<Kotlin 1.4.20 Released> Kotlin 1.4.20 is here with new experimental features for you to try. Being ...

# announcements

[user]

Kotlin 1.4.20 Released
Kotlin 1.4.20 is here with new experimental features for you to try. Being open to community feedback is one of the Kotlin team’s basic principles, and we need your thoughts about the prototypes of the new features. Give them a try and share your feedback on Slack (get an invite here) or YouTrack. Here are […]

[aleksey.tomin]

I have warnings on my multimodule project:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.intellij.util.ReflectionUtil (file:/Users/atomin/.konan/kotlin-native-prebuilt-macos-1.4.20/konan/lib/kotlin-native.jar) to method java.util.ResourceBundle.setParent(java.util.ResourceBundle)
WARNING: Please consider reporting this to the maintainers of com.intellij.util.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

[Alexey Belkov [JB]]

Looks like https://youtrack.jetbrains.com/issue/KT-43520, please watch the issue for updates

[hoang]

my project stops compilable after upgrading to 1.4.20 with a bunch of Kotlin: Type mismatch: inferred type is Optional<T!!> but Optional<T> was expected, is there a way to install older version of kotlin/kotlin-idea-plugin (1.4.10 works fine)?

[gildor]

Yes, you can uninstall Kotlin plugin and install it manually (drag and drop.kotlin plugin zip, you can download it from Idea marketplace website)

[hoang]

Thank you.