docs: static Field getClassFieldByName(Class<?> clazz, String fieldName) {
          try {
              return clazz.getDeclaredField(fieldName);
          } catch (SecurityException e) {
              throw new DynamoDBMappingException(
                      "Denied access to the [" + fieldName + "] field in class [" + clazz + "].", e);
          } catch (NoSuchFieldException e) {
              return null;
          }
      }