Hello :wave: I'm occasionally hitting `ClassNotFou...

# gradle

[Dariusz Kuc]

Hello 👋
I'm occasionally hitting ClassNotFoundException during the build

Caused by: java.lang.ClassNotFoundException: kotlinx.coroutines.CoroutinesInternalError

Which generally implies some classpath issue. I'm using Gradle 6.8 with Kotlin 1.4.32 and coroutines 1.4.3. Wondering if anyone else encountered similar issue?

While looking at the dependency tree (https://scans.gradle.com/s/uvf7bsxzvgwso/dependencies?dependencies=kotlinx-coroutines-core&expandAll) the only config on kotlinx-coroutines-core is from the kotlinCompilerPluginClasspath. When I run gradle -q dependencies --configuration kotlinCompilerPluginClasspath you can see that it comes from kotlin-scripting-compiler-embeddable

kotlinCompilerPluginClasspath
\--- org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.4.32
     +--- org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.4.32
     |    +--- org.jetbrains.kotlin:kotlin-scripting-common:1.4.32
     |    |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.4.32
     |    |    |    +--- org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32
     |    |    |    \--- org.jetbrains:annotations:13.0
     |    |    \--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.8
     |    |         +--- org.jetbrains.kotlin:kotlin-stdlib:1.3.71 -> 1.4.32 (*)
     |    |         \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.3.71 -> 1.4.32
     |    +--- org.jetbrains.kotlin:kotlin-scripting-jvm:1.4.32
     |    |    +--- org.jetbrains.kotlin:kotlin-script-runtime:1.4.32
     |    |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.4.32 (*)
     |    |    \--- org.jetbrains.kotlin:kotlin-scripting-common:1.4.32 (*)
     |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.4.32 (*)
     |    \--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.8 (*)
     \--- org.jetbrains.kotlin:kotlin-stdlib:1.4.32 (*)

(*) - dependencies omitted (listed previously)

and sure enough the published artifact references old version of coroutines -> https://repo1.maven.org/maven2/org/jetbrains/kotlin/kotlin-scripting-compiler-impl-e[…]e/1.4.32/kotlin-scripting-compiler-impl-embeddable-1.4.32.pom (release 1.5.10 still points to 1.3.8 coroutines as well). Any ideas why runtime dep would be blowing stuff up?

[no]

You say you are using coroutines 1.4.3 but you are actually using 1.3.8

[Dariusz Kuc]

my build dependencies are specifying coroutines 1.4.3 the above is from the kotlin compiler classpath that I don't have control over it

[Dariusz Kuc]

if you look at the build scan you can see the compile path is using 1.4.3

[no]

The build scan is a successful build

[Dariusz Kuc]

yes I'm getting those exceptions randomly

[Dariusz Kuc]

*and even with the exceptions I'm getting a successful build

[no]

do you have a build scan that shows what you are talking about?

[Dariusz Kuc]

https://github.com/ExpediaGroup/graphql-kotlin/issues/1084

[Dariusz Kuc]

from the linked build scan -> https://scans.gradle.com/s/uvf7bsxzvgwso/console-log#L323

[no]

Thanks. I look a look. Might be with filing a bug on youtrack.

[no]

Does forcing the buildscript classpath to use 1.4.2 fix the issue?

[Dariusz Kuc]

how would i force it? it looks like it is coming from plugins classpath (and I only specify JVM plugin -> https://github.com/ExpediaGroup/graphql-kotlin/blob/master/examples/build.gradle.kts#L5)

[Dariusz Kuc]

actually exception is thrown when executing my plugin which runs using Gradle worker api using its own configuration -> https://scans.gradle.com/s/uvf7bsxzvgwso/dependencies?focusedDependency=WzMsNCwxMjU1L[…]QsWzEyNTVdXV0&toggled=W1szXSxbMV0sWzMsNF0sWzMsNCxbMTI1NV1dXQ

[Dariusz Kuc]

ah wonder whether this is it -> ktor-client-jackson pulls in old version of jackson-module-kotlin (2.10.3) which in turn attempts to pull in old version of kotlin-reflect (1.3.61) which according to dependency tree is updated to correct one.....

[Dariusz Kuc]

jackson version did not make any difference....

[Dariusz Kuc]

i just noticed though that ktor-client-cio-jvm depends on kotlinx-coroutines-core:1.4.2-native-mt and it gets updated to 1.4.3 wonder whether that is causing issues

org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2-native-mt -> 1.4.3

[no]

Nice find. Let me know if that works!

[Dariusz Kuc]

It looks like it is an issue with Ktor HttpClient CIO engine -> when I switched to different engine (Java 11 HttpClient) I no longer get the exception in the logs 🤞 that resolves it

[no]

🦜