@Override
protected void configure(HttpSecurity http) throws Exception {

    http
            // ... additional configuration ...
            .and()
                .rememberMe()
                .rememberMeServices(rememberMeServices())
           // ... additional configuration ...
}

@Bean
RememberMeServices rememberMeServices() {
    SpringSessionRememberMeServices rememberMeServices = new SpringSessionRememberMeServices();
    rememberMeServices.setAlwaysRemember(true);
    return rememberMeServices;
}