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In a CMT, the container starts, commits, and rolls back a transaction on our behalf. Transaction boundaries in declarative transactions are always marked by the start and end of EJB business methods. More precisely, the container starts a JTA transaction before a method is invoked, invokes the method, and depending on what happened during the method call, either commits or rolls back the managed transaction. All we have to do is tell the container how to manage the transaction by using either annotations or deployment descriptors and ask it to roll back the transaction when needed. By default, the container assumes that you will be using CMT on all business methods. This section describes CMT in action. We ll build the Snag-It ordering system using CMT and you ll learn how to use the @TransactionManagement and @TransactionAttribute annotations. Also, you ll learn both how to roll back a transaction using methods of EJBContext and when an application exception is raised.

The thisJoinPoint keyword implements the introspection mechanism in AspectJ. In regular Java, this is the reference to the current object. Similarly, in AspectJ, thisJoinPoint is a reference to an object describing the current joinpoint, which implements the predefined org.aspectj.lang.JoinPoint interface. Table 3-1 sums up the main methods defined in this interface. Two of them, getSignature and getSourceLocation, use predefined interfaces, which are Signature and SourceLocation, respectively. The AspectJ Javadoc documentation gives more details on the methods provided by these interfaces. Table 3-1. Main Methods Defined in org.aspectj.lang.JoinPoint

topicConnection = null; topicSession = null; topicPublisher = null; topic = null; topicFactory = null;

Listing 6.1 implements the Snag-It ordering scenario as the method of a stateless session bean using CMT. This is fine since the user can order only one item at a time using the Snag-It feature and no state information has to be saved between calls to the OrderManagerBean. The bean first checks to see if there are any bids on the item, and if there are none, it validates the customer s credit card, charges the customer, and removes the item from bidding. To keep the code sample as simple

@Stateless @TransactionManagement(TransactionManagementType.CONTAINER) public class OrderManagerBean { Uses CMT Injects EJB context @Resource private SessionContext context; ... @TransactionAttribute(TransactionAttributeType.REQUIRED) public void placeSnagItOrder(Item item, Customer customer){ try { Defines Transaction if (!bidsExisting(item)){ attribute for method validateCredit(customer); chargeCustomer(customer, item); removeItemFromBidding(item); } } catch (CreditValidationException cve) { context.setRollbackOnly(); } catch (CreditProcessingException cpe){ Rolls back on context.setRollbackOnly(); exception } catch (DatabaseException de) { context.setRollbackOnly(); } } }

First we tell the container that it should manage the transactions for this bean b. If we do not specify the @TransactionManagement annotation or the transactiontype element in the deployment descriptor, the container assumes that we intend to use a CMT. The EJB context is injected into the bean C. A transaction is required for the placeSnagItOrder method D and one should be started by the container when needed. If an exception stops us from completing the Snag-It order, we ask the container to roll back the transaction using the injected EJBContext object s setRollbackOnly method E. Let s take a closer look at the TransactionManagement annotation b.

url= "http://myjndihost";

Object[] getArgs() Signature getSignature()

The @TransactionManagement annotation specifies whether CMT or BMT is to be used for a particular bean. In our case, we specify the value TransactionManagementType.CONTAINER meaning the container should manage transactions on the

bean s behalf. If we wanted to manage transactions programmatically instead, we d specify TransactionManagementType.BEAN for the TransactionManagement value. Notably, although we have explicitly included the annotation in our example, if we leave it out the container will assume CMT anyway. When we explore BMT, it will be more obvious why a CMT is the default and most commonly used choice. Next, we ll look at the second transaction-related annotation in listing 6.1: @TransactionAttribute.

public Client( String factoryJNDI, String topicJNDI ) throws JMSException, NamingException { // Get the initial context, implementation not shown Context context = getInitialContext(); // Get the connection factory topicFactory = ( TopicConnectionFactory ) context.lookup( factoryJNDI ); // Create the connection topicConnection = topicFactory.createTopicConnection(); // Create the session topicSession=topicConnection.createTopicSession( false, Session.AUTO_ACKNOWLEDGE ); // Look up the destination topic = ( Topic ) context.lookup( topicJNDI ); // Create a publisher topicPublisher = topicSession.createPublisher( topic ); } public void sendToMDB( String filename ) throws JMSException { byte[] bytes = new byte[1024]; FileInputStream istream = null; Creates the int bytesRead = 0;