Mac OS X and multiple Java versions

Question

How can I install an additional java on MacOS   I installed jdk8 and that works fine  but now I need a jdk7 installation for development purposes  When trying to install the old version via DMG file  i get a warning  that there is already a newer version of java installed and the installer quits      usr libexec java home -verbose Matching Java Virtual Machines  1       1 8 0 20  x86 64     Java SE 8   Library Java JavaVirtualMachines jdk1 8 0 20 jdk Contents Home      Library Java JavaVirtualMachines jdk1 8 0 20 jdk Contents Home   How to install jdk7 in addition to this one   Thanks Dakky

User · Answer

In the same spirit than  Vegard  lightweight     Install the wanted JDKs with Homebrew Put this jdk bash function and a default in your  profile  jdk         version  1     export JAVA HOME    usr libexec java home -v  version        java -version     export JAVA HOME    usr libexec java home -v11     Your default version  and then  to switch your jdk  you can do    jdk 9  jdk 11  jdk 13    Based on https   github com AdoptOpenJDK homebrew-openjdk

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I find this Java version manager called Jabba recently and the usage is very similar to version managers of other languages like rvm ruby   nvm node   pyenv python   etc  Also it s cross platform so definitely it can be used on Mac    After installation  it will create a dir in    jabba to put all the Java versions you install  It  Supports installation of Oracle JDK  default    Server JRE  Zulu OpenJDK  since 0 3 0   IBM SDK  Java Technology Edition  since 0 6 0  and from custom URLs      Basic usage is listed on their Github  A quick summary to start    curl -sL https   github com shyiko jabba raw master install sh   bash  amp  amp       jabba jabba sh    install Oracle JDK jabba install 1 8    jabba use 1 8  will be called automatically   jabba install 1 7    jabba use 1 7  will be called automatically     list all installed JDK s jabba ls    switch to a different version of JDK jabba use 1 8

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First  you need to make certain you have multiple JAVA versions installed  Open a new Terminal window and input   usr libexec java home -V  Your output should look like  Matching Java Virtual Machines  2   11 0 1  x86 64   quot Java SE 11 0 1 quot   Library Java JavaVirtualMachines jdk-11 0 1 jdk Contents Home 1 8 0 201  x86 64   quot Java SE 8 quot   Library Java JavaVirtualMachines jdk1 8 0 201 jdk Contents Home  Note that there are two JDKs available  If you don   t notice the Java version you need to switch to  download and install the appropriate one from here  JDK 8 is represented as 1 8    Once you have installed the appropriate JDK  repeat this step   Take note of the JDK version you want to switch to  For example     11 0    and    1 8    are the JDK versions available in the example above   Switch to the desired version  For example  if you wish to switch to JDK 8  input the following line  export JAVA HOME  usr libexec java home -v 1 8   For 11 0  switch    1 8    with    11 0    4  Check your JDK version by inputting into Terminal  java -version  If you have followed all the steps correctly  the JDK version should correlate with the one you specified in the last step  5   Optional  To make this the default JDK version  input the following in Terminal  open    bash profile  Then  add your Terminal input from step 3 to this file  SWITCH TO JAVA VERSION 8 export JAVA HOME   usr libexec java home -v 1 8   Save and close the file

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I followed steps in below link - https   medium com  euedofia fix-default-java-version-on-maven-on-mac-os-x-156cf5930078 and it worked for me  cd  usr local Cellar maven 3 5 4 bin  nano mvn --Update JAVA HOME - gt   quot   JAVA HOME -   usr libexec java home   quot  mvn -version

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Here s a more DRY version for bash  Based on Vegard s answer   Replace 1 7 and 1 8 with whatever versions you are interested with and you ll get an alias called  javaX   where  X  is the java version  7   8 in the snippet below  that will allow you to easily switch versions  for version in 1 7 1 8  do     v    version  -1       h JAVA   v  HOME      export   h     usr libexec java home -v  version       alias  java v   export JAVA HOME    h  done

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Manage multiple java version in MAC using jenv  Install homebrew using following command   bin bash -c  quot   curl -fsSL https   raw githubusercontent com Homebrew install master install sh  quot   install jenv and activate jenv  brew install jenv echo  eval  quot   jenv init -  quot    gt  gt     bash profile  tap cask-versions  brew tap homebrew cask-versions  search available java version that can be installed  brew search java  E g  to install java6 use following command  brew install cask java6  Add multiple versions of java in jenv  jenv add  Library Java JavaVirtualMachines jdk1 8 0 231 jdk Contents Home jenv add  Library Java JavaVirtualMachines 1 6 0 jdk Contents Home Note - if you get error like       ln   Users   jenv versions oracle64-1 8 0 231  No such file or directory  then run following - mkdir -p  Users   jenv versions oracle64-1 8 0 231  Rehash jenv after adding jdk   s  jenv rehash  List known versions of java to jenv  jenv versions  Set default version  jenv global oracle64-1 8 0 231  Change java version for a project  jenv local oracle64-1 6 0 65  set JAVA HOME with the same version as jenv  jenv exec bash echo  JAVA HOME

