Oracle Oracle Certifications 1Z0-807 Questions & Answers

• Question 21:

  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. It allows you to replace Inheritance with composition.

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

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

  Correct Answer: CE

• Question 22:

  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 a windows 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 JSPs with embedded script lets.

  C. Write the UI using AJAX, Accessing servlets directly.

  D. Write the UI using Java Swing and describe using JNLP.

  Correct Answer: D

• Question 23:

  Which two use cases are best suited to the RPC style of messaging using Simple Object Access Protocol (SOAP)?

  100% Real QandAs | 100% Real Pass

  A. Processing large sized communication messages

  B. Implementing line grained services

  C. Validating custom data types

  D. Implementing asynchronous web services

  E. Executing long running multi-part processes

  Correct Answer: BC

• Question 24:

  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)

  Correct Answer: A

• Question 25:

  Which two measures are most effective in protecting websites from cross site scripting (XSS) attacks?

  A. Escape "<" and ">" parameters that displayed or evaluated by the JavaScript interpreter.

  B. URL-encode "<" and ">"parameters so they will never be evaluated by the JavaScript Interpreter.

  C. Ensure that the session cookie is sent only on UTTPS connections.

  D. Treat all user-supplied input as unsafe, and white list known good characters

  E. Execute all user-supplied scripts in a server-side sandbox.

  Correct Answer: CE

• Question 26:

  You are the architect at ACME, a large a large global retailer of festival and holiday accessories. ACME wants to launch a new shopping portal for the holiday shopping session, allowing two months from project inception to going live. The portal must contain in-house and third-party stock to attack customers.

  Fast response times are also critical so users remain engaged and sticky to the portal.

  What would you recommend to the ACME project team to deliver this project?

  A. Access all third party content using JSONP to dynamically load it from the browser.

  B. Access as much content with bulk-loading as possible; use JSONP to access the remainder.

  C. Access all content regardless of source using the HTML 5 XML parsing capabilities of the browser

  D. Access all third party content using JSON to dynamically load it from the browser.

  Correct Answer: A

• Question 27:

  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?

  100% Real QandAs | 100% Real Pass

  A. JPA ensures thread safe semantics

  B. JPA ensures optimal database access logic

  C. JPA does not require an FJB container

  D. JPA provides vendor-neutral database access

  E. JPA provides ACID semantics

  F. JPA provides transparent scalability

  Correct Answer: CDE

• Question 28:

  You are the architect of an application that reads from and writes to multiple systems. The application must participate in an existing transaction to update a database using JDBC, and also invoke a transactional method on a remote system as part of the same transaction. Which two technologies would you suggest, to access remote system, for this application?

  A. Java Connector Architecture (JCA)

  B. java Message Service (JMS)

  C. Remote Method Invocation (RMI)

  D. Simple Object Access Protocol (SOAP)

  Correct Answer: AC

• Question 29:

  You are contracted to improve the performance of an application.

  While analyzing the application, you observe the following issues: Tight coupling between client and business objects

  Too many remote method Invocations between client and server

  Which design pattern is best suited to improving performance?

  A. Web Service Broker

  B. Value List Handler

  C. Data Access Object

  D. Service Activator

  Correct Answer: B

• Question 30:

  Which two types of applications benefit from using JavaServer Faces (JSF)?

  A. An application with a customizable UI skin

  B. An application that implements access control on each action based on user role.

  C. An application in which type conversion of the values of UI components is implemented only in Java classes.

  D. An application that sets specific database validation listeners on a UI component

  Correct Answer: CD