Oracle 1Z0-807 Online Practice Questions and Exam Preparation

Oracle 1Z0-807 Online Questions & Answers

• Question 41:

  Which three web applications work best when they are designed to be server-push enabled?

  A. A news feed used for providing users with frequently updated news content
  B. A web chat that allows users to communicate using easily accessible web interfaces
  C. A live sporting event application, used to deliver current results during matches
  D. An auction system that provides users with live online bidding
  E. A graphics rendering application that generates visuals in an orderly fashion
  B. A web chat that allows users to communicate using easily accessible web interfaces
  C. A live sporting event application, used to deliver current results during matches
  D. An auction system that provides users with live online bidding

• Question 42:

  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?

  A. Enterprise JavaBeans (EJB) entity
  B. Servlet filter
  C. Custom tag library
  D. Deployment descriptor
  E. Custom JavaScript in JSP
  B. Servlet filter
  D. Deployment descriptor

• Question 43:

  Oasis Corporation has decided to develop a single Instance multi-tiered application with its existing EIS resources. You are the technical lead for the Integration team responsible for providing the following: A common Interface that can easily access the heterogeneous EIS resources

  

  Generic transaction mechanism support for EIS resource managers

  

  A connection pool to legacy EIS resources

  

  Which two technologies would you use to meet these requirements?

  A. JMS
  B. JDBC
  C. JCA
  D. JAX-WS
  E. JAX-RS
  B. JDBC
  C. JCA

• Question 44:

  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.
  C. It allows you to replace Inheritance with composition.
  E. It always requires that at least two objects are involved in handling a request.

• Question 45:

  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 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
  C. JPA does not require an FJB container
  D. JPA provides vendor-neutral database access
  E. JPA provides ACID semantics

• Question 46:

  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.
  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.

• Question 47:

  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. 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. The container has a well defined lifecycle model for each EJB type.
  B. The container provides a transparent scaling mechanism to handle spikes in demand.
  D. The container has a well defined lifecycle model for each EJB type.

• Question 48:

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

  A. Escape "" parameters that displayed or evaluated by the JavaScript interpreter.
  B. URL-encode ""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.
  C. Ensure that the session cookie is sent only on UTTPS connections.
  E. Execute all user-supplied scripts in a server-side sandbox.

• Question 49:

  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)
  A. Java Connector Architecture (JCA)
  C. Remote Method Invocation (RMI)

• Question 50:

  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
  A. Strategy