code: public boolean isViewMapped(String viewId)
     {
        if (viewId != null)
        {
           viewId = viewId.trim();
           for (UrlMapping mapping : mappings)
           {
              if (viewId.equals(mapping.getViewId())
                       || (viewId.startsWith("/") && viewId.substring(1).equals(mapping.getViewId())))
              {
                 return true;
              }
           }
        }
        return false;
     }
docs: Discover if the given ViewId is mapped by any {@link UrlMapping} specified in the current configuration.
  <p>
  <b>Note:</b>This will not match if a #{dynamicView.id} method is configured.
  
  @return True if the ViewId is mapped, false if not.