How Can I Manage Multiple Java Versions on Mac OS X?

Managing Multiple Java Versions on Mac OS X

You may encounter an issue when trying to install multiple Java versions on Mac OS X, particularly if you have previously installed a newer version and want to add an older version. This is because the macOS installer prevents installing an older version when a newer one is already present.

Solution Using Homebrew

The recommended solution to manage multiple Java versions on Mac OS X is to use Homebrew. Homebrew is a package manager that simplifies the installation and management of software on Mac OS X. To use Homebrew, follow these steps:

1. Install Homebrew: Visit the Homebrew website to install it, if it's not already.
2. Install Homebrew jenv: brew install jenv
3. Install Homebrew-cask: brew install homebrew-cask
4. Install a specific Java version: Use the Homebrew-cask command to install the desired Java version. For example, for Java 8: brew install --cask temurin8
5. Add the version to jenv: jenv add
6. Verify the version is managed by jenv: jenv versions

Managing Java Paths

It's important to note that different Java installations may have different paths on Mac OS X. You can use the following command to check installed paths:

/usr/libexec/java_home -V

This will provide information about the paths for both built-in and installed Java versions.

Additional Resources

• [Homebrew documentation](https://docs.brew.sh/)
• [jenv documentation](https://jenv.be/)
• [Managing Multiple Java Versions on Mac OS X](https://hanxue-it.blogspot.ch/2014/05/installing-java-8-managing-multiple.html)

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