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State the Benefits of Bean Pooling in an EJB Container
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q The cost of creating and destroying an EJBObject can be expensive, so the
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concept of pooling is used to share the resources among multiple users.
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q The external deployment descriptor specifies the number of instances to pool
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and reuse.
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q This pool allows the application server to handle more requests, since the
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server does not have to spend time creating and destroy EJBObjects.
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7: Enterprise JavaBeans and the EJB Container Model
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State the Benefits of Passivation in an EJB container
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q Passivation allows the EJB container to make the best possible use of server
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resources by passivating a bean to free up resources and then reactivating it when resources are available.
Explain How the Enterprise JavaBeans Container Does Life Cycle Management and Has the Capability to Increase Scalability
q In the EJB container s life cycle management, while the container handles
naming, management, transactional integrity, security, and persistence for the bean developer, the architect needs to determine the settings to tell the container how these concepts apply to a specific bean. This provides greater scalability.
q The mechanism for creating the deployment descriptors varies from
application server to application server, but they all contain the same basic information.
Self Test
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all the choices carefully because there might be more than one correct answer. Choose all correct answers for each question.
List the Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component
1. Which of the following is not true about Enterprise JavaBeans (prior to EJB 3.0) objects A. The home interface is responsible for locating or creating instances of the desired bean and returning remote references. B. The remote interface, or the EJBObject interface, typically provides method signatures for business methods. C. The bean implements either the EntityBean interface or the SessionBean interface but need not implement all the methods defined in the remote interface. D. The bean must implement one ejbCreate() method for each create() method in the home interface. 2. Which of the following is true about Enterprise JavaBeans (EJB 3.x) objects A. The home interface is no longer required. B. The remote interface, or the EJBObject interface, typically provides method signatures for business methods. C. The bean class implements the EJBInterface class. D. The bean must be defined in the XML deployment descriptor.
Distinguish Between Session and Entity Beans
3. Which statement is not true when contrasting the use of entity beans and JDBC for database operations A. Entity beans represent real data in a database. B. The bean managed entity bean functionally replaces the JDBC API. C. The container-managed entity bean automatically retrieves the data from the persistent storage (database). D. When using JDBC, you must explicitly handle the database transaction and the database connection pooling.
7: Enterprise JavaBeans and the EJB Container Model
Recognize Appropriate Uses for Entity, Stateful Session, and Stateless Session Beans
4. Suppose that the business logic of an existing application is implemented using a set of CGI programs. Which Java technologies can be used to implement the CGI programs as a Java-based solution A. JMAPI B. Screen scrapers C. Enterprise JavaBeans D. Servlets
Distinguish Between Stateful and Stateless Session Beans
5. Which of the following is not true about Enterprise JavaBeans (prior to EJB 3.0) session bean objects A. A session bean can be defined without an ejbCreate() method. B. Stateful beans can contain multiple ejbCreate() methods as long as they match the home interface definition. C. The home interface of a stateless session bean must include a single create() method without any arguments. D. The stateless session bean class must contain exactly one ejbCreate() method without any arguments.
State the Benefits and Costs of Container-Managed Persistence
6. If you try to create an (prior to EJB 3.0) CMP-based entity bean for a table that does not have a primary key, which of the following statements is not true A. You cannot create CMP entity beans without a database primary key. B. Duplicate records may be entered in the table. C. You can create CMP entity beans without primary keys, but the findByPrimaryKey() method will be unreliable. 7. Can you update the primary key field in a CMP entity bean (prior to EJB 3.0) A. No; you cannot update the primary key field in a CMP entity bean. B. Yes; you can update the primary key field in a CMP entity bean by using accessor methods for the primary key cmp-fields in the component interface of the entity bean. C. Yes; you can update the primary key field in a CMP entity bean by calling ejbStore().
Self Test
State the Transactional Behavior in a Given Scenario for an Enterprise Bean Method with a Specified Transactional Attribute as Defined in the Deployment Descriptor
8. In an application with several stateless session Enterprise JavaBeans (prior to EJB 3.0), in terms of performance ramifications of storing the remote reference to a stateless session bean, which of the following statements is least accurate A. You can cache the stateless session bean reference using the EJBObject.getHandle(). B. You can use the handle (SSB reference) when attempting to access the bean from here on. C. The cost for a remote lookup on a stateless session bean is insignificant and generally does not justify using a handle (SSB reference) to access the bean. D. The stateless session bean has no concurrency problems that is, there is no shared data to be corrupted.
Given a Requirement Specification Detailing Security and Flexibility Needs, Identify Architectures That Would Fulf ill Those Requirements
9. Which distributed object technology is most appropriate for systems that consist entirely of Java objects A. RMI B. CORBA C. DCOM D. DCE 10. Which distributed object technology is most appropriate for systems that consist of objects written in different languages and that execute on different operating system platforms A. RMI B. CORBA C. DCOM D. DCE 11. Which of the following are used by Java RMI A. Stubs B. Skeletons C. ORBs D. IIOP
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