OpenId login screen does not display

I'm using OBP API develop branch, Kafka integrated.

I've set up a test OpenID Connect server instance (https://github.com/mitreid-connect/OpenID-Connect-
Java-Spring-Server/) and I've tried to integrate OBP API with it.

My props look like this:

allow_openidconnect=true
openidconnect.clientSecret=secret
openidconnect.clientId=client
openidconnect.domain=localhost
[obp-api_openid_connect.txt](https://github.com/OpenBankProject/OBP-API/files/502437/obp-api_openid_connect.txt)

openidconnect.callbackURL=http://127.0.0.1:8080/my/logins/openidconnect
openidconnect.login_ui_url=http://localhost:8280/openid-connect-server-webapp/login
openidconnect.button_logo=http://wiki.openid.net/f/openid-logo-wordmark.png (10KB)

When I try to login via
http://localhost:8080/user_mgt/login
nothing happens, no login screen shows up.

The OpenID server is ok, I've tested it with a separate client app.
I'm attaching the OBP API log.
obp-api_openid_connect.txt

1. Maybe it's about the 'login redir: Empty' seen in logs?
2. Or maybe it's about the 'ERROR - KafkaConsumer: timeout ' msg. There is an json request inserted into the Request Kafka queue. It looks like this:
   {"getUser":{"email":"admin","password":"password"}}
   But then - why is this request posted to kafka? With password?

I've discussed this issue with Petar Bozin via slack.

Inizia dal punto di ingresso /user_mgt/login e rivedi le proprietà OpenID Connect fornite, in particolare login_ui_url e callbackURL. Riproduci la schermata di accesso mancante con il log OBP API allegato, verificando i messaggi “login redir: Empty” e di timeout di KafkaConsumer. L’attività è completata quando viene visualizzata la schermata di accesso OpenID e il flusso di autenticazione termina senza l’errore segnalato.