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Java EE 6 Enterprise Architect Certified Master Exam

Question No: 11

While analyzing an existing web application, you observe the following issues in the source code:

->Duplicate control code is scattered throughout various view.

->Business and presentation logic are mixed within these view.

The next phase of the project involves refactoring the existing code to address these two issues.

Which design pattern, if employed in the refactoring exercise, would most directly address the two issues?

  1. Service to Worker

  2. Dispatcher view

  3. DAO

  4. Composite View

Answer: A

Reference: http://www.vincehuston.org/j2ee/corepatterns.html (see ‘service to worker’)

Question No: 12

You are using an open source integration framework in your project. However, key interfaces do not explicitly define several strange conditions you have repeatedly seen while testing.

Which option is the name given to the anti pattern described above?

  1. Composite View

  2. Leaky Abstraction

  3. Asynchronous Interaction

  4. Golden Hammer

Answer: B

Explanation: All non-trivial abstractions, to some degree, are leaky.

An abstraction that works most of the time, but where a detail of the underlying complexity cannot be ignored, thus leaking complexity out of the abstraction back into the software that uses the abstraction.

Question No: 13

Which two statements are true about security strategies at the message level?

  1. Messages are secured during transport and after arrival at their destination

  2. Each portion of a compound message is secured.

  3. SSL is required to ensure authenticity, integrity, and confidentiality.

  4. Message attachments are secured without the need for a dedicated API.

  5. Security is dependent on the application environment or the transport protocol.

Answer: A,D

Question No: 14

Which two features are supported by the Java Authentication and Authorization Service (JAAS) API?

  1. Single sign on

  2. Secure network connections

  3. Configurable access control policies

  4. Web services security

  5. Message encryption and key generation

Answer: A,C

Question No: 15

Your development team wants to use Google Guice. A previous architect assigned this request a low priority, citing the complexity of integration and no compelling benefits statements from the requesting team.

The team claims that their colleagues have achieved the integration using a pattern. This pattern reduced the level of difficulty and risk and did not require vendor support.

Which pattern fits this description?

  1. Context Holder

  2. Service Starter

  3. Dependency Injection Extender

  4. Bean Locator

Answer: C

Reference: https://code.google.com/p/peaberry/

Question No: 16

Which statements are true about Java integration technologies?

  1. Remote Method Invocation (RMI) helps to connect subsystems in a loosely coupled manner.

  2. Java Message Service (JMS) helps in synchronous messaging between Java and non- Java systems.

  3. JMS helps to broadcast messages to multiple Java-based receivers.

  4. Java Connector Architecture (JCA) helps to integrate with heterogeneous legacy enterprise information systems.

Answer: C

Question No: 17

A travel company re-architects its application from a two-tier to a three-tier architecture. To see what impact the new architecture has on its non-functional requirements (NFR), the company intends to build a prototype based on the new architecture.

The company compares the NFR metrics associated with the new prototype against the metrics from their original two-tier solution.

Which option is an advantage of the original two-tier solution?

  1. It has better availability because it has fewer single points of failure.

  2. It has better manageability because each client has its own copy of the application.

  3. It has better performance because each client must use its own set of domain objects.

  4. It has better scalability because each client can access the database independently of other clients.

Answer: A

Question No: 18

Which two statements describe the contact between an Enterprise JavaBeans (EJB) container and the EJBs that it hosts?

  1. The container provides automatic logging of all exceptions and errors generated by EJB code.

  2. The container provides a transparent scaling mechanism to handle spikes in demand.

  3. An EJB can extend its services, such as security, to improve performance.

  4. The container has a well defined lifecycle model for each EJB type.

Answer: B,D

Question No: 19

What are two consequences of using the Composite View pattern?

  1. Improves performance

  2. Avoids duplicate content

  3. Forces a whole-part dependency

  4. Allows tables to be reused in multiple locations

  5. Restricts all sub views to have a consistent view technology

Answer: B,D

Question No: 20

Which option describes the design relationship between session beans and entity beans?

  1. Aggregation

  2. Separation of concerns

  3. Common reuse principle

  4. Liskov substitution principle

  5. Interface segregation principle

Answer: B

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