Hi, From a custom gradle plugin, I’m reacting to t...

# gradle

[Justin Tullgren]

Hi, From a custom gradle plugin, I’m reacting to the kotlin plugin being applied, pluginManager.withPlugin("org.jetbrains.kotlin.jvm") and trying to configure the the KotlinCompile task tasks.withType<KotlinCompile>().configureEach. however, gradle says the class can’t be found. This is a JVM project. Any idea why?

[mbonnin]

Can you share the stacktrace? What class can't be found?

[mbonnin]

This sounds like you have different KotlinCompile classes in your classpath but it's hard to tell. Maybe double check you have KGP as a compileOnly dependency of your plugin?

[Justin Tullgren]

stack

stack

[Justin Tullgren]

convention plugin.cpp

convention plugin.cpp

[Justin Tullgren]

convention plugin build.gradle.kt

convention plugin build.gradle.kt

[Justin Tullgren]

running with debug gives this in the error

Caused by: java.lang.IllegalArgumentException: No enum constant org.jetbrains.kotlin.statistics.metrics.StringMetrics.USE_CLASSPATH_SNAPSHOT

[mbonnin]

Sounds like disconnects between the KGP version your plugin is expecting and the one that is applied in your project

[Justin Tullgren]

i’m using gradle version catalogs

[Justin Tullgren]

unless gradle is bringing something in i don’t see how

[mbonnin]

Make sure libs.kotlinGradlePlugin and the plugin alias you have for KGP point to the same version

[Justin Tullgren]

yes

[Justin Tullgren]

they do

[mbonnin]

NoClassDefFoundError and ClassNotFoundexception are different. I'm assuming you got ``ClassNotFoundexception`` in debug, right?

[mbonnin]

Usually that's because you have a new Gradle daemon. The first time the JVM chokes on a class, it'll throw ClassNotFoundexception and after that, it "remembers" and throws NoClassDefFoundError

[Justin Tullgren]

the stack is NoClassDefFoundError

[Justin Tullgren]

hmm

[Justin Tullgren]

i’ll kill daemons and try not to use a daemon

[mbonnin]

Can you try ./gradlew stop && ./gradlew build ?

[Justin Tullgren]

sure

[Justin Tullgren]

there is no stop task in the project

[mbonnin]

woops, sorry ./gradlew --stop

[Justin Tullgren]

lol just saw that, no worries, trying again

[mbonnin]

USE_CLASSPATH_SNAPSHOT was added here. Looks like it's new in 1.9.0 or so, maybe 1.8.20-something

[Justin Tullgren]

ya i am on 1.8.20

[mbonnin]

The full stacktrace that leads to org.jetbrains.kotlin.statistics.metrics.StringMetrics.USE_CLASSPATH_SNAPSHOT would be interesting.
Something else you can try is ./gradlew buildEnvironment in your project where KGP and your convention plugin are applied and see if any odd version of KGP is there

[Justin Tullgren]

stack leading to USE_CLASSPATH_SNAPSHOT

stack leading to USE_CLASSPATH_SNAPSHOT

[Justin Tullgren]

./gradlew buildEnvironment fails before the report

[mbonnin]

Never easy, right? 😅

[mbonnin]

You could comment your convention plugin until it passes but not the most fun stuff to do...

[mbonnin]

This seems semi-related: https://youtrack.jetbrains.com/issue/KT-57371/Support-versions-for-StatsService

[Justin Tullgren]

ok no worries. thanks for your help!

[mbonnin]

Do you have maybe a "newer" gradle property that somehow the "older" build service does not know?

[mbonnin]

Or configuration cache maybe?

[Justin Tullgren]

i just commented out a settings plugin Plugin<Settings> in my settings.gradle.kts and that let it pass…. i was just applying common dependency repos

[Justin Tullgren]

i’ll dig into what its doing

[Justin Tullgren]

thanks for pointing me somewhere

[solonovamax]

if you do

tasks.withType<KotlinCompile>().configureEach { }

then so long as KotlinCompile is on the classpath, it should work (it will apply the configuration to tasks added afterwards)