Could not find or load main class coursier.bootstrap.launcher.Launcher #1233
Description
Hello,
I'm trying to setup a test jupyterhub with nbgrader instance that uses a scala kernel.
I've been following the instructions and I can't seem to get it to work.
I'm installing almond with the --global option as if it's ommited jupyter kernelspec list does not find the scala kernel.
The installation steps I followed (after downloading the courier file using curl as per the instructions)
jupyter kernelspec list
Available kernels:
python3 /usr/local/share/jupyter/kernels/python3
gordon@jupyter-playground:~$ sudo ./coursier launch --fork almond -- --install --global
[sudo] password for gordon:
Installed scala kernel under /usr/local/share/jupyter/kernels/scala
gordon@jupyter-playground:~$ jupyter kernelspec list
Available kernels:
python3 /usr/local/share/jupyter/kernels/python3
scala /usr/local/share/jupyter/kernels/scala
Upon launching a jupyter notebook instance, I do indeed see the scala kernel
But after a couple of seconds, I it gets disconnected, the Scala icon disappears and the text goes to 'No Kernel'
Jupyter notebook console I get the error :
[I 2023-08-11 13:00:14.872 ServerApp] 200 GET /user/instructor1/api/sessions?1691751614855 (instructor1@::ffff:127.0.0.1) 2.65ms
[I 2023-08-11 13:00:14.888 ServerApp] 200 GET /user/instructor1/api/kernelspecs?1691751614877 (instructor1@::ffff:127.0.0.1) 3.40ms
Error: Could not find or load main class coursier.bootstrap.launcher.Launcher
Caused by: java.lang.ClassNotFoundException: coursier.bootstrap.launcher.Launcher
Followed by multiple retries until a "Kernel Does not Exist" error is thrown.
I've tried with almond kernel 0.10.0 but had a similar error, instead it was a 'Class almond.ScalaKernel not found' error.
My java version output is :
java -version
openjdk version "11.0.20" 2023-07-18
OpenJDK Runtime Environment (build 11.0.20+8-post-Ubuntu-1ubuntu122.04)
OpenJDK 64-Bit Server VM (build 11.0.20+8-post-Ubuntu-1ubuntu122.04, mixed mode, sharing)
I'm at a loss as to what to do here, any help or ideas would be appreciated.