How to Manage Multiple Java Versions on Mac OS X with Homebrew and Jenv?

Managing Multiple Java Versions on Mac OS X

Many developers face the need to install and manage multiple Java versions on their Mac OS X machines. This can be particularly useful when developing applications that require different Java versions for compatibility or testing purposes. However, the built-in macOS installer may not allow for the installation of multiple Java versions.

The Homebrew Solution

A popular solution to this issue is to use Homebrew, a package manager for macOS that simplifies the installation and management of software. To install and use Homebrew to manage Java versions, follow these steps:

1. Install Homebrew:

   <code class="shell">/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"</code>

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2. Install Homebrew-Cask and Jenv:

   <code class="shell">brew install homebrew/cask
   brew install jenv</code>

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3. Install Specific Java Versions:

   <code class="shell">brew install --cask temurin8
   brew install --cask temurin9</code>

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4. Add Installed Versions to Jenv:

   <code class="shell">jenv add <javaVersionPathHere></code>

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Additional Notes:

• Homebrew-Cask allows for the installation of different versions of Java through casks. These casks can be found using the brew search temurin command.
• Remember to check the version paths of installed JDKs using /usr/libexec/java_home -V to prevent confusion.
• Jenv provides a convenient way to switch between installed Java versions.

Resources:

• [Removing Java 8 JDK from Mac](https://stackoverflow.com/questions/52437795/how-to-remove-java-8-from-macos)
• [Installing Java 8 and Managing Multiple Versions](http://hanxue-it.blogspot.ch/2014/05/installing-java-8-managing-multiple.html)
• [Homebrew Documentation](http://brew.sh)
• [Jenv Repository](https://github.com/gcuisinier/jenv)

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