}
        return null;
    }

    protected void parseJwtClaim(final String jwtClaim, final Map<String, Object> attributes) throws IOException {
        try (final JsonParser jsonParser = jsonFactory.createJsonParser(jwtClaim)) {
            while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
                final String name = jsonParser.getCurrentName();
                if (name != null) {