code: public static void generate(ConfigurationImpl configuration) {
          PackageIndexWriter packgen;
          DocPath filename = DocPaths.OVERVIEW_SUMMARY;
          try {
              packgen = new PackageIndexWriter(configuration, filename);
              packgen.buildPackageIndexFile("doclet.Window_Overview_Summary", true);
              packgen.close();
          } catch (IOException exc) {
              configuration.standardmessage.error(
                          "doclet.exception_encountered",
                          exc.toString(), filename);
              throw new DocletAbortException(exc);
          }
      }
docs: Generate the package index page for the right-hand frame.
  
  @param configuration the current configuration of the doclet.