Please be advised that we discourage the use of the honorific 'ji'.
Servlets act as the first point of contact for requests to the container, or atleast the first contact that can be used by developers. (Filters can now access requests before this, but they are designed for different purposes). Even JSPs and static content can be configured through Servlets.
So, even if you only had static content, the content would be served through a Servlet. Even if you only used JSPs, they would be accessed through a Servlet.
Likewise, Struts needs a 'bootstrap' servlet to hook it into the container so that the container can manage the requests to Struts. Even if you don't write the Servlet, they are still there.