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Both aspects apply on the instances of the Stats class (see the pointcut receiver on lines 4 and 16). Both are also triggered when the Stat.incOrders method is called (see the pointcut execute on lines 5 and 17).

Use the named query in the getBids method of the BidDAOImpl class:

A primary key class must meet four requirements:

public List getBids(Long itemId) { Item item = (Item)em.find(Item.class, itemId); Query query = em.createNamedQuery("findBidsByItem"); Query.setParameter(1, item); return query.getResultList(); }

If you look at the migrated methods (insertBid in section 14.5.2 and getBids) and compare them with the original methods in BidDAOImpl, they should look much simpler. You can follow our guidelines to migrate all your JDBC DAO code to use the EJB 3 Persistence API with very little impact on the business tier of your applications. Don t you just love it Next we tackle migrating applications that currently use O/R frameworks over to our new friend, the EJB 3 JPA.

The important point in this example is the use of the declare precedence clause at line 14, which allows the definition of the aspect order in the chain. Here, the aspect Step2ChainAspect will be executed after Step1ChainAspect. The ChainExample class in Listing 8-19 illustrates the usage of our implementation of the Chain of Responsibility design pattern. Listing 8-19. Main Class for Testing the Chain of Responsibility Design Pattern package aop.patterns.chainOfResponsibility; public class ChainExample { public static void main(String[] args) { Stats stats = new Stats(); stats.incOrders(); stats.addAmount(10); stats.incOrders(); stats.addAmount(10); stats.incOrders(); stats.addAmount(10); } } When run, this program displays the following output: OrderHandler OrderHandler OrderHandler OrderHandler OrderHandler OrderHandler n 1 n 2 n 1 n 2 n 1 n 2

EJB 3 persistence is the result of a lot of hard work between individuals; vendors of major O/R mapping solutions such as Hibernate, TopLink, and JDO, and countless others. If you ve ever used any of these frameworks, you know that the EJB 3 JPA looks an awful lot like your favorite O/R framework, which will make it easier for you to migrate to EJB 3 from an existing O/R solution. Covering detailed migration steps from each of these persistence solutions is out of the scope of this book. However, we will provide some generic steps for migrating applications that utilize O/R frameworks to convert to the EJB 3 JPA. The EJB 3 JPA is now the standard API to build the persistence tier for applications. Each of the persistence providers will provide some mechanisms

It must implement the java.io.Serializable interface. It should declare public method variables that are a subset of the persistent fields of the entity bean. The names of these primary key fields and entity fields should be exactly the same. It should define a default constructor. It should define the hashCode() and equals() methods.

to facilitate migration to EJB 3. Check your vendor documentation for tools or utilities to ease the migration process. If you are using an O/R framework, it is assumed that you ll migrate an existing domain model to the EJB 3 JPA. Migration of applications using proprietary O/R solutions will involve three or four major steps:

Migrate proprietary mapping metadata to use the EJB 3 JPA O/R mapping annotations or orm.xml. Check your vendor s documentation to see if they provide any tools to assist in this effort. Migrate vendor-specific APIs (e.g., Hibernate s Session API to perform CRUD operations) to use the EntityManager API. Table 14.6 shows what the migrated code will look like when you migrate from two popular frameworks.

The EJB container uses these requirements, along with reflection, to create and populate an instance of the primary key class as needed. The equals() and hashCode() methods of the primary key class allow instances of the class to be properly used in collections. The PortfolioHolding CMP entity bean returns null from its ejbCreate() method because the EJB container is going to instantiate and populate an instance of the HoldingKey class and return it to the EJB client as the primary key. A default constructor must exist in the primary key class for this to work successfully. Inside the ejbCreate() method, the bean must set the values passed in using the abstract methods in order for the EJB container to properly construct a primary key instance. The container will use the abstract getter methods to retrieve the