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Now that we ve covered some of the most fundamental concepts of EJB 3, it is time to warm up to code. The problem we solve in this chapter utilizes an essential element of this book ActionBazaar. ActionBazaar is an imaginary enterprise system around which we ll weave most of the material in this book. In a sense, this book is a case study of developing the ActionBazaar application using EJB 3. Let s take a quick stroll around the bazaar to see what it is all about.

A flexible MVC web application framework, built on core Spring functionality. This framework is configurable via strategy interfaces, and accommodates multiple view technologies like JSP, Velocity, Tiles, iText, and POI.

object, or when dependencies of a previously loaded class cannot be resolved. Typically, you run into this issue when all dependent libraries are not at the same class loader level.

To return HTML instead of pure XML, indicate to the test redirector servlet that it should use an XSL style sheet. Here is the modified URL:

ClassCastException normally is the result of duplication of classes at dif-

ferent levels. This occurs in the same-class, different-loader situation; that is, you try to cast a class loaded by class loader (L1) with another class instance loaded by class loader (L2).

We have presented the basics of Spring and the IoC principle; in this section, we introduce Spring AOP with a simple example. For our example, we reuse the same Order Management example as in the previous chapters (see s 3, 4, and 5) and implement the same trace aspect that was programmed in these chapters, but now with Spring AOP. This aspect traced the execution of the application.

In order for this to work successfully, you need to make sure you deploy the XSL style sheet where the servlet can find it. Consult the Cactus documentation if you have any problems. In figure 9.2, we ve captured the test case output in the browser. Executing unit tests from UI classes Each of the test cases we wrote in previous recipes contained a main() method that lets you execute it from a command line using the Java runtime environment. These main() methods make use of a utility class provided by the JUnit framework for executing test cases visually. The following is a sample main() method from one of our test cases:

NamingException is typically thrown when a JNDI lookup fails, because the container tries to inject a resource for an EJB that does not exist. The stack trace for this exception gives the details about which lookup is failing. Make sure that your dependencies on DataSources, EJBs, and other resources resolve properly.

Your deployment may fail due to an invalid XML deployment descriptor. Make sure that your descriptors comply with the schema. You can do this by using an IDE to build your applications instead of manually editing XML descriptor files.

11.6 Summary

public static void main(String[] theArgs) { junit.swingui.TestRunner.main(new String[] {TestServlet.class.getName()}); }

Our first aspect written with Spring AOP monitors each ordered item by displaying a message before and after the method addItem as defined in the class Order. Defining this aspect requires us to define a Java class TraceInterceptor (similar to around advice), and also to define a corresponding bean in the XML bean definition file (usually applicationContext.xml). Still in a bean definition file, a pointcut must be defined and linked to the interceptor by using an advisor. In the Spring Framework, AOP is naturally integrated because it follows the IoC principle and is consistently defined with the bean model. Interceptor, pointcut, and advisor dependencies are implemented exactly like regular bean dependencies. In order to enable AOP, the program must use an ApplicationContext factory (or a derivative). It is important to notice that the ApplicationContext factory will return an AOP proxy when accessing a bean. Spring uses J2SE proxies to generate the proxies when possible (when an interface is defined for the bean), and CGLIB proxies otherwise. When a method is called on a bean, it is the AOP proxy that automatically up-calls the potentially installed interceptors for this method.