public EmployeeService(){
		SellXMLHandler sl=new SellXMLHandler();
		BookXMLHandler bk=new BookXMLHandler();
		sellFactory = new ObjectFactory();
		try {
			sellList=(SellListRoot)sl.readFromFile();
			bookList=(BookListRoot)bk.readFromFile();
		} catch (JAXBException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (sellList == null){
			sellList = sellFactory.createSellListRoot();
		}
	
	}