public static String tmpJournal(){
  final File file=Code.wrapThrow(null);
  file.deleteOnExit();
  return file.getAbsolutePath();
}

public static String tmpJournal ( ) { final File file = Code . wrapThrow ( null ) ; file . deleteOnExit ( ) ; return file . getAbsolutePath ( ) ; }
create a tmp journal file for test cases .
