As of January 25, 2020, other Qiita articles are old and do not work properly & are different from the official document, so I will describe it

Premise

environment

Confirmed with macOS Mojave 10.14.6

Create ~ / .jenv

mkdir ~/.jenv

Install jenv

1. When using homebrew

brew install jenv

2. When cloning from git

git clone https://github.com/jenv/jenv.git ~/.jenv

2-1. bash

echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(jenv init -)"' >> ~/.bash_profile

2-2. zsh

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

Rebooting the shell

manner

Restart the terminal or
exec $SHELL -l

Operation check of jenv

jenv doctor

If it works properly, the following output will be output

[OK]	No JAVA_HOME set
[ERROR]	Java binary in path is not in the jenv shims.
[ERROR]	Please check your path, or try using /path/to/java/home is not a valid path to java installation.
	PATH : /Users/user/.jenv/libexec:/Users/user/.jenv/shims:/Users/user/.jenv/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
[OK]	Jenv is correctly loaded

Check JAVA_HOME settings

echo ${JAVA_HOME}

jenv enable-plugin export
exec $SHELL -l

Java environment installation

When installing Java environment with brew cask

brew cask install java

For Java 8

brew cask install java8

Added Java environment

Use jenv add

jenv add $(/usr/libexec/java_home)

Of course, you may specify the directory directly as follows.

jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home

View Java environment version list

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

By default, system Java is the latest version of Java.

Java environment selection

$ jenv local 11.0.2
$ exec $SHELL -l
$ cat .java-version
11.0.2

Check if it is set

echo ${JAVA_HOME}
/Users/hogehoge/.jenv/versions/11.0.2

Setting is OK with this.

Delete .java -version because you don't need it

rm .java-version

Global Java version settings

Required only when you want to set it globally

jenv global 11.0.2

Shell Java version setting

jenv shell 11.0.2

Common workflow

Use two JVMs on macOS

Install Java 8 where Java 11.0.2 is installed

brew cask install adoptopenjdk8
brew cask install caskroom/versions/adoptopenjdk8

Install the latest version of Java 8 in a special directory on macOS by the above

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

You can see the adoptopenjdk-8.jdk directory. (This directory changes depending on the user) It cannot be obtained from / usr / libexec / java_home, so add it with jenv add.

$ jenv add /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/
openjdk64-1.8.0.222 added
1.8.0.222 added
1.8 added
$ jenv versions
* system
  1.8
  1.8.0.222
  openjdk64-1.8.0.222
  11.0
  11.0.2
  openjdk64-11.0.2
  oracle64-1.8.0.202-ea

reference

With reference to the following, I removed the redundant parts and added the missing parts.

GitHub - jenv/jenv: Manage your Java environment https://github.com/jenv/jenv

that's all.

Install and configure jenv on macOS