docs: public static Field getDeclaredField(Class<?> clazz, String fieldName) throws SecurityException {
  		if (null == clazz || StrUtil.isBlank(fieldName)) {
  			return null;
  		}
  		try {
  			return clazz.getDeclaredField(fieldName);
  		} catch (NoSuchFieldException e) {
  			// e.printStackTrace();
  		}
  		return null;
  	}