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Wednesday, August 26, 2020

How to manage multiple Java JDK versions on macOS X

Installing Java JDK via Homebrew

Install multiple Java JDK versions using Homebrew. To install Homebrew run:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"


Now install the Java JDK version 11 or above using brew cask:

brew cask install java<version> # latest version brew cask install java # LTS 11 brew cask install java11

Note JDK versions prior 11 ( 8 , 9 and 10 ) are no longer supported.

AdoptOpenJDK provides older Java versions. To install the Java JDKs from AdoptOpenJDK:

# install from third party repository brew tap adoptopenjdk/openjdk brew cask install adoptopenjdk<version> # Java 8 brew cask install adoptopenjdk8 # Java 9 brew cask install adoptopenjdk9 # Java 10 brew cask install adoptopenjdk10

Switch Java JDK via alias

Setup your JAVA_HOME path in your .zshrc or .bash_profile for your primary Java version and add an export for each installed Java version.


export JAVA_HOME=$(/usr/libexec/java_home -v14) export JAVA_8_HOME=$(/usr/libexec/java_home -v1.8) export JAVA_11_HOME=$(/usr/libexec/java_home -v11) export JAVA_14_HOME=$(/usr/libexec/java_home -v14)


To check the default Java version and installation path:

java -version


Add an alias to your .zshrc or .bash_profile for each installed Java version. The alias exports JAVA_HOME with the selected JAVA_VERSION_HOME.


alias java8='export JAVA_HOME=$JAVA_8_HOME' alias java11='export JAVA_HOME=$JAVA_11_HOME' alias java14='export JAVA_HOME=$JAVA_14_HOME'


Now, to switch between the Java versions, enter an alias java8 in your terminal. Execute java -version to verify that you are now using the correct Java version.

Note : Alias only changes the Java version in the used terminal instance


Source: https://dev.to/notiz_dev/how-to-manage-multiple-java-jdk-versions-on-macos-x-41mi