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Need help installing OpenJDK 11 on MacOS? Click here to learn how in this simple, easy-to-follow tutorial with sample code!

If you prefer to use the Java version provided by the OpenJDK website, you will need to use Java 13. Start by getting OpenJDK, chose the macOS version. Extract the archive by double clicking on the file or, assuming it is in your Downloads folder, write this in your Terminal: 1 cd /Downloads 2 tar xf openjdk-13osx-x64bin.tar.gz. Quick guide to download and install OpenJDK 8 on Fedora, Oracle & Redhat Linux. OpenJDK Community Version. What is OpenJDK. OpenJDK is the short form of Open Java Development Kit similar to Oracle's Java Development Kit used to develop Java Applications. However, you will still be able to download post-january Java 8 distributions on the Oracle website. So I hope they will make it crystal clear that those new versions will be incompatible with a business activity. Anyway, updating to OpenJDK builds and leave Oracle (Open)JDK behind remain a good thing to avoid this licensing mess.
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If you download the .tar.gz for OpenJDK 11 directly from http://jdk.java.net/11/, there’s no obvious installation instructions (at least that I could find) on the OpenJDK website or in the .gz file. If you’ve done any fiddling with different JDK versions on MacOS before, you’ve probably come across the ‘/usr/libexec/java_home’ utility, which composes a number of useful things relating to the JDK that you’re currently using in your PATH. Click here for my previous article about this utility and answers to this StackOverflow post, which includes one of the most extensive and useful guides to running different JDK versions on MacOS that I’ve seen.

/usr/libexec/java_home: This will show you where the current JDK home is, for example:


/usr/libexec/java_home -V: This lists all installed JDKs, which is shown below:


To switch between JDKs, use /usr/libexec/java_home -v version (e.g. 10):


Knowing that your available JDKs are installed to /Library/Java/JavaVirtualMachines/ by default, moving the contents of the downloaded OpenJDK 11 dir from inside the .gz file to the same location would make sense.

Once you’ve moved it there, java_home -V now shows the new JDK in place:


Updating my aliases to quickly switch versions in my .bash_profile, I now have:


Sourcing the .bash_profile (source .bash_profile) and then running each alias, now I’ve got OpenJDK 11 set up and ready to go!


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This article shows you how to install Java on Mac OSX, and also how to do Java/JDK version switching.
Tested with
Note
On Mac OSX, Java should installed in this folder; it is Mac’s standard.
We will show you two ways to install Java JDK on Mac, via the popular Homebrew package manager and manually installation.

1. Homebrew

1.1 Install Homebrew and update it.
1.2 Add adoptopenjdk/openjdk.
1.3 Find all available JDK.
The output may vary.
1.4 Java 8, 9, 10, 11, 12, 13, choose one to install.
This example will install Java 8 and 11 for testing.
1.5 Where Java is installed? /usr/libexec/java_home -V
Homebrew will install the JDK at folder /Library/Java/JavaVirtualMachines/, and this folder is Mac’s standard folder for Java installs.
1.6 Test it, by default, Mac takes the highest version.
1.7 How to do version switching? Refer to below 3. version switching

2. Manual installation

The example shows you how to download the early access JDK 14 and install it on Mac OSX.
Steps
2.1 Download the early access JDK 14 from the OpenJDK website.
2.2 Extracts tar file to /Library/Java/JavaVirtualMachines
2.3 Export JAVA_HOME.
Find out where is JDK 14.
Create or edit the existing ~/.bash_profile with a text editor.
Export JAVA_HOME, save and exit.
~/.bash_profile
Reflect the changes

Mac Openjdk8

2.4 Test it.

3. Version Switching

In this tutorial, we installed the Java 8 and Java 11 via Homebrew (Step 1), and Java 14 manually (Step 2), so this Mac has three versions now. And the Mac is using the JDK 14.
Note
There are tools like jEnv to manage the Java version switching, but I prefer to manage with export JAVA_HOME manually, it’s simple and easy to understand, no black box magic.
3.1 Create or edit the existing ~/.bash_profile with a text editor like vim or nano, export JAVA_HOME to the specified JDK we want to use on Mac.
Openjdk 8 msi
The above changes will make JAVA_HOME point to JAVA 8.
3.2 Reflect the changes.
Done.
If we want to switch JDK version again, update the ~/.bash_profile and export JAVA_HOME to other JDK version.

References

Install Openjdk 7 Mac

Tags : beginnerinstall jdkinstall-javamac

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