Unable to use Keycloak in Spring Boot 2.1 due to duplicated Bean Registration httpSessionManager

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This helped me to resolve an issue, remove @KeycloakConfiguration and use this instead (from KEYCLOAK-8725):

Java:

@Configuration
@ComponentScan(
        basePackageClasses = KeycloakSecurityComponents.class,
        excludeFilters = @ComponentScan.Filter(type = FilterType.REGEX, pattern = "org.keycloak.adapters.springsecurity.management.HttpSessionManager"))
@EnableWebSecurity

Kotlin:

@Configuration
@ComponentScan(
    basePackageClasses = [KeycloakSecurityComponents::class],
    excludeFilters = [ComponentScan.Filter(type = FilterType.REGEX, pattern = ["org.keycloak.adapters.springsecurity.management.HttpSessionManager"])]
)
@EnableWebSecurity

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