their songs and view the top songs from friends. All queries must complete in four seconds or less.

Which approach would meet the response time requirement with minimal overhead?

  1. Java class that uses JDBC with embedded SQL

  2. Java class that uses an optimized stored procedure

  3. JPA entity class with a lazy fetching strategy

  4. JPA entity class with an eager fetching strategy

Answer: B

Question No: 46

You are the architect of a JEE-based product that customers can configure to meet their own security requirements. You want to enforce basic without sacrificing customers ability to customize the product.

Which is the best method to support both requirements?

  1. Define base roles and users declaratively

  2. Define base roles and users programmatically

  3. Build a custom security service to handle authorization

  4. Customize the JRE sandbox model by using local variables

Answer: C

Question No: 47

You are the operations architect for a large online retailer. During peak times, your set of monitored applications exhibits non-reproducible errors. The data center is growing at 50% per annum, while your team headcount remains constant.

Which method would you use to implement an affective monitoring strategy?

  1. Use the Visitor pattern to collect per-JVM statistics and store them centrally.

  2. Use the Strategy pattern to encapsulate collection logic for each JVM.

  3. Use the Thread Tracker to monitor the JVMs directly.

  4. Use the Observer pattern to monitor each JVM directly.

Answer: D

Question No: 48

You are consulting with a team that has maintained several legacy database for years. They have reviewed the JPA spec and are wondering if the technology would offer benefits over this current SQL base.

Which statement identifies a risk of adopting JPA?

  1. JPA only works with well-known data models.

  2. JPA may be able to model every table as a class.

  3. JPA could render code that requires extensive SQL tuning to perform well.

  4. JPA’s query language relies on a container to manage the persistence layer.

  5. JPA doesn’t provides ACID semantics.

Answer: A

Question No: 49

Which two functions are essential parts of a service oriented architecture (SOA) infrastructure?

  1. The service provider, which executes business logic in a stateless fashion

  2. The service consumer, which accesses services from the service repository

  3. The service repository, which stores software component metadata

  4. The service broker, which delivers well-defined service-level agreements

  5. The service look-up facility, which provides a central resource for naming and access

Answer: A,C

Question No: 50

A business application that runs in an Enterprise JavaBeans (EJB) container must communicate with a transactional third-party service. The communication technology must allow changing service providers without changing the application’s business model.

Which technology would meet these requirements?

  1. Java Message Service

  2. Remote Method Invocation

  3. Simple Object Access Protocol

  4. Java Connector Architecture

  5. Java Business Integration

Answer: A

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