}

    public File createTempFile(final String prefix, final String suffix) {
        try {
            final File file = File.createTempFile(prefix, suffix);
            if (logger.isDebugEnabled()) {
                logger.debug("Create {} as a temp file.", file.getAbsolutePath());
            }
            return file;
        } catch (final IOException e) {

    private OptionalEntity<File> getTargetFile(final String fileName) {
        final File baseDir = new File(getServletContext().getRealPath("/"));
        final File targetFile = new File(getServletContext().getRealPath(fileName));
        final List<File> fileList = getAccessibleFileList(baseDir);
        for (final File file : fileList) {
            if (targetFile.equals(file)) {

        verifyTokenKeep(() -> downloadpage(form.dictId));
        return charMappingService.getCharMappingFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                })).orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadMappingFile(GLOBAL),

                webAuthenticationService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }

            return true;
        });
    }

    public boolean update(final String id, final String field, final Object value) {
        return ComponentUtil.getSearchEngineClient().update(ComponentUtil.getFessConfig().getIndexDocumentUpdateIndex(), id, field, value);
    }

    public boolean update(final String id, final Consumer<UpdateRequestBuilder> builderLambda) {
        try {

                } catch (final Exception e) {
                    logger.warn("Failed to read a click log: {}", list, e);
                }
            }
        } catch (final IOException e) {
            logger.warn("Failed to read a click log.", e);
        }
    }

    public void exportCsv(final Writer writer) {

            try {
                userService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to add {}", entity, e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }

        } catch (final Exception e) {
            logger.warn("Failed to store crawling information.", e);
        }

        try {
            return crawler.doCrawl(options);
        } finally {
            try {
                crawlingInfoHelper.store(options.sessionId, false);
            } catch (final Exception e) {
                logger.warn("Failed to store crawling information.", e);
            }

        verifyTokenKeep(() -> downloadpage(form.dictId));
        return stopwordsService.getStopwordsFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                })).orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadStopwordsFile(GLOBAL),

                    putResultDataBody(dataMap, fessConfig.getIndexFieldHasCache(), Constants.TRUE);
                } catch (final Exception e) {
                    logger.warn("Failed to write a cache: {}:{}", sessionId, responseData, e);
                }
            } else {
                logger.debug("Content size is too large({} > {}): {}", responseData.getContentLength(),