Vaadin Spring Boot View - Hangs on action execution without loading indicat

Hi guys,
I’ve a trouble with a spring-boot vaadin integration.
I’ve created a lot of vaadin views and a vaadin navigator using SpringViewProvider to manage views.
in this way i don’t manage views creation directly calling constructor, so i can @Autowire a jpa service in view and do some stuff.
When i execute an action on view , calling the service , the view does not show a loading indicator gif or bar on upper side of the browser, so it seems that the view hangs for seconds.
How can i resolve this ?
ps : forgive me for my english :slight_smile: