How to integrate validationexception from entitylistener in GUI

Support
,
#1

I have a entity listener for performing validation as described in Validation in Java applications – Jmix

When validation fails I throw a javax.validation.ValidationException, also tried with ConstraintViolationExceptoin.

I expected/hoped this exception to be picked up by the GUI and shown in a nice validation notification in the way it works for declarative validation.

image

instead I get a generic exception dialog image

How can I wire this in, preferably without having to implement commit event listeners in all the screens.

#3

bump

anyone?

#4

You can create an Exception Handler for the whole UI part as described in the documentation

Something like this.

Entity listener with validation in core module:

@Component("sessionplanner_SessionListener")
public class SessionEntityListener implements BeforeInsertEntityListener<Session> {

    @Override
    public void onBeforeInsert(Session entity, EntityManager entityManager) {
        if (entity.getStartDate().isBefore(LocalDateTime.now())) {
            throw new CustomValidationException("Cannot plan session!");
        }
    }
}

Exception handler in web module:


@Component(ValidationExeptionHandler.NAME)
public class ValidationExeptionHandler extends AbstractUiExceptionHandler {
    public static final String NAME = "sessionplanner_ValidationExeptionHandler";

    public ValidationExeptionHandler() {
        super(CustomValidationException.class.getName());
    }

    @Override
    protected void doHandle(String className, String message, @Nullable Throwable throwable, UiContext context) {
        context.getNotifications().create(Notifications.NotificationType.ERROR)
                .withCaption("Error")
                .withDescription(message)
                .show();
    }
}
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