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Check whether you really need stateful session beans and have to replicate the session for them. Stateful session bean replication requires expensive serialization, propagation of the serialization, and deserialization of the session state. Make sure any required session state is minimal. Most vendors recommend that you not store stateful objects larger than 4KB. When storing a state, it is better to store a key rather than a large entity object in the session state. Perform some testing on your applications if you think you need more state than this. The common technique to get around the 4KB limit is to store only one or more session keys in the state, and use these to retrieve the larger data on the server where it is used.

Don t hard-code any vendor-specific annotations to enable session replication. Instead, use vendor-specific deployment descriptors. The client code for an EJB needs to know that you are using clustered application server instances and enabling session replication. Therefore, you have to provide the URL for the clustered JNDI server or application server that knows about this information.

Message-driven beans must declare their destination type in their deployment descriptor from which they will be receiving JMS messages. Recipe 2.3 showed how to use XDoclet to generate the deployment descriptor for EJBs. Additionally, you can specify the destination type for a message-driven bean in its class source and add it to the generated XML. Please read recipe 2.3 before using this one.

JBoss AOP uses the tag <precedence> in the XML file jboss-aopxml Spring AOP provides an interface (orgspringframeworkcoreOrdered) that must be implemented to specify the order In all cases, the order is global, and there is no guarantee that some orderings will not be left unspecified At first glance, it may appear that the precedence feature adopted by AspectJ and JBoss is the most powerful, since it allows the ordering of aspects declaration The precedence relationship is transitive, and the aspect system will determine the final order by looking at all the declared orders of all the aspects However, we think that the precedence construct can lead to maintainability issues when refactoring the program (ie, when adding, removing, renaming, or changing aspects) It indeed may happen that all the precedence declarations would need to be changed across the program.

@Id @GeneratedValue(strategy=GenerationType.TABLE, generator="USER_TABLE_GENERATOR") @Column(name="USER_ID") protected Long userId;

Default primary key generation strategy The last option for key generation is to let the provider decide the best strategy for the underlying database by using the AUTO specification as follows:

To generate the XML for the message destination type, add the destination-type attribute to the class-level @ejb.bean XDoclet tag for your message-driven bean class. The following code does this for the MessageBean class:

@Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="USER_ID") protected Long userId;

Consequently, a centralized ordering declaration like JAC s seems to be reasonable for more complex programs Hence, we advise programmers to use the precedence feature of AspectJ and JBoss in a centralized way by creating a specific aspect for managing all other aspect ordering Unfortunately, the Spring ordering feature would not allow any centralized ordering declaration..

This is a perfect match for automatic table creation because the underlying database objects required will be created by the JPA provider.

You d assume that if Oracle were the underlying database, the persistence provider probably would choose SEQUENCE as the strategy; if SQL Server were the underlying database, IDENTITY would likely be chosen on your behalf. However, this may not be true, and we recommend that you check the documentation of your persistence provider. For example, TopLink Essentials uses a table generator as the default autogenerator for all databases.

/** * @ejb.bean * name="MessageBean" * type="MDB" * destination-type="javax.jms.Queue" */ public class MessageBean implements MessageDrivenBean, MessageListener {

Keep in mind that although generated values are often used for surrogate keys, you could use the feature for any persistence field or property. Before we move on to discussing entity relations, we ll tackle the most complicated case of mapping basic entity data next mapping embeddable objects.