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Java: Installing JDK on Mac using Homebrew Published: October 14, 2018 - 1 min read Homebrew is a package manager that makes it easy for us to install all sorts of development tools such as MySQL, Mongo, Ruby on Rails, and Java.

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

If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'. There can be multiple JDKs installed on a system, as many as you wish.
Mac OS X - Mojave 10.14.1 Disclaimer: This webpage is intended to provide you information about patch announcement for certain specific software products. The information is provided 'As Is' without warranty of any kind.

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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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Java is no longer installed with a OS X 10.11 El Capitan clean install, and you’ll find that after updating a Mac a prior version of JRE may no longer function.

You may come across when trying to use some particular applications or web content, “This application requires the legacy Java SE 6 runtime which is unavailable for this version of OS X.” error message, which means if you want to run that app you’re going to need to use an older version of Java.

If you do not need Java, you should not install Java. Java is, and always has been, the source of many security holes.

Here’s how you can install JRE (Java Runtime Environment).

Step 1. Open Safari and go to the Oracle Java downloads page and download the JRE .tar.gz version. You should end up with a file named something similar to jre-8u65-macosx-x64.tar.gz.

Step 2. Go to your Downloads folder and extract the JRE download or use Terminal to extract files:

Step 3. Open Terminal

Step 4. Edit the Info.plist file within to enable the JRE to be used from the the command line, and from bundled applications:

Step 5. Move the JRE folder to the correct location:

Type password on prompt.

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Be sure you are in the correct directory (the JRE folder) when you issue this command, because it will move your current directory to /Library/Java/JavaVirtualMachines/!

Step 6. Create a link to add backwards compatibility for some applications made for older Java versions:

You should be done now, so try and open the application. If it does not work, some applications require legacy Java 6 to be installed.

You can have it installed without actually using it, however, it’s possible to trick the applications into thinking legacy Java 6 is installed, without actually doing so.