docs: public static boolean hasNull(Object bean) {
  		final Field[] fields = ClassUtil.getDeclaredFields(bean.getClass());
  
  		Object fieldValue = null;
  		for (Field field : fields) {
  			field.setAccessible(true);
  			try {
  				fieldValue = field.get(bean);
  			} catch (Exception e) {
  				//ignore
  			}
  			if (null == fieldValue) {
  				return true;
  			}
  		}
  		return false;
  	}