As @mirabilos pointed out in auth-server#55 the resource server doesn't generate a meaningful log message if it refuses to validate an access token because of an unreachable auth server.
Yes, it should log such a scenario. But just a simple log message, without stacktrace. Otherwise the log will be bloated after a few minutes on a busy resource server.
As @mirabilos pointed out in auth-server#55 the resource server doesn't generate a meaningful log message if it refuses to validate an access token because of an unreachable auth server.