}

        File uploadFile;
        // normalize filename
        if (checkFileType(fileName, fessConfig.getSupportedUploadedMediaExtentionsAsArray())
                && checkFileType(uploadedFileName, fessConfig.getSupportedUploadedMediaExtentionsAsArray())) {
            uploadFile = new File(getServletContext().getRealPath("/images/" + fileName));

                .get(stream -> stream.filter(StringUtil::isNotBlank).toArray(n -> new String[n]));
    }

    String getSupportedUploadedMediaExtentions();

    default String[] getSupportedUploadedMediaExtentionsAsArray() {
        return split(getSupportedUploadedMediaExtentions(), ",")
                .get(stream -> stream.filter(StringUtil::isNotBlank).toArray(n -> new String[n]));
    }