I m getting when applying the Kotlin Multiplatform plugin as well as the Android library plugin ```Could not create an instance of type org jetbrains kotlin gradle plugin mpp KotlinAndroidTarget gt Could not generate a decorated class for type KotlinAndroidTarget gt com android build gradle api BaseVariant``` The error message doesn t help me at all where should I look for to fix this

Could not create an instance of type org.jetbrains.kotlin.gradle.plugin.mpp.KotlinAndroidTarget.
> Could not generate a decorated class for type KotlinAndroidTarget.
   > com/android/build/gradle/api/BaseVariant

The error message doesn't help me at all, where should I look for to fix this?

mbonnin

03/16/2023, 8:14 PM

There should be more to it like causes and so on if you run with --stacktrace

Usually it's a NoSuchMethod exception because some wrong dependency was put in your classloader

CLOVIS

03/16/2023, 8:16 PM

org.gradle.api.reflect.ObjectInstantiationException: Could not create an instance of type org.jetbrains.kotlin.gradle.plugin.mpp.KotlinAndroidTarget.
Caused by: org.gradle.internal.instantiation.ClassGenerationException: Could not generate a decorated class for type KotlinAndroidTarget.
Caused by: java.lang.NoClassDefFoundError: com/android/build/gradle/api/BaseVariant
Caused by: java.lang.ClassNotFoundException: com.android.build.gradle.api.BaseVariant

It seems you're right, how can I find out why it's behaving this way?

mbonnin

03/16/2023, 8:16 PM

Mmm looks more like no AGP is loaded in your classpath

Did you apply the android plugin?

CLOVIS

03/16/2023, 8:17 PM

com.android.library

, yes

mbonnin

03/16/2023, 8:17 PM

Interesting... Maybe it's not loaded in the same classpath as your Kotlin plugin

Make sure to put them one next to the other

If you're applying AGP in the root build.gradle.kts, put KGP next

Same if your in buildSrc, or buildscript {}

CLOVIS

03/16/2023, 8:19 PM

I tried Kotlin-then-AGP, and the opposite, same thing It's a regular project, not the root project nor buildSrc, I am referring to both plugins using a version catalog though

mbonnin

03/16/2023, 8:19 PM

Note that by applying, I mean "load the jar" so

plugins {
  id("com.android.application").version(foo).apply(false)
}

is also loading the jar

Apply AGP first ?

Maybe it's a simple ordering issue

CLOVIS

03/16/2023, 8:20 PM

Doesn't seem to change anything

Ah, I added the plugin with apply(false) to the root project and now it's fine

mbonnin

03/16/2023, 8:24 PM

Welcome to classloader hell

CLOVIS

03/16/2023, 8:25 PM

🎉

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