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well suited to the problem of persistence); instead, it follows an API paradigm similar to JDBC, JavaMail, or JMS. As you ll soon see, the JPA EntityManager interface defines the API for persistence while JPA entities specify how application data is mapped to a relational database. Although JPA takes a serious bite out of the complexity in saving enterprise data, ORM-based persistence is still a nontrivial topic. We ll devote the entire third part of this book to JPA, namely chapters 7 through 10. In almost every step of our ActionBazaar scenario, data is saved into the database using JPA. We won t bore you by going over all of the persistence code for the scenario. Instead, we ll introduce JPA using a representative example and leave you to explore the complete code on your own. You ll see what EJB 3 persistence looks like by revisiting the PlaceBid stateless session bean. As a reminder to how the bidding process is implemented, figure 2.7 depicts the various components that interact with Figure 2.7 PlaceBidServlet invokes the one another when a bidder creates a bid in addBid method of PlaceBid EJB and passes ActionBazaar. a Bid object. The PlaceBidEJB invokes the Recall that the PlaceBidServlet calls persist method of EntityManager to save the Bid entity into the database. When the the PlaceBidBean s addBid method to add a transaction commits, you ll see that a Bid entity into the database. The Placecorresponding database record in the BIDS BidBean uses the JPA EntityManager s pertable will be stored. sist method to save the bid. Let s first take a look at the JPA, and then we ll see the EntityManager in action.

4.1 Retrieving an environment variable 4.5 Sending an email from an EJB 4.6 Using the EJB 2.1 timer service

You might have noticed in listing 2.1 that we kept the code to save a bid into the database conveniently out of sight. The PlaceBid EJB s addBid method references the hidden save method to persist the Bid object to the database. Listing 2.8 will fill in this gap by showing you what the save method actually does. The save

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method uses the JPA EntityManager to save the Bid object. But first let s take a quick look at the fourth and final kind of EJB the JPA entity. Listing 2.7 shows how the Bid entity looks.

You want to insulate your EJBs from the implementation of classes that encapsulate the services of your application.

package ejb3inaction.example.persistence; import import import import import import import import java.io.Serializable; java.sql.Date; javax.persistence.Column; javax.persistence.Entity; javax.persistence.Id; javax.persistence.Table; javax.persistence.GenerationType; javax.persistence.GeneratedValue;

@Entity Marks POJO as entity @Table(name="BIDS") Specifies table mapping public class Bid implements Serializable { private Long bidID; private Long itemID; private Long bidderID; private Double bidAmount; private Date bidDate;

protected pointcut connectionservice(String aDataSource) : call(* aop.j2ee.client.java.aspectized..*.getDatabaseConnection(String)) && args(aDataSource); protected pointcut jmsservice(String aJMSObject) : call( * aop.j2ee.client.java.aspectized..*.getJMSObject(String))&&args(aJMSObject); protected Object createService(Class aClass, Object home) throws Exception { if (aClass.getName().equals(BANK_SERVICE)) { BankHome bankhome = (BankHome) home; return bankhome.create(); } throw new Exception("Cannot create service for " + aClass); } public pointcut exception() : call(* aop.j2ee..*+.*(..) throws *Exception) && within(aop.j2ee.client.java.aspectized.* +); private EJBServiceLocator ejbLocator; private JDBCServiceLocator jdbcConnectionLocator; private JMSServiceLocator jmsObjectLocator; Object around(Class aClass) throws SystemException : ejbservice(aClass) { Object service = null; try { if (ejbLocator == null) ejbLocator = new EJBServiceLocator(); Object home = ejbLocator.lookup(aClass); service = createService(aClass,home); } catch (NamingException ne) { throw new SystemException(ne.getMessage()); } catch (ClassNotFoundException cne) { throw new SystemException(cne.getMessage()); } catch (CreateException ce) { throw new SystemException(ce.getMessage()); } catch (RemoteException re) { throw new SystemException(re.getMessage()); } catch (Exception e) { throw new SystemException(e.getMessage()); } return service; }

Many times EJBs make use of other objects to encapsulate business functions as services to the bean. Encapsulating business logic allows many EJBs to reuse the business logic. However, as your application grows, you may find that your service classes have subclasses that provide specialized implementations of the business logic. As your EJBs start to use the specialized subclasses of the service classes, they become less portable and more dependent on outside classes.

@Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="BID_ID") public Long getBidID() { return bidID; } public void setBidID(Long bidID) { this.bidID = bidID; } @Column(name="ITEM_ID") public Long getItemID() { return itemID; } public void setItemID(Long itemID) { this.itemID = itemID; } @Column(name="BIDDER_ID") public Long getBidderID() { return bidderID; }