private Button getArtifactDownloadButton(final Table table, final Object itemId) {
    final String fileName = (String) table.getContainerDataSource().getItem(itemId)
            .getItemProperty(PROVIDED_FILE_NAME).getValue();
    final Button downloadIcon = SPUIComponentProvider.getButton(
            fileName + "-" + UIComponentIdProvider.ARTIFACT_FILE_DOWNLOAD_ICON, "",
            i18n.getMessage(UIMessageIdProvider.TOOLTIP_ARTIFACT_DOWNLOAD), ValoTheme.BUTTON_TINY + " " + "blueicon", 
            true, FontAwesome.DOWNLOAD, SPUIButtonStyleNoBorder.class);
    downloadIcon.setData(itemId);
    FileDownloader fileDownloader = new FileDownloader(createStreamResource((Long) itemId));
    fileDownloader.extend(downloadIcon);
    fileDownloader.setErrorHandler(new ErrorHandler() {

        /**
         * Error handler for file downloader
         */
        private static final long serialVersionUID = 4030230501114422570L;

        @Override
        public void error(com.vaadin.server.ErrorEvent event) {
            uINotification.displayValidationError(i18n.getMessage(UIMessageIdProvider.ARTIFACT_DOWNLOAD_FAILURE_MSG));
        }
    });
    return downloadIcon;
}
 

/**
 * Call the session's {@link ErrorHandler}, if it has one, with the given
 * exception wrapped in an {@link ErrorEvent}.
 */
private void callErrorHandler(VaadinSession session, Exception e) {
    try {
        ErrorHandler errorHandler = ErrorEvent.findErrorHandler(session);
        if (errorHandler != null) {
            errorHandler.error(new ErrorEvent(e));
        }
    } catch (Exception ex) {
        // Let's not allow error handling to cause trouble; log fails
        logger.warn("ErrorHandler call failed", ex);
    }
}