birt barcode tool Local interface for the UserBean CMP in Java

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Listing 14.4 Local interface for the UserBean CMP
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public interface User extends EJBLocalObject { String getUserId(); String getFirstName(); void setFirstName(String firstName); String getLastName(); void setLastName(String lastName); String getUserType(); void setUserType(String userType); Date getBirthDate(); void setBirthDate(Date birthDate); Long getUserBillingId(); void setUserBillingId(Long userBillingId); ... Collection getBids(); void setBids(Collection bids); }
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Get/set methods for persistence fields
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Get/set methods for relationship fields
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If you haven t used a DTO, we recommend you start with the local interface as the basis for creating your entity class. The home interface in the entity bean serves as the factory method to create, remove, and query bean instances. You can remove the home interface and migrate your finder methods to named queries, as we discuss later in the section. The create and remove methods are replaced with EntityManager operations. Optionally, you can migrate the home interface to be used as a session fa ade that exposes all factory methods such as create and remove to minimize the impact on client applications. We ll discuss this in section 14.4.4.
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Migrating CMP 2 entity beans to the EJB 3 JPA
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Identifying the primary key Like the persistence fields, the primary key for CMP 2 is defined in the deployment descriptor. For example, the primary key for the UserBean entity bean is defined in the deployment descriptor as follows:
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... <prim-key-class>java.lang.String</prim-key-class> <reentrant>false</reentrant> <cmp-version>2.x</cmp-version> <abstract-schema-name>User</abstract-schema-name> <cmp-field> <field-name>userId</field-name> </cmp-field> ... <primkey-field>userId</primkey-field> ...
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You identify the primary key of the entity class in EJB 3 using the @Id annotation:
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@Id private String userId;
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CMP 2 did not support the automatic generation of primary key values; this required the use of workarounds such as the Sequence Generator pattern, or vendor-specific extensions to either database sequence or table sequence generators. If you happened to use such features, then you must migrate them to one of the primary key generation strategies that we discussed in chapter 8.
Creating O/R mapping The ORM metadata such as table and column mapping for EJB 2 entity beans is defined in the vendor-specific deployment descriptor. Move those mappings to entity classes by using the @Table and @Column annotations, as discussed in chapter 8. Optionally, you can move them to an OR mapping file, as discussed in chapter 11. Lifecycle methods EJB 2 required you to implement a lot of lifecycle methods a lot. These methods are template methods and are rarely used. It s possible that you may have implemented some business logic in these methods. You can migrate the business logic for the lifecycle methods to the entity listener callback methods discussed in chapter 9. Table 14.5 summarizes the methods that you can migrate from EJB 2 lifecycle methods to entity callback methods in EJB 3.
Migrating to EJB 3
Table 14.5 EJB 2 required implementations of many lifecycle methods. EJB 3 allows you to define lifecycle callback methods. This table lists the corresponding methods for EJB 3 JPA that you can use to migrate an entity bean s lifecycle methods. EJB 2 Lifecycle Method ejbCreate ejbPostCreate ejbRemove setEntityContext, unSetEntityContext ejbActivate, ejbLoad ejbPassivate ejbStore Migrated EJB 3 JPA Entity Constructors in the entity class. A method annotated with @PostPersist. A method annotated with @PreRemove. EntityContext is not supported in EJB3 JPA. Candidate for removal. A method annotated with @PostLoad as per the application requirement. Candidate for removal. A method annotated with either @PrePersist or @PreUpdate depending on the application requirement.
If you re like us, you welcome the move away from all these required lifecycle methods. It s long overdue! Finding an alternative to EntityContext The EJB 2 entity bean provided environment information with the javax.ejb. EntityContext object. EJB 3 entities are no longer components and therefore do not have contexts of their own. This means there is no EntityContext equivalent in EJB 3. You have to migrate the use of EntityContext to one of the appropriate alternatives. One of the most commonly used methods in the EntityContext is the getPrimaryKey method. You can create a business method to expose the primary key of the entity to the caller. As outlined in table 14.3, the setEntityContext and unSetEntityContext methods are now candidates for removal because they are no longer supported. Business methods It s quite possible that you may have business methods in your entity classes that are using JNDI to find other entity beans. Perhaps you are using the ejbSelect method of another entity bean (e.g., ItemBean) in a business method of UserBean. You could migrate this code to the entity class by using a named query of the entity class. This would require grabbing an instance of the EntityManager using JNDI. However, we recommend against the approach of using JNDI code within
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