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SCWCD Certification Practice Tests SCWCD Study Guide (CX-310-081)

 
 SCBCD Certification Practice Test  

Features Of CertGear's SCBCD (CX-310-090) Certification Practice Test

  • Learn As You Go - Detailed explanations tell you not just the right answer, but why the right answer is right and the wrong answers are wrong. References for further study are also provided.

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    Timed, Live scoring, Randomization, Ask Incorrect, Show Answer, Select # of questions.

  • Ask Only The Questions You Got Wrong - This is a great feature. At the end of the exam, instead of being asked every question again, you can tell the test engine to only ask you questions that you got incorrect.

  • Randomization - The tests in our certification mode are dynamic, not fixed like some other practice tests are, so you'll get a new test every time. Each test is timed and the objectives are weighted the same as on the real exam.

  • History - The test engine keeps a history of all the exams and scores you have achieved on those tests. You can easily track your progress and help determine when you are ready to take the actual exam.

  • Categories - Many tests contain categories for you to selectively study topics. Additionally, you can see your grade in each category at the end of the exam.

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Free SCBCD Certification Practice Questions:

Let's assume you are developing a shopping cart stateful session bean. In order to ensure the robustness of the shopping cart, you've decided that the shopping cart bean will temporarily store the shopping cart data into a database. This would allow a user to retrieve his cart data, even if your server crashes.

However, you would like to ensure that if the stateful session bean is ever "killed" by the container, the data in the database is explicitly removed. Which of the following approaches can be used?

A) Since the container is guaranteed to call ejbRemove () prior to removing a stateful session bean, add clean-up code in the ejbRemove () method of the bean to delete the shopping cart data from the database.

B) Since the container will call ejbPassivate () prior to passivating a stateful session bean, add clean-up code in the ejbPassivate () method of the bean to delete the data into database before a session bean is passivated by the container.

C) To ensure that the data in the database is always cleaned-up if the bean is ever "killed", add clean-up code in both the ejbRemove () and ejbPassivate() methods.

D) None of the methods will ensure that the data in the database will be cleaned-up when the shopping cart bean is 'killed'.

  • [ANS: D]

  • There are three different situations where a stateful session bean may be "killed" by the container without the container invoking the corresponding ejbRemove () method on the bean:

    1) A system exception is thrown within the session bean, during the invocation of a business method
    2) A passivated session bean times out due to inactivity
    3) The EJB server crashes
    As a result, adding clean-up code in the ejbRemove () and ejbPassivate () is NOT sufficient to guarantee that the data in the database will be removed when the stateful session bean ceases to exist.

    References: http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/EJBConcepts9.html


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