Master your Java Environment with jenv

https://github.com/jenv/jenv#readme

1. Installing jenv

   On OSX, the simpler way to install jEnv is using Homebrew

   brew install jenv

   Alternatively, and on Linux, you can install it from source :

   git clone https://github.com/jenv/jenv.git ~/.jenv
   # Shell: bash
   echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
   echo 'eval "$(jenv init -)"' >> ~/.bash_profile
   # Shell: zsh
   echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.zshrc
   echo 'eval "$(jenv init -)"' >> ~/.zshrc

   note: notice your Shell(zsh or bash), find regarding profile(~/.bash_profile or ~/.zshrc).

2. jenv doctor

3. Adding Your Java Environment

   jenv add $(/usr/libexec/java_home)

   add jdk to your jenv.

   jenv add /Library/Java/JavaVirtualMachines/1.8.0.jdk/Contents/Home jdk1.8 added

4. Check java versions.

   jenv versions
   *system (set by /Users/user/.jenv/version)
   11.0
   11.0.2
   openjdk64-11.0.2

5. Setting a Java Version

   jenv global 11.0.2
   jenv shell 11.0.2
   jenv local 11.0.2

6. Using two JVMs on MacOS

   https://github.com/AdoptOpenJDK/homebrew-openjdk

   • latest:

     brew cask install adoptopenjdk

   • Other Versions

     brew tap AdoptOpenJDK/openjdk
     brew cask install <version>

   This will install the latest version of Java 8 to a special directory in macOS. Let’s see which directory that is:

   ls -1 /Library/Java/JavaVirtualMachines
   adoptopenjdk-8.jdk
   openjdk-11.0.2.jdk

   We’ll add the Java home directory using jenv

   jenv add /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/ openjdk64-1.8.0.222 added