Kotlin metadata error with Kotlin 1.5.0-M2

[vRallev]

Using Kotlin preview builds like 1.5.0-M2 results in following error:

Caused by: java.lang.IllegalStateException: Could not parse metadata! This should only happen if you're using Kotlin <1.1.
        at com.squareup.moshi.kotlinpoet.metadata.KotlinPoetMetadata.readKotlinClassMetadata(KotlinPoetMetadata.kt:70)
        at com.squareup.moshi.kotlinpoet.metadata.KotlinPoetMetadata.toImmutableKmClass(KotlinPoetMetadata.kt:50)
        at com.squareup.moshi.kotlin.codegen.MoshiCachedClassInspector.toImmutableKmClass(MoshiCachedClassInspector.kt:22)
        at com.squareup.moshi.kotlin.codegen.MetadataKt.targetType(metadata.kt:109)
        at com.squareup.moshi.kotlin.codegen.JsonClassCodegenProcessor.adapterGenerator(JsonClassCodegenProcessor.kt:136)
        at com.squareup.moshi.kotlin.codegen.JsonClassCodegenProcessor.process(JsonClassCodegenProcessor.kt:110)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.process(incrementalProcessors.kt:90)
        at org.jetbrains.kotlin.kapt3.base.ProcessorWrapper.process(annotationProcessing.kt:175)
        at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:980)
        ... 41 more

There's no special sample required, it happens with any Kotlin file. This issue doesn't happen with version 1.5.0-M1.

[ZacSweers]

This is probably due to kotlinx-metadata needing a newer version. They have a 0.2.0 planned but not released yet

[vRallev]

This became an issue in 1.5.0-M2.

[vRallev]

Seems like 0.2.0 was released a while ago: https://search.maven.org/artifact/org.jetbrains.kotlinx/kotlinx-metadata-jvm/0.2.0/jar

[ZacSweers]

Yup I was thinking of 0.2.1 not 0.2.0

[gajicm93]

This seems to be happening again with Kotlin 1.5.30?

[bmarty]

This seems to be happening again with Kotlin 1.6.0

[ZacSweers]

Known issue, it will be updated in the next release (waiting for KSP to release)

[niqo01]

Which KSP issue is this waiting on?

[antonshkurenko]

I haven't found another issue (about 1.6.0), so maybe it's better to re-open this

[AlexZvonik]

The issue is reproducible with moshi 1.12.0 and kotlin 1.6.0