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1z0-807 Practice Exam Questions with Answers Java EE 6 Enterprise Architect Certified Master Exam Certification

Question # 6

Your company provides a marketplace for industrial chemicals. You are required to offer accurate pricing and quantities to all marketplace users.

Marketplace users are globally distributed.

What is the most appropriate technology to use to satisfy this requirement?

A.

Server-side distribution using JAX-WS

B.

Client-side polling using JAX-RPC

C.

Web services using REST

D.

An enterprise messaging system

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Question # 7

Your company has decided to expose a set of business operations through an API so that clients can access them remotely. These operations, which are modeled as methods on a stateless session bean component, act as building blocks for complex state-changing activities that need to possess atomicity,, consistency, isolation and durability (ACID) semantics.

Select the best technology to implement the API.

A.

Remote Method Invocation (RMI)

B.

Java Message Service (JMS)

C.

XML over HTTP

D.

Java Connector Architecture (JCA)

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Question # 8

Which two statements are true about delegation as an Object-Oriented Design technique?

A.

It is applied to a system only at compile time.

B.

It is an essential element of the Singleton pattern.

C.

C. It allows you to replace Inheritance with composition.

D.

In Java technology, it is always implemented through the use of generics.

E.

E. It always requires that at least two objects are involved in handling a request.

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Question # 9

Which three actions restrict the ability of a web application to scale in response to load

as additional computing resources are made available to it?

A.

B.Implementing corebusinesslogic in the web tier

B.

Implementing core business logic using stateless session beans

C.

Storing users' session state in a database

D.

E.Maintaining users' session state by usingstatefulsession beans

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Question # 10

The integration team has reported a problem in testing a few deployed MDBs. By design, each MDB listens to one of four named queues. Two producers write messages to each queue. The test issues messages of the same payload type that each producer will send, but varies the number or size of these messages to measure the messaging server’s performance.

The team has noticed that the utilization remains at the same high rate any time the test writes messages destined for the third MDB. The message server log does not reveal any failure in sending messages to this MDB. Which anticipation expresses cause for this condition?

A.

Hot Potato

B.

Leaky Abstraction

C.

Cache less Cow

D.

Golden Hammer

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Question # 11

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

A.

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

B.

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

C.

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

D.

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

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Question # 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?

A.

Composite View

B.

B. Leaky Abstraction

C.

Asynchronous Interaction

D.

Golden Hammer

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Question # 13

An investment company has purchased a number of small online business referral systems that appeal to various niche demographics. The company wants to bring these networks together in hopes of finding a broad, single theme and brand image for these groups before they can do that, they need to get the users communicating with outside their current networks.

Which Web Services pattern would you recommend they consider in building a scheme to accommodate this communication?

A.

Asynchronous Interactions

B.

PAOS Interactions

C.

Web Services Broker

D.

JMS Bridge

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