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Installing Java

This chapter describes how to install java as it might be a dependancy for our work. For example Spark requires Java 8.

This is not a guide for writing Java code.

TLDR to get started

If you just want the quick commands for the installation.

brew install cask jenv
brew tap caskroom/versions
brew cask install java java8

You will also need to edit your .bash_profile. See below.

Get started with detailed descriptions

We assume you already have installed Homebrew to get packages for Mac OS.

You will need cask.

brew install cask

Tap cask versions to get access to older versions of java.

brew tap caskroom/versions

Install Java 8. This installation will require that you input your password near the end, before the installation can complete.

brew cask install java8

If you want or need the latest Java version.

brew cask install java

JDKs will be installed at the following directories. Your JDKs versions might be different.

/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/
/Library/Java/JavaVirtualMachines/jdk10.0_2.jdk/Contents/Home/

This is a tool for creating Java virtual environments.

brew install jenv

Editing .bash_profile (initialize jEnv)

Open this file for editing (using whatever editor).

atom ~/.bash_profile

Add this:

if which jenv > /dev/null; then eval "$(jenv init -)"; fi

Then source your bash_profile file

source ~/.bash_profile

Creating a Java Virtual Environment

We will be using jEnv to create Java virtual environments. Official jEnv docs

jEnv doesn’t install JDKs, so we have to tell jEnv where to look for them. Type these commands to register JDKs in jEnv (replace the versions with yours):

jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/
jenv add /Library/Java/JavaVirtualMachines/jdk10.0_2.jdk/Contents/Home/

After that, run this command to list all registered JDKs:

jenv versions

You can set global Java version like this:

jenv global 10.0

And in your project folder you can use another version like this: You can set global Java version like this:

cd my-project-folder
jenv local 1.8

The above command will create a .java-version file at project root.

Detailed description