The JMS notifier uses the MessagePayloadProxy to retreive the payload to send in the notification. The problem is that neither the configuration nor the ESB Plugin tool supports setting the attributes in the config to support this.
It is possible to code this manually but whenever you use the ESB Plugin, it gets removed.
<target class="NotifyQueues" get-payload-location="ReplyMessage">
<queue connection-factory="XAConnectionFactory" jndiName="/queue/SYSTEM.REPLY"/>