Advise: What are key differences to take into consideration when running keycloak locally and on docker?

[jangaraj]

"No access_token" trying to integrate Keycloak with ClassLink

You have nice backtrace, so you can track it. E.g. at org.keycloak.broker.oidc.OIDCIdentityProvider.verifyAccessToken(OIDCIdentityProvider.java:515) So accessToken is null and backtrack it back to find more details.