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7: Enterprise JavaBeans and the EJB Container Model
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12. Which of the following is not a tier of a three-tier architecture A. Client interface B. Business logic C. Security D. Data storage 13. Which of the following Java technologies implements transaction management A. RMI B. JTS C. JMAPI D. JTA 14. Which of the following is not true when discussing application servers and web servers A. A web server understands and supports only the HTTP protocol. B. An application server supports HTTP, TCP/IP, and many more protocols. C. A web server does not support caching, clustering, and load balancing. D. We can configure application servers to work as web servers. 15. Which statement is not true when discussing serialization in EJB A. Serialization means that a machine A s object passed as part of a method call is flattened into a byte stream that can be sent over a network connection. B. All EJB methods arguments and return values must be serializable. C. Developers should make sure all objects passed as arguments implement java.io.Serializable. D. Serialization is not possible in EJB.
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16. Which of the following are true about EJB components, containers, and application servers A. Components run in containers. B. Containers are hosted by application servers. C. Containers run in components. D. Application servers run in containers. 17. Which objects would you find in an Enterprise JavaBeans (prior to EJB 3.0) directory service A. An EJB home interface B. An EJB component
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C. The EJB API D. An EJB object interface 18. Containers and servers have the same function. What is the difference between an Enterprise JavaBeans container and an Enterprise JavaBeans server A. Containers run within servers. B. Servers run within containers. C. Only one server can run in a container. D. Only one container can run in a server. 19. Which of the following Enterprise JavaBeans (prior to EJB 3.0) CMP entity bean methods are used by the container to alert the bean when its state is synchronized with the database A. ejbLoad() B. ejbStore() C. ejbCreate() D. ejbActivate() 20. What happens if remove() is not invoked on a stateful Enterprise JavaBeans (prior to EJB 3.0) session bean A. Nothing happens; the bean will last forever. B. The container will not honor any more requests for the bean. C. An exception occurs in the session bean. D. The bean is removed after the session time-out has been reached. 21. With respect to stateful Enterprise JavaBeans (prior to EJB 3.0) session beans, which of the following statements is not true A. Stateful session beans support instance pooling. B. The life cycle of a stateful session bean is strictly connected with its client. C. When the client removes the bean, it cannot be used by another client without being reinitialized. D. A stateful session bean has three states: Does not exist, Method Ready, and Passivated.
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7: Enterprise JavaBeans and the EJB Container Model
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3 1. C is correct for Enterprise JavaBeans (prior to EJB 3.0). The bean or enterprise bean is not the EJB object. It extends either the EntityBean interface or the SessionBean interface. It must implement all the methods defined in the remote interface. A, B, and D are incorrect because the EJBObject or remote object is a wrapper residing inside the container, between the client and the code. It performs setup and shutdown tasks pre and post bean call. The EJBObject is generated by the EJB server tools. The developer must write another interface, called the remote interface or the EJBObject interface, that extends the interface EJBObject and provides method signatures for all the business methods. The server automatically generates a Java class that implements the remote interface. The home interface is a factory object responsible for locating and creating instances of the bean. The developer must code for the EJBHome interface (that is, extend the interface EJBHome), and provide method signatures for all the desired create() and find() methods. 3 2. A is correct for Enterprise JavaBeans (EJB 3.x). The home interface is no longer required. B, C, and D are incorrect because the remote interface is no longer required, the bean class does not have to implement the methods of any interface, especially a nonexistent one (EJBInterface), and the XML deployment descriptor entries for an EJB are now optional.
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