for (final Field field : clazz.getDeclaredFields()) {
            final String fname = field.getName();
            if (fieldDescCache.containsKey(fname)) {
                continue;
            }
            setFieldAccessible(field);
            final FieldDescImpl fieldDesc = new FieldDescImpl(this, field);
            fieldDescCache.put(fname, fieldDesc);
            if (!FieldUtil.isInstanceField(field)) {