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a rollback. If the validation fails, you want to indicate as such by throwing an exception. However, the data validation would not require a rollback. For example, registering a user would require validation of user data before persisting it in a data store. You might want to throw an exception upon invalid data, and no rollback would be needed because no data has been persisted.

of ActivationConfigProperty instances. ActivationConfigProperty is defined as follows:

public @interface ActivationConfigProperty { String propertyName(); String propertyValue(); }

Each activation property is essentially a name-value pair that the underlying messaging provider understands and uses to set up the MDB. The best way to grasp how this works is through example. Here, we provide three of the most common JMS activation configuration properties: destinationType, connectionFactoryJndiName, and destinationName:

To avoid causing a rollback, throw an application exception from your business method. An application exception is any exception that does not subclass RuntimeException or RemoteException. Consider the registerUser() business method:

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@MessageDriven( name="ShippingRequestProcessor", activationConfig = { @ActivationConfigProperty( propertyName="destinationType", propertyValue="javax.jms.Queue"), @ActivationConfigProperty( propertyName="connectionFactoryJndiName", propertyValue="jms/QueueConnectionFactory" ), @ActivationConfigProperty( propertyName="destinationName", propertyValue="jms/ShippingRequestQueue") } )

First, the destinationType property tells the container this JMS MDB is listening to a queue. If we were listening to a topic instead, the value could be specified as javax.jms.Topic. Next, connectionFactoryJndiName specifies the JNDI name of the connection factory that should be used to create JMS connections for the MDB. Finally, the destinationName parameter specifies that we are listening for messages arriving at a destination with the JNDI name of jms/ShippingRequestQueue. There are a few other configuration properties for JMS that we ll describe in the sections that follow. Visualizing what happens behind the scenes can help you remember these configuration properties. The container does something similar to our JMS message consumer setup steps (as shown in listing 4.2) to bootstrap the MDB. Most of the method parameters that we specify during those steps are made available as configuration properties in the MDB world.

public void registerUser( String user, String password ) throws InvalidUserDataException { if( user == null || password == null ) throw new InvalidUserDataException(); }

acknowledgeMode Messages are not actually removed from the queue until the consumer acknowledges them. There are many modes through which messages can be acknowledged. By default, the acknowledge mode for the underlying JMS session is assumed to be AUTO_ACKNOWLEDGE, which means that the session acknowledged messages on our behalf in the background. This is the case for our example (since we omitted this property). All of the acknowledgment modes supported by JMS are listed in table 4.1. We could change the acknowledge mode to DUPS_OK_ACKNOWLEDGE (or any other acknowledge mode we discuss in table 4.1) using the following:

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