A quick post on installing Java versions and jenv, a Java environment manager on mac OS using Homebrew in terminal.
brew help or brew cask help to see help commands for Homebrew and Homebrew Cask, you may need to run brew install brew-cask
brew cask install java - will install latest version of java, currently openjdk 12.0.1
Some programs need a specific java version to be able to run. I’m trying to attend a workshop on Samsung Wearable App development this week, which uses Samsung’s Tizen Studio IDE. Tizen Studio seems to require Java 8, 9 or OpenJDK 10. (OpenJDK is an open source version of Java, compared to the versions provided by Oracle. Oracle also contributes to openjdk and oraclejdk is built from it, so there aren’t major technical differences.)
try brew search jdk or brew search java to see if casks or brews are available to install for other java versions
brew tap AdoptOpenJDK/openjdk - I ended up using this command to tap for openjdk casks to install
brew cask install adoptopenjdk10 to install openjdk10
Your installed Java versions should be in /Library/Java/JavaVirtualMachines
brew install jenv - Install a Java environment manager to manage versions, like rvm (ruby version manager).
if which jenv > /dev/null; then eval "$(jenv init -)"; fi
Use the above line to initialize jenv in your terminal, then individually add each of your jenv versions.
jenv add /Library/Java/JavaVirtualMachines/adoptopenjdk-10.jdk/Contents/Home
jenv add /Library/Java/JavaVirtualMachines/openjdk-12.0.1.jdk/Contents/Home
If you actually navigate to these files in finder (root directory, not in user!), your jdk versions may or may not have /Contents/Home files inside, but you must append it to your command in order to add the Java version to jenv.
jenv versions to see which Java versions you have installed.
jenv global 10.0 to set a java version as global. Substitute 10.0 with a version from jenv versions list.
jenv local 10.0 You can also navigate to a project specific directory and set a local default Java version. This will create a .java-version file at the project root
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