2014-10-31 06:20:28 -04:00
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2014-11-19 03:44:57 -05:00
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<title>ActiveMQ Java EE Injected JMSContext Example</title>
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2014-10-31 06:20:28 -04:00
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<h1>Java EE Injected JMSContext Example</h1>
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<p>This example shows you how to inject a JMSContext into an MDB and use it to send a reply to a JMS Client</p>
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<h2>Wildfly configuration</h2>
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<p>The example leverages the JBoss Arquillian framework to run an Wildfly 8 instance and deploy the MDB.</p>
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<h2>Example step-by-step</h2>
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<p><i>download The latest Wildfly 8 from <a href="http://www.wildfly.org/download/">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>To run the example simply type <code>mvn test</code>from the example directory</i></p>
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<ol>
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<li> Firstly in the MDB we inject the JMSContext. This will use the Default Connection Factory configured.
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</li>
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<pre class="prettyprint">
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<code>
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@Inject
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javax.jms.JMSContext context;</code>
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<li>We then map the reply queue as a resource.
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</li>
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<pre class="prettyprint">
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<code>
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@Resource(mappedName = "java:/queue/replyQueue")
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Queue replyQueue;</code>
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</pre>
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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.</li>
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<pre class="prettyprint">
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<code>
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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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</code>
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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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<code>Queue queue = (Queue)initialContext.lookup("jms/queues/testQueue");</code>
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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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<code>ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("jms/RemoteConnectionFactory");</code>
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</pre>
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<li>We create a JMSContext inside the try-with-resource block so it auto closes</li>
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<pre class="prettyprint">
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<code>
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try
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(
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// Step 6.Create a JMS Connection inside the try-with-resource block so it will auto close
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JMSContext context = cf.createContext("guest", "password")
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)
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</code>
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</pre>
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<li>We create a JMS Producer and send a String as a message.</li>
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<pre class="prettyprint">
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<code>context.createProducer().send(queue, "This is a text message");</code>
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</pre>
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<li>We start the context so we can receive messages.</li>
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<pre class="prettyprint">
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<code>context.start();</code>
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</pre>
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<li>We look up the reply queue.</li>
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<pre class="prettyprint">
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<code>Queue replyQueue = (Queue)initialContext.lookup("jms/queues/replyQueue");</code>
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</pre>
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<li>We receive the body, as a String, of the reply message.</li>
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<pre class="prettyprint">
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<code> String text = context.createConsumer(replyQueue).receiveBody(String.class);</code>
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</pre>
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<li>And finally, close the initial context.</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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}</code>
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</pre>
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</ol>
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