With Mac OS 10.7 (Lion) and later, the Java runtime is no longer installed automatically as part of the OS installation. Follow any of the methods below to install Java runtime. These downloads are intended for established users, and contain the latest IBM fixes and Oracle updates to the Java SE application programming interfaces (APIs). To take advantage of new capabilities in the SDK, users are encouraged to move to the latest version. Years ago, Apple joined the OpenJDK project, transferring their formerly proprietary macOS-specific JVM code as free-of-cost open-source. Apple ceased distribution of their own branded JVM/JDK, relying on Oracle’s branded releases to include a version for macOS. Beginning with Visual Studio 15.9 and Visual Studio for Mac 7.7, Visual Studio Tools for Xamarin has moved from Oracle’s JDK to a lightweight version of the OpenJDK that is intended solely for Android development. This is a required migration as Oracle is ending support for commercial distribution of JDK 8 in 2019, and JDK 8 is a required. Mac OS X Tutorials and App reviews from HowTech 52,036 views 0:56 🔧 How to Optimize Windows 10 For GAMING & Performance in 2019 The Ultimate Updated GUIDE - Duration: 36:09.

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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!

Published at DZone with permission of Kevin Hooke, DZone MVB. See the original article here.

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