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Unlike stateless session beans, stateful session beans guarantee that a client can expect to set the internal state of a bean and count on the state being maintained between any number of method calls. The container makes sure this happens by doing two important things behind the scenes. Maintaining the session First, the container ensures that a client can reach a bean dedicated to it across more than one method invocation. Think of this as a phone switchboard that makes sure it routes you to the same customer service agent if you call a technical support line more than once in a given period of time (the period of time is the session ). Second, the container ensures that bean instance variable values are maintained for the duration of a session without your having to write any session maintenance code. In the customer service example, the container makes sure that your account information and call history in a given period of time automatically appear on your agent s screen when you call technical support. This automagic maintenance of session state is a huge leap from having to fiddle with the HTTP session, browser cookies, or hidden HTML form variables to try to accomplish the same thing. As we ll see in the coming code samples, you can develop stateful beans as if you are developing in a Hello World application, not a web application with verbose code to maintain session state. The ActionBazaar ordering process is a great example for stateful session beans since it is broken up into four steps, each of which correspond to a screen presented to the user:

Adding items to the order. If the user started the ordering process by clicking the Order Item button on the page displaying an item won, the item is automatically added to the order. The user can still add additional items in this step. Specifying shipping information, including the shipping method, shipping address, insurance, and so on. Adding billing information, such as credit card data and the billing address. Confirming the order after reviewing the complete order, including total cost.

In the case of the BMP bean, acquiring a primary key value from a sequence is just a matter of completing an additional JDBC call. And after retrieving a primary key value, the BMP bean goes on to insert the new entity data into the database (because this is an ejbCreate() method). The CMP bean relies on the EJB container to provide the value of the primary key. In this case, we simply set up the bean and its deployment descriptor in the normal CMP entity bean way. However, in the vendor-specific descriptor, we indicate how the primary key value is acquired (and we also set up the schema mapping of the bean). For instance, we used a Weblogic container for this example. One of the vendor files, weblogic-cmp-rdbms-jar.xml, contains a snippet of XML specifying a database sequence for generating our primary key:

In EJB 3, we use the EntityManager API to perform entity operations such as persisting, finding, and removing entities. In EJB 2 the home interface acted as a factory interface to provide methods to create, remove, and find entity bean instances. Clients used these methods to persist, remove, and query bean instances. In the new EJB 3 world, client applications should be modified to use the EntityManager API. Let s say we have an EJB 2 newUser method in the BazaarAdminBean that is a session fa ade used to create an instance of a User entity bean as follows:

With the four criteria defined by Hannemann and Kiczales, we can evaluate our implementation as follows. Locality: The class that receives commands is free from any code managing these commands. This code is located in the AbstractCommandAspect abstract aspect. The calls to commands are handled by concrete aspects that extend AbstractCommandAspect. Reusability: The management of commands is reused systematically.

public void newUser(UserDTO user) throws CreateException, FinderException, NamingException { User userLocal = getUserLocalHome().create( user.getUserId(), user.getFirstName(), user.getLastName(), user.getUserType()); ... }

<automatic-key-generation> <generator-type>ORACLE</generator-type> <generator-name>test_sequence</generator-name> <key-cache-size>10</key-cache-size> </automatic-key-generation>

Our example code uses a DTO named UserDTO. After migration, the client code (where User is an entity) will look much simpler:

public void newUser(User user) { getEntityManager().persist(user); }

Composition transparency: The aspect is not invasive. The behavior of the classes that receives commands is extended, but not modified. (Un)pluggability: The link between the commands and the receivers of a command is weak. The pointcuts for receivers and executions define precisely where the design pattern must be integrated.

2.5 Generating a primary key class 3.1 Using a data source 3.2 Creating EJB 2.0 container-managed persistence 3.5 Using a compound primary key for your entity beans

Similarly, you can migrate other operations, such as removal, or queries to use the EntityManager API. You have to remove the client code to handle exceptions such as CreateException and FinderException that were previously required to be handled in CMP entity beans but are no longer imposed. Translating entity home to a session fa ade It s fairly effortless to migrate the home interface to a session fa ade by moving all factory methods such as create, remove, and find to this fa ade. We first create a UserLocalHome interface:

public interface UserLocalHome { User create(String userId, String firstName, String lastName, String userType) throws CreateException; User findByPrimaryKey(String primaryKey) throws FinderException; Collection findAll() throws FinderException; Collection findByFirstName(String name) throws FinderException; }

This interface is exactly the same as before except it does not extend EJBLocalHome. The session bean implements the UserLocalHome interface and implements all factory methods using the EntityManager API as follows: