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True if the column value is unique. Designates whether the column is a nullable or mandatory column. Useful for automatic table generation. Set to true if the column is included in the INSERT statement generated by the provider. Useful when the column is populated by triggers, default values, etc. Set to true if the column is included in the UPDATE statement generated by the provider. Typically useful for primary keys. Definition of column. Useful for automatic table generation. Name of the table to which the column belongs. Typically useful for an entity that is mapped to multiple tables. Length of column for char/varchar2 types. Precision of numeric type columns. Scale of numeric type columns.

The ejbTimeout() method of the TimedObject interface is a callback method that is invoked when a timer event occurs A timer event is either a single expiration of the timer (as in the case of EJBTimer1 in the session bean) or a repeated event at an interval (as in the case of EJBTimer2) When the ejbTimeout() callback is invoked, the method receives the Timer instance that corresponds to the timeout The session bean in the recipe uses the instance to print some information from the timer Timer instances are created by specifying their interval times, and by passing in some user info that can be retrieved when the timer expires using the getInfo() method (it is optional and can be null) Timers are cancelled in a few specific situations In the case of the single event timer, it expires after invoking the ejbTimeout() method.

In this chapter, we have presented the use of AOP to improve the design of the business tier. From a separation of concerns perspective, we can conclude that the AOP is successfully applied to our case study since many crosscutting concerns have been more clearly separated, including the following: Dependencies towards the EJB/J2EE technology Management and resolving of business object references Persistence Preconditions (including technical and business preconditions) Transactions It is still possible to modularize other concerns, such as logging, that we have not shown here. Figure 11-3 shows the components that form the business tier when all the aspects are applied. Each gray bar corresponds to a regular EJB. Indeed, the gray color indicates that no aspects have been applied. The first bar corresponds to the Entity EJB AccountBean, the second corresponds to the AccountPOJO, and so on for each component.

As we stated earlier, in addition to the @EJB annotation the @Resource annotation provides DI functionality in EJB 3. While the @EJB annotation is limited to injecting EJBs, the @Resource annotation is much more general purpose and can be used to inject anything that the container knows about.

As shown in listing 2.5, the container looks up the JMS resources specified through the name parameter and injects them into the connectionFactory and billingQueue instance variables. The name parameter values specify what resources are bound to the EJB s environment naming context. Then the PlaceOrderBean establishes a connection to the JMS provider, and creates a session and a message producer C. Secondly, it is important to realize that the MessageProducer.send method D doesn t wait for a receiver to receive the message on the other end. Because the messaging server guarantees that the message will be delivered to anyone interested in the message, this is just fine. In fact, this is exactly what enables the billing process to start in parallel to the ordering process, which continues on its merry way as soon as the message is sent. You should also note how loosely coupled the ordering and billing processes are. The ordering bean doesn t even know who picks up and processes its message; it simply knows the message destination! Finally, PlaceOrderBean cleans up all resources used by it E. As we know from our solution schematic in section 2.2, the OrderBillingMDB processes the request to bill the order. It continuously listens for messages sent to the jms/OrderBillingQueue messaging destination, picks up the messages from the queue, inspects the Order object embedded in the message, and attempts to bill the user. We ll depict this scheme in figure 2.6 to reinforce the concept.