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When a transaction in a message-driven bean rolls back, the application server can be configured to resend the JMS message that started the transaction. If the error that caused the rollback keeps occurring, you could potentially cause an endless loop. Background Rollbacks in message-driven beans occur in the same way that they can happen in other beans an error occurs in executing logic. However, in the case of a message-driven bean using a durable subscription, the application server will most likely attempt to redeliver the message that caused the rollback in the bean. If the error is not corrected, the rollback will continue on, consuming more processing time and memory. You need your message-driven beans to be insulated from rollback loops and able to handle error-causing messages without a rollback every time.

This means that you can write your server components as if you were developing a single-threaded desktop application It doesn t matter how complex the component itself is; EJB will make sure it is thread-safe The EJB container manages state transparently for stateful components instead of having you write verbose and error-prone code for state management This means that you can maintain state in instance variables as if you were developing a desktop application EJB takes care of all the details of session maintenance behind the scenes EJB 3 allows you to write messaging-aware components without having to deal with a lot of the mechanical details of the Java Messaging Service (JMS) API EJB supports declarative transaction management that helps you add transactional behavior to components using simple configuration instead of code In effect, you can designate any component method to be transactional.

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If the method completes normally, EJB commits the transaction and makes the data changes made by the method permanent Otherwise the transaction is rolled back EJB supports integration with the Java Authentication and Authorization Service (JAAS) API, so it is very easy to completely externalize security and secure an application using simple configuration instead of cluttering up your application with security code EJB 3 introduces AOP in a very lightweight, accessible manner using interceptors This allows you to easily separate out crosscutting concerns such as logging, auditing, and so on in a configurable way In EJB 3, you can make components remotely accessible without writing any code In addition, EJB 3 enables client code to access remote components as if they were local components using DI continued on next page.

To handle rollbacks in a message-driven bean, keep track of the number of times a particular message has been delivered to the bean. Once a certain retry limit is reached, you want to discard the message from that point on. Listing 6.23 shows the onMessage() method from a message-driven bean that tracks and checks message redelivery attempts.

Many-to-many If both sides of the relationship can have more than one object, the relationship is many-to-many. For example, an Item can be in more than one Category and a Category can have multiple Items.

Ordinality, or optionality Ordinality, or optionality, of a relationship determines whether an associated entity exists. For example, we have a bidirectional one-to-one association between User and BillingInfo, and every user need not always have billing information, so the relationship is optional. However, BillingInfo always belongs to a User and hence the optionality for the BillingInfo-User association is false. Having established the basic concepts of domain modeling, we can now start discussing how the domain model is persisted using the EJB 3 Java Persistence API and actually begin implementing our domain model.

private HashMap previousMessages; private int count = 0; public void onMessage( Message incomingMsg ) { // get the unique message Id String msgId = incomingMsg.getJMSMessageID();

In contrast to EJB 2 entity beans, the EJB 3 Java Persistence API (JPA) is a metadata-driven POJO technology. That is, to save data held in Java objects into a database, our objects are not required to implement an interface, extend a class, or fit into a framework pattern. In fact, persisted objects need not contain a single inline statement of JPA. All we have to do is code our domain model as plain Java objects and use annotations or the XML to give the persistence provider the following information:

withincode(methexpr) true when the joinpoint is defined in a method with a signature that matches methexpr within(typeexpr) this(typeexpr) target(typeexpr) cflow(pcd) cflowbelow(pcd) true when the joinpoint is defined in a class with a name that matches typeexpr true when the source-object type for the joinpoint matches typeexpr true when the target-object type for the joinpoint matches typeexpr true for any joinpoint located from the entry of the given pointcut descriptor (pcd) to the exit, inclusive true for any joinpoint located from the entry of the given pointcut descriptor (pcd) to the exit, exclusive