To install an earlier version of the JRE, you must first uninstall the current version.

To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. However, the system will not replace the current JRE with a lower version. When you install the JDK, it also installs the JRE.

Administrator privileges are required to install the JDK and JRE on macOS. Installing the JDK and JRE on macOS is performed on a systemwide basis for all users. You cannot install Java for a single user. OpenJDK 64-Bit Server VM 18.The following are the system requirements for installing the JDK and the JRE on macOS: OpenJDK Runtime Environment 18.9 (build 11+28) bash_profile) and then running each alias, now I’ve got OpenJDK 11 set up and ready to go! $ j11 bash_profile, I now have: alias j11='export JAVA_HOME=/usr/libexec/java_home -v 11 java -version'Īlias j10='export JAVA_HOME=/usr/libexec/java_home -v 10 java -version'Īlias j8='export JAVA_HOME=/usr/libexec/java_home -v 1.8 java -version' Updating my aliases to quickly switch versions in my. Once you’ve moved it there, java_home -V now shows the new JDK in place: $ /usr/libexec/java_home -Vġ1, x86_64: 'OpenJDK 11' /Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home gz file to the same location would make sense. 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. Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home To switch between JDKs, use /usr/libexec/java_home -v version (e.g. usr/libexec/java_home -V: This lists all installed JDKs, which is shown below: $ /usr/libexec/java_home -Vġ0, x86_64: 'Java SE 10' /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Homeġ.8.0_151, x86_64: 'Java SE 8' /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home usr/libexec/java_home: This will show you where the current JDK home is, for example: /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home 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. tar.gz for OpenJDK 11 directly from, there’s no obvious installation instructions (at least that I could find) on the OpenJDK website or in the.

Install java 11 macos