[keycloak-user] Error controller is not invoked if authentication failed

Hello, I'm migrating our application from Spring Boot 1.5.19 / Keycloak 3.4.3 to Spring Boot 2.1.2 / Keycloak 4.8.3. I'm currently facing the problem that if authentication fails (invalid token), the error controller is not invoked (BasicErrorController by default). The reason is that when authentication fails, the request is redirected to error controller, and the security filters are invoked again. Because the authorization header is still there, KeycloakAuthenticationProcessingFilter fails again. In older versions of Spring Boot / Keycloak security filters are not invoked after request is redirected to error controller. Basic authentication works as expected in both old and new versions, seemingly because BasicAuthenticationFilter extends OncePerRequestFilter, which skips filter for error URI (skipDispatch method). I created example applications with tests that reproduce the problem, see [1] and [2]. Am I missing some configuration? Or is this a bug? [1] https://github.com/htfv/examples/tree/master/spring-boot-1-keycloak [2] https://github.com/htfv/examples/tree/master/spring-boot-2-keycloak Regards, Aliaksei