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<html>
<head>
<title>HornetQ Java EE MDB Bean Managed Transaction Example</title>
<link rel="stylesheet" type="text/css" href="../../common/common.css" />
<link rel="stylesheet" type="text/css" href="../../common/prettify.css" />
<script type="text/javascript" src="../../common/prettify.js"></script>
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<body onload="prettyPrint()">
<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>
<h2>JBoss AS configuration</h2>
<p>Please refer to HornetQ Quickstart guide to <a href="../../../docs/quickstart-guide/en/html_single/index.html#installation.jboss">install it in JBoss AS 5<a></p>
<h2>Example step-by-step</h2>
<p><i>To deploy and start the server, simply type <code>./build.sh deploy</code> (or <code>build.bat deploy</code> on windows) from the example directory</i></p>
<p><i>To run the example, simply type <code>./build.sh</code> (or <code>build.bat</code> on windows) from the example directory</i></p>
<p><i>To remove the example profile, simply type <code>./build.sh undeploy</code> (or <code>build.bat undeploy</code> on windows) from the example directory</i></p>
<p><i> ** make sure that JBOSS_HOME is set to the JBoss installation 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>
<pre class="prettyprint">
initialContext = new InitialContext();
</pre>
<li>We look up the JMS queue object from JNDI</li>
<pre class="prettyprint">
Queue queue = (Queue) initialContext.lookup("/queue/testQueue");
</pre>
<li>We look up the JMS connection factory object from JNDI</li>
<pre class="prettyprint">
ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");
</pre>
<li>We create a JMS connection</li>
<pre class="prettyprint">
connection = cf.createConnection();
</pre>
<li>We create a JMS session. The session is created as non transacted and will auto acknowledge messages.</li>
<pre class="prettyprint">
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
</pre>
<li>We create a JMS message producer on the session. This will be used to send the messages.</li>
<pre class="prettyprint">
MessageProducer messageProducer = session.createProducer(queue);
</pre>
<li>We create a JMS text messages that we are going to send.</li>
<pre class="prettyprint">
TextMessage message = session.createTextMessage("This is a text message");
</pre>
<li>We send messages to the queue</li>
<pre class="prettyprint">
messageProducer.send(message);
</pre>
<li>The MDB receives the message<br />
We know the message is a TextMessage so we cast to it.
</li>
<pre class="prettyprint">
TextMessage tm = (TextMessage)message;
</pre>
<li>The MDB gets the text and prints it
</li>
<pre class="prettyprint">
String text = tm.getText();
System.out.println("message " + text + " received");
</pre>
<li>Now we can do something within a user transaction, lets just start and commit it
</li>
<pre class="prettyprint">
UserTransaction tx = ctx.getUserTransaction();
if(tx != null)
{
tx.begin();
System.out.println("we're in the middle of a transaction: " + tx);
tx.commit();
}
</pre>
<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>
<pre class="prettyprint">
<code>finally
{
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}
</pre>
</ol>
</body>
</html>