Oracle 1Z0-807 問題集

質問 1：
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. Leaky Abstraction
B. Hot Potato
C. Golden Hammer
D. Cache less Cow
正解：B

質問 2：
You are the lead technical designer for a new B2C retail application. A key goal is to minimize design and build complexity in order to maximize speed to market.
Which three features of JPA make it the most appropriate technology to use in building the persistence layer of the application?
A. JPA ensures thread safe semantics
B. JPA does not require an EJB container
C. JPA provides vendor-neutral database access
D. JPA ensures optimal database access logic
E. JPA provides transparent scalability
F. JPA provides ACID semantics
正解：B,C,F

質問 3：
A company provides call center support for corporations world-wide. Each agent in the call center can be assigned to multiple call center customers. All the company's customers use Windows based user interfaces and it has Just signed a new customer that uses a Java EE back end and wants a rich interface.
The company is developing a user interface for the new customer with the following requirements:
-Customer service representatives (CSRs) must be able to work with minimal training on the
application. -CSRs must be able to switch between call center systems quickly. -Screens must have awindows look and feel. -2000 agents spread across four locations must be able to use the system.
Which recommendation would you make to this company about the user interface (UI)?
A. Write the UI using JSP and JSTL.
B. Write the UI using AJAX, Accessing servlets directly.
C. Write the UI usingJava Swingand describe using JNLP.
D. Write the UI using JSPs with embedded script lets.
正解：C

質問 4：
Your consulting company has been asked to enhance an existing application. The current application is a two-tier system in which all the business logic is located in thick clients. You are considering a solution that would involve moving the business logic into the server's database In the form of stored procedures.
Which statement is an expected outcome of your proposed solution?
A. It will, in effect, turn the application into a three-tier system.
B. It will improve the manageabilityof the system.
C. It will improve the scalability of the system.
D. It will recline the amount of traffic on the network.
正解：B

質問 5：
You are the architect of a web application that uses javaServer Faces (JSF) as a presentation tier;
and for business processes coded as stateless session beans. When you add new code to the stateless session beans to address new accounting requirements, without changing the interface, you discover that the new business processes are being ignored by some of the JSF components.
What might be the cause of this problem?
A. The browser is caching out-of-date versions of the JSF components.
B. The business processes are not rigorously encapsulated in the session beans.
C. The presentation tier is relying on validation logic in the business tier.
D. The new session beans have been deployed incorrectly, and proper deployment will resolve the problem.
正解：B

質問 6：
Which three web applications work best when they are designed to be server-push enabled?
A. A web chat that allows users to communicate using easily accessible web interfaces
B. An auction system that provides users with live online bidding
C. A live sporting event application, used to deliver current results during matches
D. A graphics rendering application that generates visuals in an orderly fashion
正解：A,C,D

質問 7：
You have been recruited by an online retailer of footwear to conduct a review of their online systems. Your primary Finding is that the development team has implemented duplicated complex
business logic as Java scripts directly into the JSPs, causing performance, scalability, and maintainability issues.
Which two design patterns would you select to improve the current code base?
A. Composite View
B. View Helper
C. From Controller
D. Business Delegate
E. Service-to-Worker
正解：C,E