public void removePluginManagerListener( PluginManagerListener listener )
    {
        pluginManagerListeners.remove( listener );
    }
Deregisters a PluginManagerListener, which will no longer receive events.

When the listener was never added, this method will have no effect.

@param listener the listener to be notified (cannot be null).
xmppserver/src/main/java/org/jivesoftware/openfire/container/PluginManager.java