HotSpot is the VM from the OpenJDK community. It is the most widely used VM today and is used in Oracle’s JDK. It is suitable for all workloads. For more details see OpenJDK HotSpot. Eclipse OpenJ9 is the VM from the Eclipse community. It is an enterprise-grade VM designed for low memory footprint and fast start-up and is used in IBM’s JDK. Amazon Corretto is a no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK). Corretto comes with long-term support that will include performance enhancements and security fixes.

What is this? The place to collaborate on an open-sourceimplementation of the Java Platform, Standard Edition, and related projects. (Learn more.)Download and installthe open-source JDK for most popular Linux distributions. Oracle'sfree, GPL-licensed, production-ready OpenJDK JDK 15 binariesare at jdk.java.net/15;Oracle's commercially-licensed JDK 15 binaries for Linux,macOS, and Windows, based on the same code, are here.Learn how to use the JDK to write applicationsfor a widerange of environments.Hack on the JDK itself, right here in the OpenJDKCommunity: Browse thecode on the web, clone aMercurial repository to make a local copy, and contribute a patch to fix a bug, enhance anexisting component, or define a new feature.

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

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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:

Mac Install Openjdk 8

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.

Openjdk 11 Download

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