class JwtUserIdKeyResolver implements KeyResolver {

    @Override
    public String resolve(HttpServerExchange exchange) {<FILL_FUNCTION_BODY>}
}

        String key = null;
        Map<String, Object> auditInfo = exchange.getAttachment(AttachmentConstants.AUDIT_INFO);
        if(auditInfo != null) {
            key = (String)auditInfo.get(Constants.USER_ID_STRING);
        }
        return key;
    
<no_super_class>