Hello! Is there a way to use kotlinx.coroutines with Kotlin Jupyter Kernel?

# datascience

[Rafał Trójczak]

Hello! Is there a way to use kotlinx.coroutines with Kotlin Jupyter Kernel?

[altavir]

There are no limitation on usage of coroutines with the Jupyter. It is fully supported

[Rafał Trójczak]

ok, but how can I add kotlinx.coroutines as a dependency for my notebook?

[altavir]

@DependsOn("org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.4.3")

[altavir]

Or something like that. I am writing from memory

[Rafał Trójczak]

so I have something like this now:

@file:DependsOn("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.3")

import kotlinx.coroutines.GlobalScop
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

fun main() {
    GlobalScope.launch {
        delay(1000L)
        println("World!")
    }
    println("Hello,")
    Thread.sleep(2000L)
}

[Rafał Trójczak]

and get:

Line_171.jupyter.kts (3:8 - 15) Unresolved reference: kotlinx
Line_171.jupyter.kts (4:8 - 15) Unresolved reference: kotlinx
Line_171.jupyter.kts (5:8 - 15) Unresolved reference: kotlinx
Line_171.jupyter.kts (8:5 - 16) Unresolved reference: GlobalScope
Line_171.jupyter.kts (9:9 - 14) Unresolved reference: delay

[altavir]

You forgot -jvm suffix. Jupyter resolver can't read gradle metadata.

[Rafał Trójczak]

you mean -jvm in the @file:DependsOn line? Like this:

@file:DependsOn("org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.4.3")

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

fun main() {
    GlobalScope.launch {
        delay(1000L)
        println("World!")
    }
    println("Hello,")
    Thread.sleep(2000L)
}

[Rafał Trójczak]

still doesn't work

[altavir]

main won't work in the notebook

[altavir]

just write your code in the cell

[Rafał Trójczak]

🤦‍♂️

[Rafał Trójczak]

of course!

[Rafał Trójczak]

I forgot

[Rafał Trójczak]

thanks for the help!

[altavir]

without main works perfectly fine for me. You can also play with the new Notebook API.

[Rafał Trójczak]

I also used the code in the notebook that was running for a few weeks now, so I guess there could be something messed up in it