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Migrating to EJB 3
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Assume that ActionBazaar used the DTO design pattern. Listing 14.3 shows a sample of a fine-grained DTO named UserDTO that maps to a UserBean entity bean.
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Listing 14.3 A DTO for the UserBean CMP
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public class UserDTO implements Serializable { private String userId; private Date birthDate; Field definition private String userStatus; private Double commRate; private Long creditRating; private String firstName; private String lastName; private Long maxItems; private Long userBillingId; private String userType;
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private Collection bids; public UserDTO() { }
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Reference to another DTO
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Constructor
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public String getUserId() { return userId; } public void setUserId(String userId) { this.userId = userId; } public String getUserType() { return userType; } public void setUserType(String userType) { this.userType = userType; } }
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Get/Set methods
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Reviewing UserDTO in listing 14.3, it looks more like an entity. It s a POJO; it has a constructor d, fields b, and properties E required for the persistent attributes defined. It even has a relationship defined to another DTO c that you can use as a basis for relationships between entities. It s worth considering making this class an entity rather than migrating the abstract entity bean class in listing 14.1 to an entity. You can make the DTO an entity by simply annotating it as an entity with the @Entity annotation, and defining the O/R mapping from your vendor-specific
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Migrating CMP 2 entity beans to the EJB 3 JPA
deployment descriptor to either metadata annotations or orm.xml. Following is the UserDTO (renamed to User) converted to an entity with a few JPA annotations:
@Entity @Table(name = "USERS") public class User implements Serializable { @Id @Column(name = "USER_ID") private String userId; private Date birthDate; ... }
You have to make sure that you have defined all persistence fields in the entity class by cross-checking the persistence fields defined in the deployment descriptor with your entity bean. You ll also need to migrate the ORM metadata from the vendor-specific deployment descriptor, to either mapping annotations in the entity class or to a mapping file. After you migrate the finder methods and select methods to named queries, you re almost done! The last step is to recall that your entity beans may have some business logic in the business methods. You have to migrate any business methods from the entity bean to the entity class, or to a session bean fa ade, as we describe next.
14.4.3 Entity bean classes and interfaces
If your applications have not used DTOs, then we re afraid you re in for a lot of monotonous work as you migrate your entity beans to entities. We hope it s evident from listing 14.1 that since the entity bean class and all methods are abstract, you ll have to convert the bean class to a concrete class with a constructor and define persistence fields as well as the obligatory getter/setter methods. The first step in migration will be similar to creating a DTO for your entity bean and annotating it with @Entity. Persistence fields are actually defined in the EJB deployment descriptor. Migrating all the fields to your bean class and creating the appropriate fields and getter/setter methods in the entity class is required since we re relying on dependency injection to help us out at runtime. You should be able to find some development tools and utilities to help automate these mechanical steps. Converting interfaces EJB 2 entity beans required two interfaces: a component (remote or local) interface and a home interface. EJB 3 entities don t require any framework interfaces,
Migrating to EJB 3
so you can entirely eliminate the interfaces from your entities if you like, or convert your component interface to a business interface for the entity. Optionally, you can use your component interface as the basis for migrating to an entity. Listing 14.4 shows the local interface for the UserBean entity bean. A quick glance informs us that it will be easy to migrate this interface to an EJB 3 entity. The interface has all get/set methods for the persistence fields b and the relationships c.
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