LiveData query subscription swallows query exceptions

[tvvbbb]

When I use arch(LiveData), I found no exception trigged with no empty constructor. But build a query and invoke find() will trigger the exception.

[greenrobot]

@tvvbbb Could you please post the exception stack trace? Thank you!

[tvvbbb]

If I use LiveData, it is no exception. So I can't realize no empty constructor is wrong. But if I only use query().find(), it will make the exception.

[greenrobot-team]

If I understand this correctly, the issue is that a DataSubscription used by ObjectBoxLiveData might swallow exceptions that occured while running a query.

There is a note in SubscriptionBuilder.ActionObserver.callOnError() (link might stop working with new releases, as I can not link to a tagged version) about this. It was added with 882a204.

There is SubscriptionBuilder.onError() to explicitly set an error observer. Maybe we can implement it and throw the exception there?
-ut

[greenrobot-team]

Could confirm this using the arch example project (added a ToOne relation to Note, made fields private).

Upon further investigation it turns out QueryPublisher.publishSingle() swallows any exceptions from query.find().
-ut

[tvvbbb]

I am so sorry for my poor English. I am not sure to get what you mean actually. https://github.com/tvvbbb/ObjectBoxLiveDataSwallowsException. Comment in MainActivity.

[tvvbbb]

I am sorry for my wrong operation, repository commit failed. Now is successful.

[greenrobot-team]

@tvvbbb OK, so I understood correctly (for me: see my previous comment). Thanks! -ut

[tvvbbb]

Is it a bug?