Does not work with Kotlin 2.0.0

[MasWag]

It seems kscript does not work with Kotlin 2.0.0. What I observe is the same as #408:

$ kscript 'println("hello world")' 

Exception in thread "main" java.lang.ClassNotFoundException: kscript.scriplet.Scriplet
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	at Main_Scriplet$Companion.main(Main_Scriplet.kt:5)
	at Main_Scriplet.main(Main_Scriplet.kt)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.jetbrains.kotlin.runner.AbstractRunner.run(runners.kt:70)
	at org.jetbrains.kotlin.runner.Main.run(Main.kt:183)
	at org.jetbrains.kotlin.runner.Main.main(Main.kt:193)
[kscript] [ERROR] Execution of scriplet failed:
[kscript] [ERROR] Command     : 'bash -c /opt/homebrew/Cellar/kotlin/2.0.0/libexec/bin/kotlin  -classpath '/Users/mwaga/Library/Caches/kscript/jar_7a6cdcc8b547b2bb2a0ad2ab4f24c291/scriplet.jar:/opt/homebrew/Cellar/kotlin/2.0.0/libexec/lib/kotlin-script-runtime.jar' Main_Scriplet '
[kscript] [ERROR] Exit Code   : 1   
[kscript] [ERROR] 

It works well with Kotlin 1.9.24 (after cache removal).

$ brew unlink kotlin && brew link [email protected]  && rm -rf ~/Library/Caches/kscript/ && kscript 'println("hello world")'
Unlinking /opt/homebrew/Cellar/kotlin/2.0.0... 6 symlinks removed.
Linking /opt/homebrew/Cellar/[email protected]/1.9.24... 6 symlinks created.
hello world

[NoUsernameProvided]

Same issue here.

[zorenkonte]

Got the same error

[aartiPl]

I will try to solve it, although I don't have much time to invest. Contributions from anyone are more than welcome.

[aartiPl]

I have investigated the issue. The problem with version 2.0 is that it completely changes how the scripts are executed. The current way of executing the script is by wrapping it with the following code:

https://github.com/kscripting/kscript/blob/6acd4e1907478c49cc4e3db640200f926933b15d/src/main/kotlin/io/github/kscripting/kscript/code/Templates.kt#L48

But now, this method does not work anymore.

I was also thinking about a more sophisticated way of rewriting the script so that it is put inside fun main() {} block. But it will only work for some cases - for example, enum class {} can not be defined in the function's local scope, so it will fail if you try to define an enum in your script.

The only possible alternative I can see is to use the Kotlin script engine to implement the KScript engine. I have started the branch with those changes, but I don't have time to accomplish that work: https://github.com/kscripting/kscript/blob/82af53b691f967c6cdad5efadc79965dc1edb932/src/main/kotlin/io/github/kscripting/kscript/KscriptHandler.kt#L133

If anyone wants to take on this task, feel free to do so. I will accept the MRs.

[Dogacel]

@aartiPl if it doesn't work with kotlin 2.0+, is it possible to select which version of kotlin compiler to use? I tried using this for the first time and having the same error.

Maybe we need an environment manager like jenv for kotlin.

[sergeych]

kscript is excellent and missing feature. it has to be upgraded to support koglin 2+, as many new code won't run with older versions, while kotlin's scripting itself is yet practically unusable. Thanks for incredible tool anyway... it was a great time using it.

[appreciated]

For others facing this issue, I faced a slightly different error message:

Exception in thread "main" java.lang.ClassNotFoundException: kscript.scriplet.Client

As a workaround, until there is kotlin 2.0 support, you can downgrade the kotlin version using sdkman:

sdk install kotlin 1.9.24

[kamilmodest]

For me, it doesn't work with 1.9.24 either 🤔

Macbooc M2 Pro (arm)

Installed via

╰─>  sdk install kotlin 1.9.24
╰─>  sdk install kscript
╰─>  where kotlin
/Users/k.babaev/.sdkman/candidates/kotlin/current/bin/kotlin
╰─>  where kscript
/Users/k.babaev/.sdkman/candidates/kscript/current/bin/kscript

Runs:

╰─>  kscript 'println("hello world")'
Exception in thread "main" java.lang.ClassNotFoundException: kscript.scriplet.Scriplet
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	at Main_Scriplet$Companion.main(Main_Scriplet.kt:5)
	at Main_Scriplet.main(Main_Scriplet.kt)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.jetbrains.kotlin.runner.AbstractRunner.run(runners.kt:70)
	at org.jetbrains.kotlin.runner.Main.run(Main.kt:194)
	at org.jetbrains.kotlin.runner.Main.main(Main.kt:204)
[kscript] [ERROR] Execution of scriplet failed:
[kscript] [ERROR] Command     : 'bash -c /Users/k.babaev/.sdkman/candidates/kotlin/1.9.24/bin/kotlin  -classpath '/Users/k.babaev/Library/Caches/kscript/jar_7a6cdcc8b547b2bb2a0ad2ab4f24c291/scriplet.jar:/Users/k.babaev/.sdkman/candidates/kotlin/1.9.24/lib/kotlin-script-runtime.jar' Main_Scriplet '
[kscript] [ERROR] Exit Code   : 1
[kscript] [ERROR]

╰─>  ll /Users/k.babaev/.sdkman/candidates/kscript
Permissions Size User     Group Date Modified    Name
drwxr-xr-x@    - k.babaev staff 2023-07-22 12:07  4.2.3
lrwxr-xr-x@    - k.babaev staff 2025-02-12 18:56  current -> 4.2.3

╰─>  ll /Users/k.babaev/.sdkman/candidates/kotlin
Permissions Size User     Group Date Modified    Name
drwxr-xr-x@    - k.babaev staff 1980-02-01 00:00  1.9.24
lrwxr-xr-x@    - k.babaev staff 2025-02-12 18:39  current -> 1.9.24