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SDKMAN  is a great tool for using multiple versions of Java  Gradle  Groovy  Kotlin  and other JVM tools on Mac OS  Installation and usage doc are plainly on the main site    I have no affiliation  just a happy user    As an example usage  if I type the following in a Terminal window  there is a list of available Java SDK versions  edited for brevity      sdk list java Available Java Versions      9ea170                                                                           gt    8u131                                                                               7u141-zulu                        Here   denotes that the version is installed   gt  denotes which version is currently in use  To install a version     sdk install java 7u141-zulu   To use a version in this Terminal window     sdk use java 9ea170

User · Answer

Uninstall jdk8  install jdk7  then reinstall jdk8   My approach to switching between them  in  profile     export JAVA 7 HOME    usr libexec java home -v1 7  export JAVA 8 HOME    usr libexec java home -v1 8  export JAVA 9 HOME    usr libexec java home -v9   alias java7  export JAVA HOME  JAVA 7 HOME  alias java8  export JAVA HOME  JAVA 8 HOME  alias java9  export JAVA HOME  JAVA 9 HOME    default java8 export JAVA HOME  JAVA 8 HOME   Then you can simply type java7 or java8 in a terminal to switch versions    edit  updated to add Dylans improvement for Java 9

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To install more recent versions of OpenJDK  I use this  Example for OpenJDK 14   brew info adoptopenjdk brew tap adoptopenjdk openjdk brew cask install adoptopenjdk14   See https   github com AdoptOpenJDK homebrew-openjdk for current info

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Jenv on Mac Sierra   if not working after install  do this bug fix to add java executable to path  export PATH   HOME  jenv shims  PATH    even though eval    jenv init -   could do this job  The reason is  bin folder is not there anymore as describe in it s homepage  but shim folder is used as  bin instead    Make sure    jenv is there which java may print  Library     jenv global 1 8 jenv shell 1 8   Eventually  which java gives you       Users xxxx  jenv shims java

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I answer lately and I really recommand you to use SDKMAN instead of Homebrew  With SDKMAN you can install easily different version of JAVA in your mac and switch from on version to another   You can also use SDKMAN for ANT  GRADLE  KOTLIN  MAVEN  SCALA  etc    To install a version in your mac you can run the command sdk install java 15 0 0 j9-adpt

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As found on this website So Let   s begin by installing jEnv   Run this in the terminal  brew install https   raw github com gcuisinier jenv homebrew jenv rb  Add jEnv to the bash profile  if which jenv  gt   dev null  then eval    jenv init -    fi  When you first install jEnv will not have any JDK associated with it   For example  I just installed JDK 8 but jEnv does not know about it  To check Java versions on jEnv  At the moment it only found Java version jre  on the system  The   shows the version currently selected  Unlike rvm and rbenv  jEnv cannot install JDK for you  You need to install JDK manually from Oracle website  Install JDK 6 from Apple website  This will install Java in  System Library Java JavaVirtualMachines   The reason we are installing Java 6 from Apple website is that SUN did not come up with JDK 6 for MAC  so Apple created modified its own deployment version  Similarly install JDK7 and JDK8  Add JDKs to jEnv   JDK 6   JDK 7    JDK 8   Check the java versions installed using jenv   So now we have 3 versions of Java on our system  To set a default version use the command  jenv local  lt jenv version gt    Ex     I wanted Jdk 1 6 to start IntelliJ  jenv local oracle64-1 6 0 65  check the java version  java -version    That   s it  We now have multiple versions of java and we can switch between them easily  jEnv also has some other features  such as wrappers for Gradle  Ant  Maven  etc  and the ability to set JVM options globally or locally  Check out the documentation for more information

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New commands for installing Java via Homebrew   brew cask install adoptopenjdk openjdk adoptopenjdk8 brew cask install adoptopenjdk openjdk adoptopenjdk11  See the homebrew-openjdk repo for the latest commands  Installing Java You can install Java via Homebrew  Jabba  SDKMAN or manually   See this answer for details on all the commands  Switching Java versions  You can switch Java versions with jenv Jabba  SDKMAN or manually   See details on all the switching commands here  Best solutions  Jabba is designed to work on multiple platforms  so it s a good option if you want a solution that ll also work on Windows Using Homebrew to download Java versions and jenv to switch versions provides a nice workflow   jenv makes it easy to work with Java versions stored in any directory on your machine  so it s a good alternative if you re interested in storing Java in non-default directories  Using SDKMAN to download Javas and switch versions is another great alternative Manually switching should be avoided because it s an unnecessary headache   Function to manually switch Java versions Here s the Bash   ZSH function for manually switching Java versions  by OpenJDK   jdk             version  1         export JAVA HOME    usr libexec java home -v quot  version quot            java -version     There are great tools for switching Java versions  so I highly recommend against doing it manually

