if (StringUtil.isBlank(filename)) {
            throw new JobProcessingException("Python script is not specified.");
        }

        cmdList.add(fessConfig.getPythonCommandPath());

        cmdList.add(getPyFilePath());

        cmdList.addAll(argList);

        try {

            final File baseDir = new File(servletContext.getRealPath("/WEB-INF")).getParentFile();

        }

        cmdList.add(Crawler.class.getCanonicalName());

        cmdList.add("--sessionId");
        cmdList.add(sessionId);
        cmdList.add("--name");
        cmdList.add(namespace);

        if (webConfigIds != null && webConfigIds.length > 0) {
            cmdList.add("-w");
            cmdList.add(StringUtils.join(webConfigIds, ','));

            jvmOptions.stream().filter(StringUtil::isNotBlank).forEach(cmdList::add);
        }

        cmdList.add(ThumbnailGenerator.class.getCanonicalName());

        cmdList.add("--sessionId");
        cmdList.add(sessionId);
        cmdList.add("--numOfThreads");
        cmdList.add(Integer.toString(numOfThreads));
        if (cleanup) {
            cmdList.add("--cleanup");
        }

        }
    }

    public JobProcess startProcess(final String sessionId, final List<String> cmdList, final Consumer<ProcessBuilder> pbCall) {
        return startProcess(sessionId, cmdList, pbCall, InputStreamThread.MAX_BUFFER_SIZE, null);
    }

    public synchronized JobProcess startProcess(final String sessionId, final List<String> cmdList, final Consumer<ProcessBuilder> pbCall,

        addFessSystemProperties(cmdList);
        addSystemProperty(cmdList, Constants.FESS_CONF_PATH, null, null);
        cmdList.add("-Dfess." + getExecuteType() + ".process=true");
        if (logFilePath == null) {
            final String value = System.getProperty("fess.log.path");
            logFilePath = value != null ? value : new File(targetDir, "logs").getAbsolutePath();
        }

            if (appendValue != null) {
                buf.append(appendValue);
            }
            cmdList.add(buf.toString());
        } else if (defaultValue != null) {
            cmdList.add("-D" + name + "=" + defaultValue);
        }
    }

    protected void addFessConfigProperties(final List<String> cmdList) {

                final List<String> cmdList = new ArrayList<>();
                for (final String value : commandList) {
                    cmdList.add(expandPath(value.replace("${url}", tempPath).replace("${outputFile}", outputPath)));
                }

                executeCommand(thumbnailId, cmdList);

                if (outputFile.isFile() && outputFile.length() == 0) {