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JuPyteR Jupyter-Java License

JuPyteR notebooks also gives us the facility to write notebooks using Java, Scala and other JVM and non-JVM languages in addition to Python, R and Julia.

In theory, the below instructions should work for all operating systems i.e. Linux, MacOS and Windows. Although it has been only tested for Linux and MacOS.

Blogs

Kernels

These are provided using via kernels, for e.g. the IJava kernel when installed, provides Java language support in Jupyter notebooks. Take a look at the docs and examples provided on https://github.com/SpencerPark/IJava.

Pre-requisite: only supports JDK versions 9 and higher

GraalVM compiler can be enabled for JDK 9 and higher, for platforms where it is supported, see table below:

JDK/JRE Version Platforms
Java 9 Linux only
Java 10 Linux and MacOS
Java 11 or higher Linux, MacOS, Windows

Switches to enable the GraalVM compiler in Java 9

  export JAVA_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler"
  export JAVA_TOOL_OPTIONS="${JAVA_TOOL_OPTIONS} ${JAVA_OPTS}"

or

  export ENABLE_GRAALVM_COMPILER="-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler"

  java [-cp] [...] [-jar] [...] \
       ${ENABLE_GRAALVM_COMPILER}

Additional source of kernels

  • beakerx - Is another source where a wider range of kernels can be found (covering many JVM languages).

beakerx

Write kernels

Check out the project https://github.com/SpencerPark/jupyter-jvm-basekernel in order to embark into the world of kernel creation, maybe the example folder is a good one to look at as well.

Get started: Automated (via scripts)

Source location

Go to example project root to perform the commands mentioned in the sections below.

Local environment

$ cd build-docker-image

$ [install Java 9 SDK and set the PATH and JAVA_HOME]
$ ./install-jupyter-notebooks.sh
$ ./install-java-kernel.sh

We should see the below two sets of outputs:

Installing Jupyter notebook and dependencies
JDK9, Linux only: We are enabling JVMCI flags (enabling Graal as Tier-2 compiler)
Graal setting: please check docs for higher versions of Java and for other platforms
PATH=/opt/java/openjdk//bin:/opt/java/openjdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
JAVA_OPTS=-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler
Picked up JAVA_TOOL_OPTIONS: -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler
openjdk 9.0.4
...
Successfully installed MarkupSafe-1.1.1 Send2Trash-1.5.0 attrs-19.1.0 backports-abc-0.5 backports.shutil-get-terminal-size-1.0.0 bleach-3.1.0 configparser-3.8.1 decorator-4.4.0 defusedxml-0.6.0 entrypoints-0.3 enum34-1.1.6 functools32-3.2.3.post2 futures-3.3.0 ipaddress-1.0.22 ipykernel-4.10.1 ipython-5.8.0 ipython-genutils-0.2.0 ipywidgets-7.5.1...

and

A list of already installed kernels in your jupyter environment
Available kernels:
  python2    /[User home]/[path/to]/jupyter/kernels/python2
Downloading the Java kernel version 1.2.0
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   606    0   606    0     0   1419      0 --:--:-- --:--:-- --:--:--  1415
100 5397k  100 5397k    0     0  2321k      0  0:00:02  0:00:02 --:--:-- 4213k
Unzipping the Java kernel version 1.2.0
Archive:  ijava-1.2.0.zip
   creating: java/
  inflating: java/ijava-1.2.0.jar
  inflating: java/kernel.json
   creating: java/dependency-licenses/
   creating: java/dependency-licenses/commons-io-2.5.jar/
   [...snipped...]
  inflating: install.py
Using the install.py command to install Java kernel version 1.2.0.
[InstallKernelSpec] Installed kernelspec java in /[path/to]/jupyter/kernels/java
A list of already installed kernels in your jupyter environment
Available kernels:
  java       /[User home]/[path/to]/jupyter/kernels/java
  python2    /[User home]/[path/to]/share/jupyter/kernels/python2

Docker container

See Docker container instructions

Get started: Manual steps (via CLI)

Check for available kernels

Let's find out what exists in our development environment:

$ jupyter kernelspec list

Here is a sample output depending on what is installed in our development environment:

Available kernels:
  python2    /[User home]/[path/to]/jupyter/kernels/python2

Output might vary slightly depending on how your python environment has been setup.

Download and unzip the kernel (from pre-compiled binary release)

Download the IJava kernel version 1.2.0 with:

$ curl -L https://github.com/SpencerPark/IJava/releases/download/v1.2.0/ijava-1.2.0.zip -O ijava-1.2.0.zip

### ~~~ choose a destination to unzip the archive ~~~

$ unzip ijava-1.2.0.zip

Install the kernel

Pre-requisite: Java 9 should be the current JDK your JAVA_HOME should point to, when installing the pre-compiled binary from https://github.com/SpencerPark/IJava/releases/

Method 1: via the jupyter command on the command-line

$ jupyter kernelspec install java
[InstallKernelSpec] Installed kernelspec java in /[path/to]/jupyter/kernels/java

Note: destination paths may vary hence [path/to].

Method 2: via the python3 command on the command-line

$ python3 install.py --sys-prefix
Installed java kernel into "/[path/to]/jupyter/kernels/java"

Note: destination paths may vary hence [path/to].

Recheck for the now available kernels

Let's find out if the installation was successful:

$ jupyter kernelspec list

We could expect an output like the below:

Available kernels:
  java       /[User home]/[path/to]/jupyter/kernels/java
  python2    /[User home]/[path/to]/jupyter/kernels/python2

Output might vary slightly depending on how your python environment has been setup.

Kernel installation: variety of combinations of environments and JDKs

See Other kernel installation methods

Please take a glance at the above link, especially if jupiter-notebook or jupyter-lab has trouble locating the kernels.

Removing the installed kernel

$ jupyter kernelspec remove java

Interaction to confirm removal of the kernel:

Kernel specs to remove:
  java                  /[User home]/[path/to]/jupyter/kernels/java
Remove 1 kernel specs [y/N]: y
[RemoveKernelSpec] Removed /[User home]/[path/to]/jupyter/kernels/java

Note: destination paths may vary hence [path/to].

Ensure you are currently in the right python environment to be able to remove the kernel installed in the said environment.

Usage and examples

See README section on SpencerPark/IJava for a whole number of examples and usages.

Also checkout the live links (JuPyteR notebooks online).

Enjoy writing prototypes, experiments or do some real work with it, in Java, Scala or any other kernel of your choice.

Credits for the inspiration

Inspired by these tweets:

Thank you @nicolas_frankel and the good folks behind beakerx.com.

Contributing

Contributions are very welcome, please share back with the wider community (and get credited for it)!

Please have a look at the CONTRIBUTING guidelines, also have a read about our licensing policy.


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