116 lines
4.6 KiB
HTML
116 lines
4.6 KiB
HTML
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<title>HornetQ Java EE MDB Container Managed Transaction with NOT_SUPPORTED transaction Example</title>
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<h1>Java EE MDB Container Managed Transaction with NOT_SUPPORTED transaction Example</h1>
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<p>This example shows you how to send a message to an MDB</p>
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<p>The example will deploy a simple MDB and send a message. The MDB consuming it will not use a transaction.</p>
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<p>The example leverages the JBoss Arquillian framework to run a WildFly instance and deploy the MDB.</p>
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<h2>Example step-by-step</h2>
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<p><i>download WildFly 8.0.0.Final from <a href="http://wildfly.org/downloads/">here</a> and install.</i></p>
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<p><i>set the JBOSS_HOME property to point to the WildFly install directory</i></p>
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<p><i>type <code>mvn verify</code> from the example directory to run</i></p>
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<ol>
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<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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<pre class="prettyprint">
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final Properties env = new Properties();
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env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
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env.put(Context.PROVIDER_URL, "http-remoting://localhost:8080");
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initialContext = new InitialContext(env);
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</pre>
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<li>We look up the JMS queue object from JNDI</li>
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<pre class="prettyprint">
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Queue queue = (Queue)initialContext.lookup("jms/queues/testQueue");
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</pre>
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<li>We look up the JMS connection factory object from JNDI</li>
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<pre class="prettyprint">
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ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("/jms/RemoteConnectionFactory");
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</pre>
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<li>We create a JMS connection</li>
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<pre class="prettyprint">
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connection = cf.createConnection("guest", "password");
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</pre>
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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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<pre class="prettyprint">
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<code>Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);</code>
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</pre>
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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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<pre class="prettyprint">
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<code>MessageProducer messageProducer = session.createProducer(queue);</code>
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</pre>
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<li>We create a JMS text messages that we are going to send.</li>
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<pre class="prettyprint">
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<code> TextMessage message = session.createTextMessage("This is a text message");</code>
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</pre>
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<li>We send messages to the queue</li>
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<pre class="prettyprint">
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<code>messageProducer.send(message);</code>
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</pre>
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<li>The MDB receives the message<br />
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We know the message is a TextMessage so we cast to it.
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</li>
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<pre class="prettyprint">
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<code>TextMessage tm = (TextMessage)message;</code>
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</pre>
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<li>The MDB gets the text and prints it
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</li>
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<pre class="prettyprint">
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<code>String text = tm.getText();
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System.out.println("message " + text + " received");
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</code>
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</pre>
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<li>We look at the transaction to make sure there isn't one
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</li>
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<pre class="prettyprint">
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<code>Transaction tx = tm.getTransaction();
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if(tx == null)
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{
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System.out.println("tx is null, just as expected");
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}
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</code>
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</pre>
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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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<pre class="prettyprint">
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<code>finally
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{
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if (initialContext != null)
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{
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initialContext.close();
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}
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if (connection != null)
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{
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connection.close();
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}
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}</code>
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</pre>
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</ol>
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</body>
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