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Sample Java Language Annotations Used in EJB 3.0
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@Entity @MessageDriven @Stateful @Stateless @EJB @PostConstruct, @PreDestroy, @PostActivate, @PrePassivate @Resource
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Specifies an entity bean component. Specifies a message-driven bean component. Used to annotate a class as a stateful session bean component. Used to annotate a class as a stateless session bean component. Used on the client to reference the business interfaces of other beans and for EJB 2.1 or older beans, the home interfaces. All used to annotate a life cycle event callback method. Used for resource injection, examples are: int, SessionContext, DataSource, QueueConnectionFactory, Queue Declare method permissions. The principal identity the enterprise bean will use when it makes calls. Specifies a time-out method on a component that uses container-managed timer services. Applies a transaction attribute to all methods of a business interface or to individual business methods on a bean class. Can be MANDATORY, REQUIRED, REQUIRES_NEW, SUPPORTS, NOT_SUPPORTED, NEVER. (Continued)
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@RolesAllowed, @PermitAll, @DenyAll @RunAs @Timeout @TransactionAttribute
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7: Enterprise JavaBeans and the EJB Container Model
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Sample Java Language Annotations Used in EJB 3.0
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@TransactionManagement @Column @Id @JoinColumn @ManyToMany @ManyToOne @OneToMany @OneToOne @PersistenceContext @PersistenceUnit @SecondaryTable @SecondaryTables @Table @UniqueConstraint
Description
Declares whether a bean will have container-managed (CONTAINER) or bean-managed (BEAN) transactions. Specifies a mapped column for a persistent property or field. Specifies primary key for an entity. Specifies a mapped column for joining an entity association. Defines a many-valued association with many-to-many multiplicity. Defines a single-valued association to another entity class that has a many-to-one relationship. Defines a many-valued association with a one-to-many relationship. Defines a single-valued association to another entity that has a one-to-one relationship. Used to inject a dependency on an EntityManager. Used to inject a dependency on an EntityManagerFactory. Used to specify a secondary table, which indicates that the data for the entity class is stored across multiple tables. Specifies multiple secondary tables for an entity. Specifies the primary table for the entity. Used to specify that a unique constraint is to be included in the generated DDL for a primary or secondary table.
For more information with respect to EJB 3.0 (JSR 220), look at the specification documents on the Java Community Process web site at
http://jcp.org/en/jsr/detail id=220
In the download section of the preceding web site link, the following documents can be located: 1. Enterprise JavaBeans 3.0 Final Release (ejbcore) 3. Enterprise JavaBeans 3.0 Final Release (simplified) ejb-3_0-fr-spec-ejbcore.pdf ejb-3_0-fr-spec-simplified.pdf
2. Enterprise JavaBeans 3.0 Final Release (persistence) ejb-3_0-fr-spec-persistence.pdf
List the Required Classes/Interfaces
These specification documents are fairly large, but it makes sense to give them a read at some point before taking the exam. This chapter covers two versions of the EJB specification, namely 3.0 and prior to 3.0. This book contains material that covers multiple versions of the examination, so it is important that you know which version you will be taking in order to concentrate on the correct answers for the exam objectives. Within the text of this chapter, when necessary we will differentiate between the two specifications by marking them with a notation of either EJB 3.0 or prior to EJB 3.0.
CERTIFICATION OBJECTIVE 7.01
List the Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component
Here, we review the component architecture of EJBs. We also cover the required classes and interfaces for EJB, which include the home and remote interfaces, the XML deployment descriptor, the business logic (bean) class, and the context objects. While these names may or may not be meaningful to you at this point, you will soon understand how each of these pieces fits into the EJB component model.
Classes and Interfaces Prior to EJB 3.0
The components used to create and access EJBs facilitate the creation and execution of business logic on an enterprise system. Each EJB session and entity bean must have the following classes and interfaces:
n Home (EJBHome) interface n Remote (EJBObject) interface n XML deployment descriptor n Bean class n Context objects
Home (EJBHome) Interface (Prior to EJB 3.0)
The EJBHome object provides the life cycle operations (create(), remove(), find()) for an EJB. The container s deployment tools generate the class for the
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