All listeners are in fact a ComponentPlugin so they must be configured as below:

<?xml version="1.0" encoding="ISO-8859-1"?>

<configuration>

...

  <external-component-plugins>

    <!-- The full qualified name of the ListenerService --> 

    <target-component>org.exoplatform.services.listener.ListenerService</target-component>



    <component-plugin>

    <!-- The name of the listener that is also the name of the target event -->

      <name>${name-of-the-target-event}</name>

      <!-- The name of the method to call on the ListenerService in order to register the Listener -->

      <set-method>addListener</set-method>

      <!-- The full qualified name of the Listener -->

      <type>${the-FQN-of-the-listener}</type>

    </component-plugin>



  </external-component-plugins>

</configuration>