I noticed what might be a potential Kotlin bug. I...

# gradle

[Carter]

I noticed what might be a potential Kotlin bug. I’m building a list of file paths for a Gradle task, and it blows up when configuration cache is enabled while using buildList with this error.

Could not load the value of field `collection` of `kotlin.collections.builders.SerializedCollection` bean found in input property `$1` of task

Using mutableList<String>().apply {...} or buildList{...}.toList() is a workaround. Based on the error message, it sounds like buildList yields a non-serializable list while mutableList yields a serializable list.

I’m reproduced using Gradle 8.2.1 and Kotlin 1.9.0 with config cache enabled. (I know Gradle 8.2.1 is using Kotlin 1.8.20 for build scripts, but Kotlin 1.9.0 enabled me to turn config cache on.)

[ephemient]

https://youtrack.jetbrains.com/issue/KT-39328/Make-builder-collection-implementations-serializable they're supposed to be serializable… what version?

[ephemient]

oh I see you mentioned Gradle 8.2.1 and Kotlin 1.9.0. you're not using Kotlin 1.9.0 inside of a Gradle plugin, right? the embedded Kotlin version is 1.8.20 and anything else in buildscript classpath can cause issues

[Carter]

The Kotlin 1.9.0 gradle plugin is just visible so I can write convention plugins against it.

[ephemient]

ok, then a binary convention plugin or a script plugin?

[ephemient]

I'm not seeing an issue myself though

[Carter]

My reproduction case is in a private project, however this open source project is set up almost identically https://github.com/zcash/kotlin-bip39/tree/main/build-conventions-bip39 except for using an older version of Gradle and Kotlin.

[ephemient]

ah, writing script plugins that apply KGP is problematic