QB - Jayaram College of Engineering and Technology

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11. What are the different methods of Entity Bean An entity bean consists of 4 type of methods: create methods, finder methods, remove methods and home methods. 12. What is the difference between EJB and Java beans EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE. 13. What is EJB role in J2EE EJB technology is the core of J2EE. It enables developers to write reusable and portable server-side business logic for the J2EE platform. 14. What are the key benefits of the EJB technology 1. Rapid application development 2. Broad industry adoption 3. Application portability 4. Protection of IT investment 15. How many enterprise beans There are three kinds of enterprise beans: 1. session beans, 2. entity beans, and 3. Message-driven beans. 16. What is message-driven bean A message-driven bean combines features of a session bean and a Java Message Service (JMS) message listener, allowing a business component to receive JMS. A message-driven bean enables asynchronous clients to access the business logic in the EJB tier. 17. What is the difference between session and entity beans An entity bean represents persistent global data from the database; a session bean represents transient user-specific data that will die when the user disconnects (ends his session). Generally, the session beans implement business methods (e.g. Bank.transferFunds) that call entity beans (e.g. Account.deposit, Account.withdraw) Department of IT, JCET, Trichy. Page 12
18. How many EJB Objects are created for a Bean For a Session bean – one EJB object for one bean instance. For entity bean – it depends , if two users are accessing one row at time then one EJB object is used for both the beans other wise for each bean one EJB object. 19. What is EJB container An EJB container is a run-time environment that manages one or more enterprise beans. The EJB container manages the life cycles of enterprise bean objects, coordinates distributed transactions, and implements object security. Generally, each EJB container is provided by an EJB server and contains a set of enterprise beans that run on the server. 20. What is the difference between ejbCreate() and ejbPostCreate The purpose of ejbPostCreate() is to perform clean-up database operations after SQL INSERTs (which occur when ejbCreate() is called) when working with CMP entity beans. ejbCreate() is called before database INSERT operations. You need to use ejbPostCreate() to define operations, like set a flag, after INSERT completes successfully UNIT III BIG QUESTIONS 1. Explain Life Cycle of session bean with diagram. 2. Explain detail about Entity beans and its deployment. 3. (i) Draw the life cycle of entity bean and explain. (ii) List the constraints on using session beans. Department of IT, JCET, Trichy. Page 13
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QB - Jayaram College of Engineering and Technology

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