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@PreDestroy public void cleanup() {

try { connection.close(); } catch (SQLException sqle) { sqle.printStackTrace(); } }

For the client side, we define an aspect that allows the transparent use of this service when the aggregated invocation sequence is used, as shown in Listing 12-11.

private Long getBidId() { ... } public void cancelBid(Bid bid) {...} public List<Bid> getBids(Item item) {...} ... } Designates remote ... business interface @Remote public interface BidManager { void addBid(Bid bid); void cancelBid(Bid bid); List<Bid> getBids(Item item); }

In the assembly descriptor section of the ejb-jar.xml file, you should set the transaction attribute for each EJB method. The <container-transaction/> element s

As you ve seen before, the @Stateless annotation marks the POJO as a stateless session bean b. The BidManagerBean class implements the BidManager interface, which is marked @Remote F. We use the @Resource annotation to perform injection of a JDBC data source C. The BidManagerBean has a no-argument constructor that the container will use to create instances of BidManagerBid EJB object. The PostConstruct D and PreDestroy E callbacks are used to manage a JDBC database connection derived from the injected data source. Finally, the addBid business method adds a bid into the database. We ll start exploring the features of EJB 3 stateless session beans by analyzing this code next, starting with the @Stateless annotation.

The @Stateless annotation marks the BidManagerBean POJO as a stateless session bean. Believe it or not, other than marking a POJO for the purposes of making the container aware of its purpose, the annotation does not do much else. The specification of the @Stateless annotation is as follows:

<ejb-name> value lists the name of the EJB that contains the named method in the <method-name> value. In addition, the <method-name> value can be an *, indicating that the transaction attribute applies to all the methods of an EJB. Each <containertransaction/> element can list several methods and must contain the <transattribute/> tag. This tag declares the transaction level for the specified method.

Listing 12-11. A Transfer Object Aspect (Client Side) 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 package aop.j2ee.client.java.aspect; import import import import import java.math.BigDecimal; java.util.Date; aop.j2ee.commons.aspect.to.*; aop.j2ee.business.session.bank.Bank; aop.j2ee.client.java.aspectized.Simple;

@Target(TYPE) @Retention(RUNTIME) public @interface Stateless { String name() default "";

String mappedName() default ""; String description() default ""; }

Table 5.1 The <trans-attribute> tag value can be one of the following values. Each value sets a transaction level for an EJB. Transaction Control Level NotSupported Description No transaction can be propagated to a method with this attribute. The current transaction will be suspended until the method completes, and then will resume. This attribute is commonly used for a method that should never be used in a transaction. Indicates that a method does not require a transaction but can be executed within the scope of a transaction. Methods with this attribute support operation with or without transactions. A transaction must be used when invoking a method with this attribute. If one cannot be propagated to it, the container will create a new transaction. This attribute should be used for methods that must always run inside a transaction. Required transaction methods are those that are usually critical business functions that must complete successfully to ensure data integrity or to complete a user process (and should be reversible upon failure). When a method with this transaction attribute is invoked, the EJB container will create a new transaction for it. Methods declared with this attribute should never run inside transactions that have already completed work. The invoked method must always be part of a transaction. If a nontransactional method invokes it, the invocation will fail with a TransactionRequiredException (for remote clients) or RequiredLocalException (for local clients) exception being thrown. The method with this attribute must never be invoked inside a transaction; otherwise, it will fail with a RemoteException (for remote clients) or EJBException (for local clients) exception being thrown.