return thumbnailUri.toString();
                    }
                }
            }

            final XPathNodes imgNodeList = getXPathAPI().selectNodeList(document, fessConfig.getThumbnailHtmlImageXpath());
            String firstThumbnailUrl = null;
            for (int i = 0; i < imgNodeList.size(); i++) {
                final Node imgNode = imgNodeList.get(i);
                if (logger.isDebugEnabled()) {