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<title>HornetQ Java EE MDB Bean Managed Transaction Example</title>
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<h1>Java EE MDB Bean Managed Transaction Example</h1>
<p>This example shows you how to send a message to an MDB configured to use Bean Managed Transactions</p>
<p>
The example will send deploy a simple MDB and demonstrate sending a message and the MDB consuming it
</p>
<p>The example leverages the JBoss Arquillian framework to run an AS 7 instance and deploy the MDB.</p>
<h2>Example step-by-step</h2>
<p><i>download AS 7.1.1.final from <a href="http://www.jboss.org/jbossas/downloads/">here</a> and install.</i></p>
<p><i>set the JBOSS_HOME property to point to AS7 install directory</i></p>
<p><i>To run the example simply type <code>mvn test</code>from the example directory</i></p>
<ol>
<li>First we need to get an initial context so we can look-up the JMS connection factory and destination objects from JNDI. This initial context will get it's properties from the <code>jndi.properties</code> file in the directory <code>config</code></li>
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initialContext = new InitialContext();
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<li>We look up the JMS queue object from JNDI</li>
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Queue queue = (Queue) initialContext.lookup("/queue/testQueue");
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<li>We look up the JMS connection factory object from JNDI</li>
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ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");
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<li>We create a JMS connection</li>
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connection = cf.createConnection();
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<li>We create a JMS session. The session is created as non transacted and will auto acknowledge messages.</li>
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Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
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<li>We create a JMS message producer on the session. This will be used to send the messages.</li>
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MessageProducer messageProducer = session.createProducer(queue);
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<li>We create a JMS text messages that we are going to send.</li>
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TextMessage message = session.createTextMessage("This is a text message");
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<li>We send messages to the queue</li>
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messageProducer.send(message);
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<li>The MDB receives the message<br />
We know the message is a TextMessage so we cast to it.
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TextMessage tm = (TextMessage)message;
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<li>The MDB gets the text and prints it
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String text = tm.getText();
System.out.println("message " + text + " received");
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<li>Now we can do something within a user transaction, lets just start and commit it
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UserTransaction tx = ctx.getUserTransaction();
if(tx != null)
{
tx.begin();
System.out.println("we're in the middle of a transaction: " + tx);
tx.commit();
}
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<li>And finally, <b>always</b> remember to close your JMS connections and resources after use, in a <code>finally</code> block. Closing a JMS connection will automatically close all of its sessions, consumers, producer and browser objects</li>
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<code>finally
{
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}
</pre>
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