code: public static void extractFiles(File archive, File extractTo) throws ExtractionException {
          extractFiles(archive, extractTo, null);
      }
docs: Extracts the contents of an archive into the specified directory.
  
  @param archive an archive file such as a WAR or EAR
  @param extractTo a directory to extract the contents to
  @throws ExtractionException thrown if an exception occurs while
  extracting the files