cache.setDbMapping (umap);
    public User (String sid, Application app) {	this.uid = null;	this.nid = null;    	this.app = app;    	setNode (null);	cache = new Node (sid);	cache.setPrototype ("user");	sessionID = sid;	onSince = System.currentTimeMillis ();	lastTouched = onSince;    }