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As we explain each logical step of this code in the following sections, we ll go through a large subset of the JMS API components and see usage patterns Note that for simplicity we have removed the code for exception handling Retrieving the connection factory and destination In JMS, administrative objects are similar to JDBC javaxsqlDataSource objects These are resources that are created and configured outside the code and stored in JNDI JMS has two administrative objects: javaxjmsConnectionFactory and javaxjmsDestination, both of which we use in listing 41 We then retrieve the connection factory using dependency injection with the @Resource annotation, and the connection factory encapsulates all the configuration information needed to connect to MOM We also inject the queue to forward the shipping request to, aptly named, ShippingRequestQueue.

private EntityContext context; private Connection con; // business method public AccountDetails getDetails() { try { loadCustomerIds(); } catch (Exception ex) { throw new EJBException("loadCustomerIds: " +ex.getMessage()); } return new AccountDetails( accountId, type, description, balance, creditLine, beginBalance, beginBalanceTimeStamp, customerIds); } public public public public public BigDecimal getBalance() { return balance; } String getType() { return type; } BigDecimal getCreditLine() { return creditLine; } void setType(String type) { this.type = type; } void setDescription(String d) { this.description = d; }

With EJB 3, using resources is much easier; you don t have to deal with the complexity of JNDI or configure resource references in deployment descriptors 5 discusses dependency injection in greater detail The next step in listing 41 is creating a connection to MOM and getting a new JMS session Opening the connection and session The javaxjmsConnection object represents a live MOM connection, which we create using the createConnection method of the connection factory Connections are thread-safe and designed to be sharable because opening a new connection is resource intensive A JMS session (javaxjmsSession), on the other hand, provides a single-threaded, task-oriented context for sending and receiving messages We create a session from the connection using the createSession method The first parameter of the method specifies whether the session is transactional.

Using session beans to encapsulate access to entity beans is an accepted practice by all EJB developers. The session bean uses its transaction for the commitMultipleEntities() business method to contain the two updates of the entity beans. In order to keep the multiple entity bean updates within a single transaction, make sure that each entity bean s transaction attribute is not set to RequiresNew. If you use RequiresNew, the EJB container will create a separate transaction for each entity bean update, breaking the single-transaction requirement. By propagating the business method s transaction to the entity beans, all the updates can be rolled back together. This ensures that all entity beans are updated if and only if they all succeed in the update.

We ve decided that our session should be transactional and therefore set the parameter to true This means that the requests for messages to be sent won t be realized until either the session s commit method is called or the session is closed (If the session isn t transactional, messages will be sent as soon as the send method is invoked) The second parameter of the createSession method specifies the.

acknowledge mode and only has an effect for nontransactional sessions receiving messages, which we ll discuss later. Having set up the session, we are now ready to take on the meat of the matter: sending the message. Preparing and sending the message The session is not directly used for sending or receiving messages (we could argue that having it do so would simplify the JMS API). Instead, a javax.jms.MessageProducer needed to send messages to the shipping request queue is constructed using the session s createProducer method. Then we create and populate the javax.jms.Message to be sent. In our example, we send the Serializable Java object ShippingRequest to Turtle, so the most appropriate message type for us is javax.jms.ObjectMessage (which we create using the createObjectMessage method). We then create an instance of the ShippingRequest object and set the item number, shipping address, shipping method, and insurance amount fields. Once ShippingRequest is set up, we set it as the payload of the message using setObject. Finally, we instruct the message producer to send the message out using the send method. Releasing resources A large number of resources are allocated under the hood for both the session and connection objects, so it is important to explicitly close both once we ve finished with them, as we do with

5.1 Tuning the container transaction control for your EJB 5.16 Updating multiple databases in one transaction

session.close(); connection.close();

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