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Quarkus OIDC Keycloak provider leads to a blank screen

I recently migrated to Quarkus 3.9.2 on a very small project. Got pretty much everything to work without trouble except for the Quarkus Keycloak Devservice extension.

When I try to authentify through Keycloak Provider as I used to do, I simply obtain a blank screen with no option. I know that the process does not complete normally as I'm not logged in and Swagger UI example requests on my protected endpoints don't work.

  1. Select Keycloak Provider for Authentication


  1. Fill in the login form



URL of the Login form: http://localhost:45180/realms/quarkus/protocol/openid-connect/auth?client_id=quarkus-app&redirect_uri=http%3A%2F%2Flocalhost%3A8080%2Fq%2Fdev-ui%2Fio.quarkus.quarkus-oidc%2Fkeycloak-provider&scope=openid&response_type=code&response_mode=query&prompt=login&nonce=bZeJhx4&state=pgJp1r6_quarkus_quarkus-app

  1. Get redirected to the blank screen


Here is my file that has not been changed during the migration:


Some specific details

  • Users and roles are correctly created in the Realm at the launch of the Keycloak container
  • Users all have a password correctly assigned in my Realm
  • I've already tried to use different version of the Keycloak image ( but it didn't change anything.

I'll take any hint, thank you!


  • I confirmed that this was patched with Quarkus 3.9.3. My problem is solved.