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With EJB 3, entities can be used inside either the EJB or web container, or in a Java SE application. Thus, entities may be packaged in a standard Java EE module such as an EJB -JAR, WAR, or JAR file in the root of the EAR module or as a library module in an EAR. When using entities in your applications, you have to package entity classes into a Java EE module such as an EJB -JAR or WAR of simple JAR files, with a simple deployment descriptor named persistence.xml. If you are using entities within an EJB module, then the EJB (session beans, MDBs) classes and entities need to be packaged together in the same EJB module. Therefore, the EJB -JAR module will contain a persistence.xml file to designate that the module contains one or more persistence units. Recall from our discussion in chapter 9 that a persistence unit is a logical group of entities used together. For example, you may create a persistence unit for all entities in the ActionBazaar application. Let s look at the structure of a JAR that contains a simple persistence unit, as shown in listing 11.5.

public static Test suite(){ return new TestSuite(TestEntity.class); } public void testCreateEntity(){

pointcut and can be reused more easily. With annotations, pointcuts and aspects are defined in the same location. The advantage of this situation is that it allows the beginner AOP programmer to be more intuitive. Annotations are defined next to the aspect classes, so they are easier to understand. The other advantage of annotations is that they are natively supported by modern IDEs, such as the recent versions of Eclipse, which include Java 5. Like JAC, JBoss AOP is a framework that supports dynamic AOP. In other words, aspects can be woven and unwoven at run time without stopping the application. Finally, the recent versions of JBoss AOP are distributed with a library of ready-to-use aspects for transaction management (specifically, demarcation, injection, and locking), security, remote interactions, clustering, and cache management.

ActionBazaar-ejb.jar: META-INF/ persistence.xml orm.xml (optional) actionbazaar/ persistence/ Category.class Item.class ...

persistence.xml is the deployment descriptor for a persistence module, which is discussed in the next section. The orm.xml b file defines the object-relational mapping (if you use XML mapping). You may package an additional mapping file C that defines O/R mapping for entities that was not defined in orm.xml. We discuss O/R mapping with XML in section 11.5.2. The JAR also contains entity classes Category.class and Item.class and another class, BazaarAdmin.class,

try{ TestEntityHome home = lookupHome(); TestEntity entity = createEntity("This is a test",home); } catch(Exception e){ e.printStackTrace(); System.out.println("Failed Finding Entity:"+e.getMessage()); } } public void testFindEntity(){ Integer id = null; try{ TestEntityHome home = lookupHome(); //---------[ Create the entity ]--------------// TestEntity entity = createEntity("This is a test",home); id = entity.getEntityId(); System.out.println("Created Entity with ID:" +id.intValue()); //---------[ Find the entity ]--------------// entity = findEntity(id, home); //---------[ Check the id to be identical ]-----------// assertEquals(id, entity.getEntityId());

that is needed in order to make persistence work. Now that you know the structure of a persistence module, let s drill down and learn more about persistence.xml.

his chapter presents a fourth environment for aspect-oriented programming: Spring AOP. Spring AOP is part of the Spring Framework Open Source project (http:// www.springframework.org), which aims to simplify the development of J2EE applications. Spring was initially created by Rod Johnson, and has been Open Source since February 2003. The architectural concepts, however, go back to early 2000, and emerged from its creator s experience on J2EE commercial developments, which have been published in Rod Johnson s book, Expert One-on-One J2EE Design and Development (Wrox Press, 2002). Spring is now a successful Open Source project with a very active community, and is licensed under the terms of the Apache 2.0 license. Although AOP is not the primary goal of the Spring Framework, the support that AOP provides, though limited, is general enough to be depicted in this book. Similar to JAC, Spring AOP supports the AOP Alliance API, which is a common effort of standardization for generic interception in Java, as used by many AOP platforms. In addition, Spring AOP has been designed to be easily used in many J2EE environments and application servers (such as WebLogic, Tomcat, JBoss, Resin, and Jetty). In this chapter, we briefly present the architecture of the Spring Framework in general. We then focus on Spring AOP and the provided AOP features. Note that we use Spring version 1.2 only as a reference since it is the most recent and stable version available at the time of this writing.