void (GeneralCommandLine commandLine, int priority) { if (priority < -20 || priority > 19) { throw new IllegalArgumentException("priority must be greater or equal to -20 and less than 20: " + priority); } String executablePath = commandLine.getExePath(); commandLine.setExePath("nice"); commandLine.getParametersList().prependAll("-n", Integer.toString(priority), executablePath); }