code: public MessageDestinationType<ApplicationDescriptor> getOrCreateMessageDestination()
     {
        List<Node> nodeList = model.get("message-destination");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new MessageDestinationTypeImpl<ApplicationDescriptor>(this, "message-destination", model, nodeList.get(0));
        }
        return createMessageDestination();
     }
docs: If not already created, a new <code>message-destination</code> element will be created and returned.
  Otherwise, the first existing <code>message-destination</code> element will be returned.
  @return the instance defined for the element <code>message-destination</code>