private void createJFinalConfig(String configClass) {
		if (configClass == null) {
			throw new RuntimeException("please set configClass in the web.xml");
		}
		
		try {
			Object o = Class.forName(configClass).newInstance();
			if (o instanceof JFinalConfig) {
				jfinalConfig = (JFinalConfig) o;
			}
			else {
				throw new RuntimeException("Can not new instance by configClass : "+configClass);
			}
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}