code: public static Server getServer() throws InitializationException {
          if (server == null) {
              server =
                      RebuildServer.getRebuildInstance(new File(
                              Constants.FEDORA_HOME));
          }
          return server;
      }
docs: Gets the instance of the server appropriate for rebuilding. If no such
  instance has been initialized yet, initialize one.
  
  @return the server instance.
  @throws InitializationException
  if initialization fails.