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<title>ActiveMQ Artemis JMS Clustered Topic Example</title>
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<h1>JMS Clustered Topic 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 demonstrates a JMS Topic deployed on two different nodes. The two nodes are configured to form a cluster.</p>
<p>We then create a subscriber on the topic on each node, and we create a producer on only one of the nodes.</p>
<p>We then send some messages via the producer, and we verify that <b>both</b> subscribers receive all the
sent messages.</p>
<p>A JMS Topic is an example of <b>publish-subscribe</b> messaging where all subscribers receive all the
messages sent to the topic (assuming they have no message selectors).</p>
<p>This example uses JNDI to lookup the JMS Queue and ConnectionFactory objects. If you prefer not to use
JNDI, these could be instantiated directly.
<p>Here's the relevant snippet from the server configuration, which tells the server to form a cluster between the two nodes
and to load balance the messages between the nodes.</p>
<p>This example differes from different-topic as it will use an URI to define the cluster connection.</p>
<pre class="prettyprint"><code><cluster-connection-uri name="my-cluster" address="uri="multicast://my-discovery-group?messageLoadBalancingType=STRICT;retryInterval=500;connectorName=netty-connector;maxHops=1"/></code></pre>
<p>For more information on ActiveMQ Artemis load balancing, and clustering in general, please see the clustering
section of the user manual.</p>
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