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<title>ActiveMQ Artemis Message Expiration Example</title>
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<h1>JMS Expiration Example</h1>
<pre>To run the example, simply type <b>mvn verify</b> from this directory, <br>or <b>mvn -PnoServer verify</b> if you want to start and create the server manually.</pre>
<p>This example shows you how to configure ActiveMQ Artemis so messages are expipired after a certain time.</p>
<p>Messages can be retained in the messaging system for a limited period of time before being removed.
JMS specification states that clients should not receive messages that have been expired (but it does not guarantee this will not happen).</p>
<p>ActiveMQ Artemis can assign a <em>expiry address</em> to a given queue so that when messages are expired, they are removed from the queue and
routed to this address. These "expired" messages can later be consumed for further inspection.
<p>
The example will send 1 message with a short <em>time-to-live</em> to a queue. We will wait for the message to expire and checks that the message
is no longer in the queue it was sent to.
We will instead consume it from an <em>expiry queue</em> where it was moved when it expired.
</p>
<h2>Example setup</h2>
<p>Expiry destinations are defined in the configuration file <a href="server0/broker.xml">broker.xml</a>:</p>
<pre class="prettyprint">
<code><address-setting match="jms.queue.exampleQueue">
<expiry-address>jms.queue.expiryQueue</expiry-address>
</address-setting>
</code>
</pre>
<p>This configuration will moved expired messages from the <code>exampleQueue</code> to the <code>expiryQueue</code></p>
<p>ActiveMQ Artemis allows to specify either a <code>Queue</code> by prefixing the <code>expiry-address</code> with <code>jms.queue.</code>
or a <code>Topic</code> by prefixing with <code>jms.topic.</code>.<br />
In this example, we will use a <code>Queue</code> to hold the expired messages.</p>
<p>Since we want to consume messages from this expiryQueue, we also need to add a JNDI binding to perform a lookup.
This is configured in <a href="server0/activemq-jms.xml">activemq-jms.xml</a></p>
<pre class="prettyprint">
<code><queue name="expiryQueue">
<entry name="/queue/expiryQueue"/>
</queue></code>
</pre>
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