public PropertiesManager() {
		FileInputStream propFile = null;
		try {
			propFile = new FileInputStream(FILENAME);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		properties = new Properties(System.getProperties());
		try {
			properties.load(propFile);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		System.setProperties(properties);
	}