pms = new Hashtable();
pms = CollectionsFactory.current().createMap();
	public JDOStorageFormat() {		super();		pms = new Hashtable();		// close database connection when application exits		Runtime.getRuntime().addShutdownHook(new Thread() {			public void run() {				Iterator iter = pms.values().iterator();//				while (iter.hasNext()) {//					((PersistenceManager)iter.next()).close();//				}			}		});	}