An Authentication object was not found in the SecurityContext

When added @Push annotation to ui class and try to navigate another view i'm getting this error:

org.springframework.security.authentication.AuthenticationCredentialsNotFoundException: An Authentication object was not found in the SecurityContext

DiscoveryNavigator  securedNav = new DiscoveryNavigator(this, this);

Button click:

    DiscoveryNavigator dn = (DiscoveryNavigator) UI.getCurrent().getNavigator();
    dn.navigateTo((String) event.getButton().getData());

[maslovalex]

check this out, it helped me https://vaadin.com/forum#!/thread/3383122

thanks maslovalex. I solved with custom viewprovider and this one.
https://github.com/michael-simons/vaadin-springsecurityviewprovider.