@Override
public boolean handle(ErrorEvent event, App app) {
    boolean handled = super.handle(event, app);

    if (handled && event.getThrowable() != null) {
        // Finds the original source of the error/exception
        AbstractComponent component = DefaultErrorHandler.findAbstractComponent(event);
        if (component != null) {
            component.markAsDirty();
        }

        if (component instanceof Component.Focusable) {
            ((Component.Focusable) component).focus();
        }
    }
    return handled;
}
 

@Override
protected void init(VaadinRequest request) {
    broadcastReceiverService = AppContextUtil.getSpringBean(BroadcastReceiverService.class);

    ServerConfiguration serverConfiguration = AppContextUtil.getSpringBean(ServerConfiguration.class);
    if (serverConfiguration.isPush()) {
        getPushConfiguration().setPushMode(PushMode.MANUAL);
    }

    UI.getCurrent().setErrorHandler(new DefaultErrorHandler() {
        private static final long serialVersionUID = 1L;

        @Override
        public void error(com.vaadin.server.ErrorEvent event) {
            Throwable e = event.getThrowable();
            handleException(request, e);
        }
    });

    setCurrentFragmentUrl(this.getPage().getUriFragment());
    setCurrentContext(new UserUIContext());
    postSetupApp(request);

    EventBusFactory.getInstance().register(new ShellErrorHandler());

    mainWindowContainer = new MainWindowContainer();
    this.setContent(mainWindowContainer);

    getPage().addPopStateListener((Page.PopStateListener) event -> enter(event.getPage().getUriFragment()));

    String userAgent = request.getHeader("user-agent");
    if (isInNotSupportedBrowserList(userAgent.toLowerCase())) {
        NotificationUtil.showWarningNotification(UserUIContext.getMessage(ErrorI18nEnum.BROWSER_OUT_UP_DATE));
    }
}
 

@Override
protected void init(VaadinRequest vaadinRequest) {
    HorizontalLayout commandBar = new HorizontalLayout();
    commandBar.setWidth("100%");
    commandBar.addComponents(issuePanel(), bulkIssuePanel(), redeemPanel());

    Grid summary = summaryGrid();

    HorizontalLayout statusBar = new HorizontalLayout();
    Label statusLabel = new Label("Status");
    statusBar.setDefaultComponentAlignment(Alignment.MIDDLE_RIGHT);
    statusBar.addComponent(statusLabel);
    statusBar.setWidth("100%");

    VerticalLayout layout = new VerticalLayout();
    layout.addComponents(commandBar, summary, statusBar);
    layout.setExpandRatio(summary, 1f);
    layout.setSizeFull();

    setContent(layout);

    UI.getCurrent().setErrorHandler(new DefaultErrorHandler() {
        @Override
        public void error(com.vaadin.server.ErrorEvent event) {
            Throwable cause = event.getThrowable();
            log.error("an error occured", cause);
            while(cause.getCause() != null) cause = cause.getCause();
            Notification.show("Error", cause.getMessage(), Notification.Type.ERROR_MESSAGE);
        }
    });

    setPollInterval(1000);
    int offset = Page.getCurrent().getWebBrowser().getTimezoneOffset();
    // offset is in milliseconds
         ZoneOffset instantOffset = ZoneOffset.ofTotalSeconds(offset/1000);
    StatusUpdater statusUpdater = new StatusUpdater(statusLabel, instantOffset);
    updaterThread = Executors.newScheduledThreadPool(1).scheduleAtFixedRate(statusUpdater, 1000,
                                                                 5000, TimeUnit.MILLISECONDS);
    setPollInterval(1000);
    getSession().getSession().setMaxInactiveInterval(30);
    addDetachListener((DetachListener) detachEvent -> {
         log.warn("Closing UI");
         updaterThread.cancel(true);

    });

}