code: public static void chmod( final File file, final int mode, final Logger logger )
          throws ArchiverException
      {
          chmod( file, mode, logger, Boolean.getBoolean( "useJvmChmod" ) && jvmFilePermAvailable );
      }
docs: <b>jvm chmod will be used only if System property <code>useJvmChmod</code> set to true</b>
  
  @param file
  @param mode
  @param logger
  @throws ArchiverException