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Some application servers and some JMS vendors allow you to specify the redelivery count of a rolled-back message delivery to a message-driven bean. However, to ensure your message-driven EJBs are the most secure and portable, you can implement a simple message tracker like the one shown in the recipe. In this code, the EJB maintains a Map of message IDs and the number of times they have been delivered. If the delivered count for a particular message reaches a predefined constant value, the bean simply logs the message and returns. By returning successfully, the EJB ensures that the EJB container commits the transaction and the message will not be delivered again. If the message makes it past the count check, the bean will attempt to perform its business function. After attempting the business logic, the EJB will check to see if it is necessary to mark the current transaction for rollback. If so, the EJB uses its MessageDrivenContext instance to mark the transaction and returns. The container will roll back the transaction and will attempt to redeliver the message. The previousMessages Hashtable will store only those message IDs that caused errors. If the message succeeds, no ID is stored (and any previously stored ID is removed).

boundaries. In fact, once attached, entities pretty much stay managed as long as the EntityManager instance is around. As an example, for a stateful session bean, an EntityManager with extended scope will keep managing all attached entities until the EntityManager is closed as the bean itself is destroyed. As figure 9.4 shows, this means that unless explicitly detached through a remove method to end the life of the stateful bean instance, entities attached to an extended persistence context will remain managed across multiple transactions.

Figure 9.4 For an extended persistence context, once an entity is attached in any given transaction, it is managed for all transactions in the lifetime of the persistence context.

Before advice code is executed before the joinpoints that are included in the pointcut associated with the advice code The following example illustrates the usage of before advice code: before(): toBeTraced() { Systemoutprintln(".. before the joinpoints included in toBeTraced .."); } The syntax for the definition of before advice code consists of the type of advice code (here, before), the name of the pointcut descriptor that is associated with the advice code (here, toBeTraced), and the code itself between curly brackets The second part, the name of the pointcut descriptor, is not mandatory You can provide the code of the pointcut descriptor right after the type In this case, the pointcut is said to be anonymous An example of anonymous pointcut is the following: before(): call( * OrderaddItem(.) ) { ...

The term scope is used for persistence contexts in the same manner that it is used for Java variable scoping. It describes how long a particular persistence context remains active. Transaction-scoped persistence contexts can be compared to method local variables, in the sense that they are only in effect within the boundaries of a transaction. On the other hand, persistence contexts with extended scope are more like instance variables that are active for the lifetime of an object they hang around as long as the EntityManager is around. At this point, we ve covered the basic concepts needed to understand the functionality of the EntityManager. We are now ready to see the EntityManager itself in action.

Part of the secret of success in life is to eat what you like and let the food fight it out inside. Mark Twain

9.1.4 Using the EntityManager in ActionBazaar We ll explore the EJB 3 EntityManager interface by implementing an ActionBazaar component. We ll implement the ItemManagerBean stateless session bean used to provide the operations to manipulate items. As listing 9.1 demonstrates, the session bean provides methods for adding, updating, and removing Item entities using the JPA EntityManager.

package ejb3inaction.actionbazaar.model; import java.sql.Date; public class Category { protected Long id;