This property is marked as @Transient and therefore must have an initializing expression

seems like this is no longer valid?

@Transient
lateinit var rootDir: File

this seems to only be a error on 1.3.50, worked fine on 1.3.41

if it's not nullable or has a default value, what would you expect it to be after deserialization? Can't be null, it's a non-nullable value.

lateinit

doesn't make sense because it's in an undefined state after deserialization, it's never initialized. There's no way for the deserializer to infer a default value for every possible type, so the only reasonable solution is to require the developer to provide it

well exactly why it is lateinit, i set it manually, i guess i might have to only use nullables from now on

lateinit

is designed for something you know is going to be set. If you can't reasonably expect a property to actually be set during some initialization process, you should probably keep it nullable. Keep in mind that

lateinit

does not mean "null until set", as would be the case for such variables in Java; it's a much stronger contract than that

well it worked in 1.3.41 with older serialization, this seems like a oversight that maybe was never tested and .. thats exactly how i am using it.. it is set first thing after the deserialization and it would blow up horribly without that being initialized

basically

lateinit

is for dependency injection into property (into constructor works obviously without it)