code: protected Field findField() throws FinderFieldNotFoundException {
  
      try {
        if (fieldName != null) {
          return beanType.getField(fieldName);
        }
  
        try {
          return beanType.getField("find");
  
        } catch (NoSuchFieldException e) {
          return beanType.getField("FIND");
        }
      } catch (NoSuchFieldException e) {
        throw new FinderFieldNotFoundException(e);
      }
    }
docs: Find and return the "find" field.