How do I render a Spring View from a String representing JSP?

I'm just diving into Spring MVC, and am trying to render a view from a String containing JSP as opposed to a JSP File.

For example:

public ModelAndView execute() {
    String contentToRender = "
       <p>Counting to three:</p>
       <% for (int i=1; i<4; i++) { %>
       <p>This number is <%= i %>.</p>
       <% } %>
      <p>OK.</p>
    ";
    ModelAndView view = new ModelAndView (contentToRender);
    return view;
}

Which doesn't work.

How can I render this to the page from a controller?