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Typically, primary key values are more complex than a single column. Compound primary keys are an excellent way to drill down to specific data. Using a compound primary key is more complex for both CMP and BMP entity beans. For both types of beans, you must create a primary key class that follows specific rules, and also configure your entity bean to properly use an instance of the class.

The fourth design pattern that we study with regards to aspect-oriented programming techniques is the Chain of Responsibility. We begin by providing a quick description of this pattern, and proceed by giving an implementation of the pattern using AspectJ. We then conclude this section with an evaluation of the implementation.

@Stateless public class UserLocalHomeBean implements UserLocalHome { @PersistenceContext EntityManager em;

User create(String userId, String firstName, String lastName, String userType) throws CreateException { User user = new User(userId, firstName, lastName, userType); try { em.persist(user); } catch (Exception e) { throw new CreateException(e.getMessage()); } returnuser; } User findByPrimaryKey(String primaryKey) throws FinderException { try { return (User)em.find(User.class, primaryKey); } catch (Exception e) { throw new FinderException(e.getMessage()); } } }

To provide a compound primary key for an entity bean, you must create a primary key class. In this recipe, we define a complex key for a portfolio holdings table. This key consists of a String for the portfolio name as well as a String for the symbol of an equity in the portfolio holding. Listing 3.9 shows a primary key class that meets the EJB 2.0 rules for primary key classes (and models the equity situation described).

This code throws the EJB 2 specific exceptions that may be expected by clients. You can use this session bean fa ade to mimic the home interface, thereby reducing the number of changes required on the client side. This concludes our discussion on migrating applications using CMP entity beans to the EJB 3 JPA. As we told you at the start of this section, migrating your CMP beans to JPA is the most involved of the tasks you re likely to undertake when upgrading to EJB 3. Revising your domain model, using DTOs and session facades, and the required API changes will all help you achieve your migration goal. Your EJB 2 applications may already use DTOs and session facades, in which case much of this is familiar to you. Either way, we ve provided a roadmap that will lead you down the migration trail. At this point, we know exactly what you re thinking OK, what you re probably thinking. What about all that JDBC code You guys got any tips for converting it to JPA It just so happens we do, and if you mosey on over to the next section you can see what these tips are.

The Command design pattern presented in the previous section allows the definition of commands that are executed by objects. The Chain of Responsibility design pattern is more or less an extension of this principle and allows you to group several commands in a chain. When the chain is executed, each element of the chain is visited. When visited, an element either performs a command or does nothing. A pure object-oriented, aspect-free implementation of the Chain of Responsibility design pattern generally relies on a Handler interface. Each command of a chain must implement this interface, which generally provides two methods: setSuccessor for setting the successor of the current command in the chain, and handle for performing the command. Depending on the conditions chosen by the programmer, the handle method can perform the command and delegate the call to the next element in the chain; it can also just perform the command or just delegate the call.

Almost every Java developer in the universe has used JDBC to persist data to a database. If your code also uses the DAO pattern, then migrating to the EJB 3 JPA may be a relatively painless process. Migration from JDBC requires three major tasks:

public class HoldingKey implements Serializable { Declares public CMP public String portfolioName = null; field variables public String symbol = null; public HoldingKey(){}

Identify your entities. Change the DAO implementation classes to use the EntityManager API to perform entity operations instead of using JDBC. Migrate your SQL queries to use JPQL and the EntityManager API.

The next three sections break down each of these steps, and we provide examples to illustrate exactly what you need to do.