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Home Oracle 1z0-807

Oracle 1z0-807 Exam Practice Questions (P. 5)

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Question #21
Which three web applications work best when they are designed to be server-push enabled?
  1. A
    A news feed used for providing users with frequently updated news content
  2. B
    A web chat that allows users to communicate using easily accessible web interfaces
  3. C
    A live sporting event application, used to deliver current results during matches
  4. D
    An auction system that provides users with live online bidding
  5. E
    A graphics rendering application that generates visuals in an orderly fashion

Correct Answer:
ABD

Question #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. A
    XML
  2. B
    JSON
  3. C
    RMI
  4. D
    JAX-RS
  5. E
    JAX-WS

Correct Answer:
BD

Question #23
Which are the objectives of the Strategy pattern? (Choose Two)
  1. A
    To provide a way to configure a class with one of many behaviors
  2. B
    To define an object that encapsulates how a set of objects interacts
  3. C
    To define the skeleton of an algorithm, deferring some steps to subclasses
  4. D
    To decouple an abstraction horn its implementation so that the two can vary independently
  5. E
    To define a family of algorithms, encapsulate each one, and make them interchangeable
  6. F
    To allow subclasses to redefine certain steps of an algorithm without changing the algorithm's structure

Correct Answer:
AE

Question #24
You need to restrict access to the administration screens in your website.
Which two techniques test a user's permissions before granting access to a particular screen?
  1. A
    Enterprise JavaBeans (EJB) entity
  2. B
    Servlet filter
  3. C
    Custom tag library
  4. D
    Deployment descriptor
  5. E
    Custom JavaScript in JSP

Correct Answer:
BD

Question #25
A company is extending its 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 companys requirements?
  1. A
    Send the notification inline, that is, within the normal HTTP request-response cycle.
  2. B
    Place messaging on a Java messaging Service (JMS) queue and use message-driven beans (MDBs) to create and send notifications.
  3. C
    Insert the messages into a database and use plain old Java Objects (POJOs) to read the messaging using JDBC and send notifications.
  4. D
    Insert the messages into a database and use entity beans to read the messages using JDBC and send notifications.

Correct Answer:
B

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