e membership events.
Take a look at the 
<a href="#code/src/main/java/sample/cluster/simple/SimpleClusterListener.java" class="shortcut">SimpleClusterListener.java</a>
actor. 
</p>

<p>
You can read more about the cluster concepts in the 
<a href="http://doc.akka.io/docs/akka/2.4-SNAPSHOT/java/cluster-usage.html" target="_blank">documentation</a>.
</p>

<p>
To run this sample, go to the <a href="#run" class="shortcut">Run</a>
tab, and start the application main class <b><code>sample.cluster.simple.SimpleClu