Oracle Oracle Certifications 1Z0-807 Questions & Answers

• Question 51:

  You are the architect of a web application that uses javaServer Faces (JSF) as a presentation tier for business processes coded as stateless session beans. When you add new code to the stateless session

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  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 presentation tier is relying on validation logic in the business tier.

  B. The browser is caching out-of-date versions of the JSF components.

  C. The business processes are not rigorously encapsulated in the session beans.

  D. The new session beans have been deployed incorrectly, and proper deployment will resolve the problem.

  Correct Answer: C

• Question 52:

  Your company uses a payroll application that was developed using Java technologies. The company has acquired another company and plans to integrate its payroll process in existing application. You have been asked to implement this integration. You observe that the business logic adopted to calculate the payroll is different in both companies.

  Which design pattern would be most appropriate to use in this integration?

  A. Strategy

  B. Payload Extractor

  C. Fly Weight

  D. Composite

  E. Service Locator

  Correct Answer: A

• Question 53:

  Which two are significant advantages of developing web applications with JavaServer Faces (JSF)?

  A. JSF pages can be previewed outside the web container.

  B. Backing beans can be unit tested outside the web container.

  C. Client-side validation mechanisms are automatically generated.

  D. JSF pages can be integrated with AJAX.

  Correct Answer: CD

• Question 54:

  Which two statements are true about the timer service of a business component container?

  A. Timed notifications for all types of session beans can be scheduled by using this service.

  B. When the server is shut down, the timer is persisted automatically and becomes active again when the server is restarted.

  C. Each instance of message driven beans has unique timers.

  D. When stateful session bean instance is removed, the container detaches the timers associated with the instance and allocates them to the new instance.

  E. When a transaction is rolled hark, the timer creation within the transaction is also rolled back.

  Correct Answer: BE

• Question 55:

  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. Implementing the Singleton pattern in the web tier

  B. Implementing core business logic in the web tier 100% Real QandAs | 100% Real Pass

  C. Implementing core business logic using stateless session beans

  D. Storing users' session state in a database

  E. Maintaining users' session state by using stateful session beans

  Correct Answer: ABE

• Question 56:

  Which type of application would benefit from using the Singleton pattern?

  A. An application that interacts with external systems in serial fashion.

  B. An application that interacts with external systems in parallel fashion.

  C. A clustered application that can support 200 concurrent users.

  D. An application that requires remote monitoring capabilities

  Correct Answer: A

• Question 57:

  You are conducting a security audit for a web application that uses URL rewriting. The application does not allow for user-generated content and is accessible only via secured VPN.

  Which two security threats would you prioritize in your audit?

  A. SQL injection

  B. Cross-site scripting

  C. Parameter-site manipulating

  D. Session hijacking

  E. Denial-of-service attacks

  Correct Answer: CD

• Question 58:

  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?

  A. Use JPA in the web tier only.

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

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

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

  Correct Answer: AC

• Question 59:

  Which three statements are true about inheritance?

  A. Inheritance helps to reuse existing code implementations.

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

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

  D. Inheritance promotes encapsulation better than interfaces.

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

  Correct Answer: ABC

• Question 60:

  Blue Berry Corporation, one of the biggest fruit traders in Canada, has the biggest competitor, Red Cherry

  100% Real QandAs | 100% Real Pass 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?

  A. JMS

  B. JCA

  C. XML over HTTPS

  D. RMI over IIOP

  E. JBI

  Correct Answer: CE