//init()
setErrorHandler(new LogErrorListener(this));

public class LogErrorListener implements Terminal.ErrorListener{

    private static Logger logger = Logger.getLogger(LogErrorListener.class);

    private ExApp2 application;
  
    public LogErrorListener(ExApp2 application) {
        this.application = application;
    }


    public void terminalError(Terminal.ErrorEvent event) {
        Throwable e = event.getThrowable();

        StringWriter st = new StringWriter();
        e.printStackTrace(new PrintWriter(st));

        StringBuilder sb = new StringBuilder();
        sb.append("<pre>");
        sb.append(st.toString());
        sb.append("</pre>");
        Window window = application.getWindows().iterator().next();
        DateFormat format = DateFormat.getTimeInstance();
        String msg = format.format(new Date()) + " :Ошибка: "+sb.toString();
        window.showNotification(msg, Window.Notification.TYPE_ERROR_MESSAGE); //вывел посмотреть

        logger.error(msg);
    }
  
}