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These elements declare the internal structure and external dependencies of EJB components. The descriptor defines, among other things, the EJB class names, the JNDI namespace that represents the container, home interface names, and remote interface names. These elements describe how EJB components are to be integrated into larger applications. Some of the application assembly elements describe environment values, security roles, and transaction attributes.
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Packaging Hierarchies An important attribute of the EJB specification is that it not only provides the programming interfaces but also defines how the component/ application has to be packaged. The deployment descriptor that has to go into the packaging is the standard way of customizing parameters of a specific installation.
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7: Enterprise JavaBeans and the EJB Container Model
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EJB components can be packaged as individual EJBs, as a collection of EJBs, or as a complete application system. EJB components are distributed in a JAR file called an ejb-jar file. The ejb-jar file contains Java class files, as well as home and remote interfaces for EJBs. It also contains the XML deployment descriptor for the EJB.
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Home and Remote Interfaces The client view is provided through the home interface and the remote interface. Classes constructed by the container when a bean is deployed, based on information provided by the bean, provide these interfaces. The home interface provides methods for creating a bean instance, while the remote interface provides the business logic methods for the component. By implementing these interfaces, the container can intercede in client operations of an EJB. This offers the client a simplified view of the component.
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If you have studied this chapter diligently, you should have an understanding of session and entity EJBs. You should also understand when it is appropriate to implement the different EJBs.
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TWO-MINUTE DRILL
List the Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component
q Prior to EJB 3.0, the required classes/interfaces that must be provided for an
EJB component are the home (EJBHome) interface, the remote (EJBObject) interface, business logic (bean) class, context objects, and the XML deployment descriptor. For EJB 3.0, the only required class is an annotated bean class. The business interface can be generated by default and the XML deployment descriptor is now optional and largely unnecessary for simple EJBs.
Distinguish Between Session and Entity Beans
q A session bean is an EJB that is created by a client and usually exists only for
the duration of a single client/server session.
q An entity bean is an object representation of persistent data maintained in
a permanent data store such as a database. A primary key identifies each instance of an entity bean.
Recognize Appropriate Uses for Entity, Stateful Session, and Stateless Session Beans
q Use stateful session beans for functionality that requires data to be maintained
across business logic method invocations.
q Use stateless session beans for functionality that does not require data to be
maintained across business logic method invocations.
Distinguish Between Stateful and Stateless Session Beans
q Stateful session beans maintain data (state) across business logic method
invocations.
q Stateless session beans do not maintain data (state) across business logic
method invocations.
q Stateless session beans can utilize the bean-pooling feature of the EJB
container.
7: Enterprise JavaBeans and the EJB Container Model
State the Benefits and Costs of Container-Managed Persistence
q The benefits of CMP include database independence and container-specific
features (such as full-text search). CMP has drawbacks, as only containersupported algorithms persistence can be used, and portability to other EJB containers may be lost.
State the Transactional Behavior in a Given Scenario for an Enterprise Bean Method with a Specified Transactional Deployment Descriptor
The following transactional behaviors can be identified for an enterprise bean method:
q In NotSupported [or @TransactionAttribute(NOT_SUPPORTED)
annotation in EJB 3.0] transactional behavior, existing transactions are suspended during method calls. An existing transaction is suspended until the method called in this bean completes.
q In Required [or @TransactionAttribute(REQUIRED) annotation in
EJB 3.0] transactional behavior, if an enterprise bean method already exists, it will be used. If one does not exist, it will be created.
q In Supports [or @TransactionAttribute(SUPPORTS) annotation
in EJB 3.0] transactional behavior, the container will not start a new transaction, but if a transaction already exists, the bean will be included in that transaction.
q In RequiresNew [or @TransactionAttribute(REQUIRES_NEW)
annotation in EJB 3.0] transactional behavior, a new transaction is always started when the bean method is called. If a transaction already exists, that transaction is suspended until the new transaction completes.
q In Mandatory [or @TransactionAttribute(MANDATORY) annotation in
EJB 3.0] transactional behavior, if a transaction does not exist, an exception is thrown.
q In Never [or @TransactionAttribute(NEVER) annotation in EJB 3.0]
transactional behavior, if a transaction exists, an exception is thrown.
q To encapsulate access to data, an application can use intermediate data
access objects.
q The benefits of bean pooling in an EJB container include lowered cost, specific
rates of pool reuse, and increased request handling by the application server.
Two-Minute Drill
Given a Requirement Specification Detailing Security and Flexibility Needs, Identify Architectures That Would Fulf ill Those Requirements
The following is a list of some of the considerations when dealing with questions for the preceding objective:
q For EJB systems, deciding on Container-Managed or Declarative Security
(flexibility) vs. Bean-Managed or Procedural Security (fine-grained approach)
q Which distributed object technology is most appropriate RMI, CORBA,
DCOM, or DCE
q Protocols supported in the deployed environment q Ability for object serialization for transporting across a network
Identify Costs and Benefits of Using an Intermediate Data Access Object Between an Entity Bean and the Data Resource
To encapsulate access to data, an application can use intermediate data access objects. The use of separate objects to access data results in the following:
q Keeps entity bean code clear and simple q Ensures easier migration to container-managed persistence for entity beans q Allows for cross-database and cross-schema portability q Provides a mechanism that supports tools from different vendors q Not useful for CMP entity beans q Adds an extra layer q Needs more class hierarchy design when using a factory strategy
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