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<title>JMS Clustered Stand-alone Example</title>
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<h1>JMS Clustered Stand-alone Example</h1>
<p>This example demonstrates a JMS Topic deployed on three different nodes.
The three nodes are configured to form a cluster.</p>
<p>Subscribers for the topic are created on each node, and a producer is created on only one of the nodes.</p>
<p>Some messages are sent by the producer, and we verify that <strong>all</strong> subscribers receive all the
sent messages.</p>
<p>This example uses ActiveMQ's default stand-alone clustered configuration.
The relevant snippet from the server configuration, which tells the servers to form a cluster between the three nodes
and to load balance the messages between the nodes is:</p>
<pre class="prettyprint">
<code><cluster-connection name="my-cluster">
<address>jms</address>
<discovery-group-ref discovery-group-name="dg-group1"/>
</cluster-connection>
</code>
</pre>
<h2>Example step-by-step</h2>
<p><i>To run the example, simply type <code>mvn verify -Pexample</code> from this directory</i>. This will
automatically start the 3 cluster nodes, each with its specific configuration.</p>
<p>To start the tests <em>manually</em>, the following steps are:</p>
<ul>
<li>create 4 terminals (3 for the servers and 1 for the example client)</li>
<li>in the first terminal, go to the <code>bin</code> directory and start the first server (with default configuration):
<pre class="prettyprint"><code>./run.sh ../config/stand-alone/clustered</code></pre>
<li>in the second terminal, start the second server:
<pre class="prettyprint"><code>export CLUSTER_PROPS="-Ddata.dir=../data-server2 -Djnp.port=2099 -Djnp.rmiPort=2098 -Dactivemq.remoting.netty.port=6445 -Dactivemq.remoting.netty.batch.port=6455"
./run.sh ../config/stand-alone/clustered</code></pre>
<li>in the third terminal, start the third server (with default configuration):
<pre class="prettyprint"><code>export CLUSTER_PROPS="-Ddata.dir=../data-server3 -Djnp.port=3099 -Djnp.rmiPort=3098 -Dactivemq.remoting.netty.port=7445 -Dactivemq.remoting.netty.batch.port=7455"
./run.sh ../config/stand-alone/clustered</code></pre>
<li>finally, in the fourth terminal, start the example
<pre class="prettyprint"><code>./build.sh runRemote</code> (or <code>build.bat runRemote</code> on windows)</pre>
<p>The example connects to the three cluster nodes using JNDI (which are retrieved from
<a href="server0/client-jndi.properties">server0</a>, <a href="server1/client-jndi.properties">server1</a>, and
<a href="server2/client-jndi.properties">server2</a>' s JNDI properties file). The JNDI ports were specified
using the environment property <code>jnp.port</code> (or 1098 by default) when starting the 3 cluster nodes.</p>
<p>For a description of the example code, please read the <a href="../clustered-topic/readme.html">
clustered-topic example</a> which is very similar (it has 2 nodes while this example has 3 nodes).
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