code: private String src()
      {
  
          // Deal with a direct context-relative page that has been specified
          if (_page != null) {
              HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
              ModuleConfig config = (ModuleConfig) request.getAttribute(Globals.MODULE_KEY);
              if (config == null)
                  return (request.getContextPath() + _page);
              return (request.getContextPath() + config.getPrefix() + _page);
          }
  
          // Deal with an absolute source that has been specified
          if (_state.src != null)
              return _state.src;
          return null;
      }
docs: Return the base source URL that will be rendered in the <code>src</code>
  property for this generated element, or <code>null</code> if there is
  no such URL.