code: protected void initDefinitionsMapping() throws ServletException
      {
          definitionsFactory = null;
          TilesUtilImpl tilesUtil = TilesUtil.getTilesUtil();
  
          if ( tilesUtil instanceof TilesUtilStrutsImpl )
          {
              // Retrieve and set factory for this modules
              definitionsFactory =
                      ( ( TilesUtilStrutsImpl ) tilesUtil ).getDefinitionsFactory( getServletContext(), moduleConfig );
  
              if ( definitionsFactory == null && log.isDebugEnabled() )
              {
                  log.debug( "Definition Factory not found for module: '"
                             + moduleConfig.getPrefix() );
              }
          }
      }
docs: Read component instance mapping configuration file.
  This is where we read files properties.