@Override
    public ResultData transform(final ResponseData responseData) {
        if (responseData == null || !responseData.hasResponseBody()) {
            final String url = responseData != null ? responseData.getUrl() : "unknown";
            throw new CrawlingAccessException("No response body for URL: " + url + ". Cannot transform empty response.");
        }

        final ResultData resultData = new ResultData();

        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(2, urlList.size());
        assertEquals("http://www.example.com", urlList.get(0).getUrl());
        assertEquals("http://www.test.com", urlList.get(1).getUrl());

        urlList.clear();
        urlList.add(RequestDataBuilder.newRequestData().get().url("feed://www.example.com").build());

        final ResponseData responseData = new ResponseData();

        responseData.setUrl("http://example.com/document.pdf");
        assertEquals("http://example.com/document.pdf", responseData.getUrl());

        responseData.setMimeType("application/pdf");
        assertEquals("application/pdf", responseData.getMimeType());

        responseData.setCharSet("UTF-8");

        this.url = url;
        this.abort = abort;
    }

    /**
     * Gets the URL where the crawling error occurred.
     *
     * @return the URL associated with this exception
     */
    public String getUrl() {
        return url;
    }

    /**
     * Checks whether the crawling process should be aborted due to this exception.
     *
     * @return true if the crawling should be aborted, false otherwise
     */

                                && (attributes.get("Fess-WebAppJar") != null || attributes.getValue("Fess-WebAppJar") != null)) {
                            createWebResourceSet(ResourceSetType.CLASSES_JAR, "/WEB-INF/classes", possibleJar.getURL(), "/");
                        }
                    }
                } catch (final Exception e) {
                    logger.log(Level.WARNING, e, () -> {

                throw new FessSystemException("Could not find tikaExtractor.");
            }
        }

        if (logger.isDebugEnabled()) {
            logger.debug("url={}, extractor={}", responseData.getUrl(), extractor);
        }
        return extractor;
    }

        return convertEmptyToNull(queryId);
    }

    public void setQueryId(String value) {
        registerModifiedProperty("queryId");
        this.queryId = value;
    }

    public String getUrl() {
        checkSpecifiedProperty("url");
        return convertEmptyToNull(url);
    }

    public void setUrl(String value) {
        registerModifiedProperty("url");
        this.url = value;
    }

        return convertEmptyToNull(threadName);
    }

    public void setThreadName(String value) {
        registerModifiedProperty("threadName");
        this.threadName = value;
    }

    public String getUrl() {
        checkSpecifiedProperty("url");
        return convertEmptyToNull(url);
    }

    public void setUrl(String value) {
        registerModifiedProperty("url");
        this.url = value;
    }

        }
        final Extractor extractor = extractorFactory.getExtractor(responseData.getMimeType());
        if (logger.isDebugEnabled()) {
            logger.debug("url={}, extractor={}", responseData.getUrl(), extractor);
        }
        return extractor;
    }

        return requestedAt;
    }

    public void setRequestedAt(LocalDateTime value) {
        registerModifiedProperty("requestedAt");
        this.requestedAt = value;
    }

    public String getUrl() {
        checkSpecifiedProperty("url");
        return convertEmptyToNull(url);
    }

    public void setUrl(String value) {
        registerModifiedProperty("url");
        this.url = value;
    }