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For macOS Sierra 420  This guide was cobbled together from various sources  replies above as well as other posts   and works perfect   0  If you haven t already  install homebrew   See https   brew sh   1  Install jenv  brew install jenv   2  Add jenv to the bash profile  if which jenv  gt   dev null  then eval    jenv init -    fi   3  Add jenv to your path  export PATH   HOME  jenv shims  PATH    4  Tap  caskroom versions   FYI   Tap  extends brew s list of available repos it can install  above and beyond brew s default list of available repos   brew tap caskroom versions   5  Install the latest version of java  brew cask install java   6  Install java 6  or 7 or 8 whatever you need   brew cask install java6  brew cask install java7  brew cask install java8     Maybe close and restart Terminal so it sees any new ENV vars that got setup   7  Review Installations  All Java version get installed here   Library Java JavaVirtualMachines lets take a look   ls -la  Library Java JavaVirtualMachines   8  Add each path to jenv one-at-a-time   We need to add   Contents Home  to the version folder  WARNING  Use the actual paths on your machine    these are just EXAMPLE s  jenv add  Library Java JavaVirtualMachines 1 6 0   EXAMPLE    Contents Home jenv add  Library Java JavaVirtualMachines jdk-9 0 1 jdk   EXAMPLE    Contents Home   9  Check if jenv registered OK  jenv versions   10  Set java version to use  globably   Where XX matches one of the items in the versions list above   jenv global XX   Check java version  java -version   Check jenv versions  Should also indicate the current version being used with an asterisk   jenv versions   DONE    Quick future reference  To change java versions       See the list of available java versions  jenv versions       then  where XX matches an item in the list above  jenv global XX

User · Answer

The cleanest way to manage multiple java versions on Mac is to use Homebrew   And within Homebrew  use    homebrew-cask to install the versions of java jenv to manage the installed versions of java     As seen on http   hanxue-it blogspot ch 2014 05 installing-java-8-managing-multiple html   these are the steps to follow    install homebrew install homebrew jenv install homebrew-cask install a specific java version using cask  see  homebrew-cask versions  paragraph below  add this version for jenv to manage it check the version is correctly managed by jenv repeat steps 4 to 6 for each version of java you need     homebrew-cask versions  Add the homebrew cask-versions tap to homebrew using   brew tap homebrew cask-versions   Then you can look at all the versions available   brew search java   Then you can install the version s  you like   brew cask install java7 brew cask install java6   And add them to be managed by jenv as usual   jenv add  lt javaVersionPathHere gt    I think this is the cleanest  amp  simplest way to go about it     Another important thing to note  as mentioned in Mac OS X 10 6 7 Java Path Current JDK confusing       For different types of JDKs or installations  you will have different   paths      You can check the paths of the versions installed using  usr libexec java home -V  see How do I check if the Java JDK is installed on Mac       On Mac OS X Mavericks  I found as following       1  Built-in JRE default   Library Internet    Plug-Ins JavaAppletPlugin plugin Contents Home      2  JDKs downloaded from Apple   System Library Java JavaVirtualMachines 1 6 0 jdk Contents Home       3  JDKs downloaded from Oracle   Library Java JavaVirtualMachines jdk1 8 0 11 jdk Contents Home     Resources   Removing Java 8 JDK from Mac http   hanxue-it blogspot ch 2014 05 installing-java-8-managing-multiple html http   sourabhbajaj com mac-setup index html http   brew sh https   github com Homebrew homebrew tree master share doc homebrew readme http   sourabhbajaj com mac-setup Homebrew README html  brew tap    explained https   github com Homebrew homebrew blob master share doc homebrew brew-tap md    brew versions    explained Homebrew install specific version of formula  and also https   github com Homebrew homebrew-versions https   github com caskroom homebrew-cask    cask versions     similar to    brew versions     see https   github com caskroom homebrew-versions and also https   github com caskroom homebrew-cask issues 9447 http   www jenv be https   github com gcuisinier jenv

User · Answer

I am using Mac OS X 10 9 5  This is how I manage multiple JDK JRE on my machine when I need one version to run application A and use another version for application B   I created the following script after getting some help online     bin sh function setjdk       if      -ne 0    then    removeFromPath   Library Java JavaVirtualMachines      if   -n    JAVA HOME x      then     removeFromPath  JAVA HOME    fi    export JAVA HOME  Library Java JavaVirtualMachines  1 Contents Home    export PATH  JAVA HOME bin  PATH   fi     function removeFromPath       export PATH   echo  PATH   sed -E -e  s   1    -e  s  1           setjdk jdk1 8 0 60 jdk setjdk jdk1 7 0 15 jdk   I put the above script in  profile file  Just open terminal  type vi  profile  append the script with the above snippet and save it  Once your out type source  profile  this will run your profile script without you having to restart the terminal  Now type java -version it should show 1 7 as your current version  If you intend to change it to 1 8 then comment the line setjdk jdk1 7 0 15 jdk and uncomment the line setjdk jdk1 8 0 60 jdk  Save the script and run it again with source command  I use this mechanism to manage multiple versions of JDK JRE when I have to compile 2 different Maven projects which need different java versions

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