} catch (final Exception e) {
            logger.error("Failed to write an image file: {}", fileName, e);
            throwValidationError(messages -> messages.addErrorsFailedToWriteDesignImageFile(GLOBAL), this::asListHtml);
        }
        return redirect(getClass());
    }

    private boolean checkFileType(final String fileName, final String[] exts) {
        if (fileName == null) {

     * message: Failed to upload an image file.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsFailedToWriteDesignImageFile(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_failed_to_write_design_image_file));
        return this;
    }

    /**