return null;
        }
        return TimeoutManager.getInstance().addTimeoutTarget(() -> {
            logger.warn("Process is terminated due to {} second exceeded.", timeout);
            ComponentUtil.getProcessHelper().destroyProcess(sessionId);
            processTimeout = true;
        }, timeout, false);
    }

    protected void createSystemProperties(final List<String> cmdList, final File propFile) {

        }
        resultBuf.append("Session Id: ").append(sessionId).append("\n");
        if (jobExecutor != null) {
            jobExecutor.addShutdownListener(() -> ComponentUtil.getProcessHelper().destroyProcess(sessionId));
        }

        final TimeoutTask timeoutTask = createTimeoutTask();
        try {
            executeThumbnailGenerator();
        } catch (final Exception e) {