good morning :slightly_smiling_face: just discover...

# arrow-meta

[Tiago]

good morning 🙂
just discovered Arrow Analysis and it sounds amazing
do I really need to use org.jetbrains.kotlin.multiplatform or org.jetbrains.kotlin.jvm is good enough?

I am getting a weird error trying to set it up: java.lang.NoClassDefFoundError:

org/jetbrains/kotlin/resolve/jvm/extensions/AnalysisHandlerExtension$DefaultImpls
	at arrow.meta.internal.registry.InternalRegistry$registerPostAnalysisContextEnrichment$1$1.analysisCompleted(InternalRegistry.kt:123)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:115)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:125)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:99)
.....
* What went wrong:
Execution failed for task ':project:compileKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Internal compiler error. See log for more details

[raulraja]

Hi Tiago, what version of the Kotlin compiler are you using? We have pending updating Arrow Analysis to the new K2 compiler frontend. Also heads up Arrow Analysis is highlyexperimental :)

[Tiago]

hey Raul, thanks for your quick reply
Yeah, want to try it on a personal project 🙂
I am using the 1.8.10 kotlin version

[raulraja]

Arrow Analysis is currently coupled to 1.6.21 https://github.com/arrow-kt/arrow-analysis/blob/main/gradle/projects.libs.versions.toml#L9

[raulraja]

We need to update it to FIR to 1.8.20-Beta at least, but that requires an entire rewrite of the tree interfaces which are currently mapped to the old kotlin frontend.

[raulraja]

I'd probably have to do that unless someone picks it up and I'm currently swamped with work at least until the summer. But I plan to start adapting the tree to FIR when 1.9/2.0 comes stable.

[Tiago]

weird… I created a new project using the 1.8.20-Beta and it worked, the problem was my old project 😅

[Tiago]

but anyway, I wonder if I could contribute a little with this

[raulraja]

it may work in some cases but since the Kotlin compiler makes no guarantees of its public api changing in some others it may fail

[raulraja]

we don't restrict it

[Tiago]

got it

[Tiago]

well, I will try to compile this project and see if I can give any help for it

[Tiago]

thanks Raul

[raulraja]

thanks, not sure if there is any easy task there at the moment but if you find anything I'll be happy to meet up and help you through any questions