155 lines
5.7 KiB
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155 lines
5.7 KiB
HTML
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<title>HornetQ Java EE MDB Send Example</title>
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<h1>Java EE MDB TX Send Example</h1>
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<p>This example shows you how to send a message to an MDB that returns a reply using the same XA transaction.</p>
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<p>The example will send deploy a simple MDB and demonstrate sending a message and the MDB consuming it.</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>The MDB creates a JMS connection
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</li>
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<pre class="prettyprint">
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<code>conn = connectionFactory.createConnection();
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</code>
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</pre>
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<li>The MDB creates a JMS session
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</li>
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<pre class="prettyprint">
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<code>Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
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</code>
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</pre>
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<li>The MDB creates a JMS message producer
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</li>
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<pre class="prettyprint">
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<code>MessageProducer producer = sess.createProducer(replyQueue);
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</code>
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</pre>
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<li>The MDB creates a text message and sends it to the reply queue
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</li>
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<pre class="prettyprint">
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<code>producer.send(sess.createTextMessage("this is a reply"));
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</code>
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</pre>
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<li>The Client creates a JMS message consumer using the injected reply queue
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</li>
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<pre class="prettyprint">
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<code>MessageConsumer messageConsumer = session.createConsumer(replyQueue);
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</code>
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</pre>
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<li>The Client starts the connection so it can receive messages
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</li>
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<pre class="prettyprint">
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<code>connection.start();
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</code>
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</pre>
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<li>The Client receives the reply and prints it out
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</li>
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<pre class="prettyprint">
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<code>message = (TextMessage) messageConsumer.receive(5000);
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System.out.println("message.getText() = " + message.getText());
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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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