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in Datalore is there a way to add the `--add-opens=java.base/java.nio=ALL-UNNAMED` for Arrow support?

There is an instruction in the notebook to add jvm args, but I always forget how it is done...

like a Kotlin demo notebook? I have been looking through the documentation but might have missed the example notebook that had it

I am trying to find it. For some reason it is undocummented.

Ah, sorry, it works only on kotlin compiler options, not on JVM args. You need <https://github.com/Kotlin/kotlin-jupyter#creating-kernels> to pass JVM args

thanks. I was looking at that a bit. Is the default kernel in DataLore known/discoverable? To make it as similar as possible. I guess I can create a new one from the terminal but not sure how to activate it. I think I saw something about `init.sh` last night. Need to find that again

maybe I should try to see if `KOTLIN_JUPYTER_JAVA_OPTS` or `KOTLIN_JUPYTER_JAVA_OPTS_EXTRA` work as secrets on the default kernel

Probably not. You have access to the terminal so you can proably change configuraion manually through terminal...

Hi! You need to add KERNEL_JAVA_OPTS environment variable with the value `--add-opens=java.base/java.nio=ALL-UNNAMED`  to your environment
<https://github.com/Kotlin/kotlin-jupyter/blob/master/distrib/run_kotlin_kernel/run_kernel.py#L68|https://github.com/Kotlin/kotlin-jupyter/blob/master/distrib/run_kotlin_kernel/run_kernel.py#L68>

Yes, it's a secret
<https://www.jetbrains.com/help/datalore/dl-create-a-secret.html|https://www.jetbrains.com/help/datalore/dl-create-a-secret.html>

There was init.sh but it doesn't work now

You will probably need to stop and restart machine, not just restart notebook

I got it working with `KOTLIN_JUPYTER_JAVA_OPTS_EXTRA`  . I restarted the machine and verified the  `KERNEL_JAVA_OPTS` was in the /proc/{pid}/environ for both the java kernel process and its parent but it didn't modify the java command.

I tried these first, `KERNEL_JAVA_OPTS`  , `KERNEL_EXTRA_JAVA_OPTS`, `KOTLIN_JUPYTER_JAVA_OPTS`  (this one is overwritten)

But this one works `KOTLIN_JUPYTER_JAVA_OPTS_EXTRA`

<@UQ8NE6A86> I think it is worth mentioning this problem to DataLore team. Each notebook has an `environment` file. Maybe jvm keys should go there.

I asked them explicitly, they say it's the only way for now