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//second statement public String getValue() { String returnValue = computeValue(); if( logger.isDebugEnabled() ) //check for level enabled { logger.debug("Final value of action " + action + " is " + returnValue ); //reuse computed value } return returnValue; }

We also provided a taste of code to show how EJB 3 addresses development pain points that were inherent with EJB 2, and we took a brief look at how EJB 3 can be used with Spring. Armed with this essential background, you are probably eager to look at more code. We aim to satisfy this desire, at least in part, in the next chapter. Get ready for a whirlwind tour of the entire EJB 3 API that shows just how easy the code really is.

The term introspection refers to examining the inner cause of a given phenomenon and gaining information about it. In the context of AOP, the phenomenon is the joinpoint, and you want to retrieve information about the part of the actual program that allows the joinpoint to occur. With JAC, the introspection mechanism is made available by the MethodInvocation and ConstructorInvocation parameters that are passed when the invoke and construct methods are called. These types are defined in the AOP Alliance API, which is included in JAC. Figure 4-1 illustrates the interface hierarchy that defines MethodInvocation and ConstructorInvocation.

Metadata annotations Dependency injection The ActionBazaar application Code examples of session beans, MDBs, and entities

The first logging statement incurs the cost of an extra method call to computeValue() and string concatenation for the message even if the DEBUG level of the logging system is disabled. The second statement wisely reuses the returnValue object, and also constructs the log message only if the DEBUG level is enabled. Change your conversion patterns The PatternLayout class and ConversionPattern attribute comprise one of the most common configurations for log4j. However, many of the PatternLayout s formatting options can slow down your application. Table 8.3 lists the conversion characters you should use with caution and really only if performance is not an issue with your application. Change the layout class of an appender Change the layout class to the org.apache.log4j.SimpleLayout class. This layout class produces messages that include only the log level and message of the logging event:

In this age of hyper-competitiveness, learning a new technology by balancing a book on your lap while hacking away at a business problem on the keyboard has become the norm Let s face it somewhere deep down you probably prefer this baptism by fire to trudging the same old roads over and over again This chapter is for the brave pioneer in all of us, eager to peek over the horizon into the new world of EJB 3 The first chapter gave you a 20,000-foot view of the EJB 3 landscape from on board a hypersonic jet We defined EJB, described the services it offers as well as the EJB 3 architectural vision, and listed the different parts of EJB 3 This chapter is a low-altitude fly-over with a reconnaissance airplane Here, we ll take a quick look at the code for solving a realistic problem using EJB 3.

The example solution will use all of the EJB 3 components types, a layered architecture, and some of the services we discussed in chapter 1 EJB 3 offers a wide range of features and services To keep things sane, the examples in this chapter are designed to show you the high-level features and services of EJB 3, and to introduce you to the major players: the beans and clients Thanks to the almost invisible way most EJB 3 services are delivered, this is pretty easy to do You ll see exactly how easy and useful EJB 3 is and how quickly you could pick it up We start by covering some basic concepts necessary for understanding the examples, and then we introduce the application that runs throughout the book: ActionBazaar In the rest of the chapter, we illustrate each EJB type with an example from the ActionBazaar application.