I wrote my own custom error handler for the UI in Vaadin flow. But when I throw the exception my view crash and not show my human readable error message.
I did this in other application using Vaadin 8 and works perfectly. The idea its throw a SgiException in my backend services like:
- Product not found
- Incorrect value for field "XXX"
- Not available stock for the product.
- etc.
And then show a system notification
public static void setDefaultErrorHandler(ErrorEvent errorEvent) {
Throwable t = DefaultErrorHandler.findRelevantThrowable(errorEvent.getThrowable());
String message;
if (t != null) {
message = t.getMessage();
} else {
message = "";
}
log.error(message, t);
SgiException sgiException = getCauseOfType(t, SgiException.class);
if (sgiException != null) {
NotificationBuilder.exception(sgiException.getCode(), sgiException.getMessage());
return;
} else {
NotificationBuilder.exception(UNKNOW_ERROR, (message == null ? "" : message));
return;
}
}
private static <T extends Throwable> T getCauseOfType(Throwable th, Class<T> type) {
while (th != null) {
if (type.isAssignableFrom(th.getClass())) {
return (T) th;
} else {
th = th.getCause();
}
}
return null;
}
And this is how I set the custom error handler:
@PostConstruct
public void configBaseView() {
VaadinSession.getCurrent().setErrorHandler(Util::setDefaultErrorHandler);
}
In the view show this:
Note: Debugging the application, seeing the code it's running, looks the method its called for some reason not show the notification.
