Litho: @PropDefault problem on kotlin 1.4.10

[TimurKhairnasov]

• [ ] I have searched existing issues and this is not a duplicate

Version

0.38.0

Issues and Steps to Reproduce

After upgrate kotlin to 1.4.10 can't build project because of the problem below:

it goes from @PropDefault value. Removing it solves the problem, but I'd like to use it)

@colriot take a look, please)

[colriot]

Hi @TimurKhairnasov ! Yep, seems that it's happening due to the new synthetics methods generation behaviour: https://kotlinlang.org/docs/reference/compatibility-guide-14.html#kapt-names-of-synthetic-annotations-methods-for-properties-have-changed

To mitigate this you can mark @PropfDefault fields as @JvmField, it will fix the compilation

[TimurKhairnasov]

@colriot, compilation has fixed, but default values are not setting up. Int value is 0, despite of PropDefault value.

• for VerticalGravity value error: Parameter specified as non-null is null
  

[tpucci]

I have the same issue 😕 , @TimurKhairnasov have you found a workaround?

[tpucci]

Ok, I have found a workaround, after seeing this:

https://github.com/facebook/litho/blob/bad7023f2668882a9d01525676d8ef868ce06f09/litho-processor/src/main/java/com/facebook/litho/specmodels/processor/PropDefaultsExtractor.java#L111

Change all @PropDefaut with @get:PropDefault and it should work.

I checked generated Component and they look the same before (kotlin 1.3.72 and @PropDefaut) and after (kotlin 1.4.10 and @get:PropDefaut).

(thanks @tychota for pointing me in the right direction) 🥳

[pavlospt]

Well hello there 😄 I remember the days I was fixing this 😂 @colriot should I give it a try and port it to the new behavior?

[TimurKhairnasov]

@tpucci helped me too, thanks!