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How to manage your Java environments in MacOS
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manage_Java.md

How to manage your Java environments in MacOS

If you are a developer you need sometimes a diferent version of the JDK. MacOS comes also with his own JDK. So, how can you manage all the installed JDKs?

jEnv

jEnv is a command line tool to help you forget how to set the JAVA_HOME environment variable.

Installation and Setup

Install it:

brew install jenv

To set it up execute the following commands at the command line:

export JENV_ROOT=/usr/local/opt/jenv
echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.zshrc
echo 'eval "$(jenv init -)"' >> ~/.zshrc

Search for your JDKs. Usually they are in /Library/Java/JavaVirtualMachines/
Add all the JDKs to jenv:

jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home

List managed JDKs

$ jenv versions
  system
  oracle64-1.6.0.39
* oracle64-1.7.0.11 (set by /Users/hikage/.jenv/version)

Configure global version

$ jenv global oracle64-1.6.0.39

Configure local version (per directory)

$ jenv local oracle64-1.6.0.39

Configure shell instance version

$ jenv shell oracle64-1.6.0.39
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