The system will not install a JRE that has an earlier version than the current version. If you want to install Java 17 JDK natively on have multiple options. When you install the JRE, you can install only one JRE on your system at a time. 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. brew tap adoptopenjdk/openjdk Install the JDK: brew install -cask adoptopenjdk11 Install Gradle: brew install gradle You now are ready to get started with the Java track of Exercism To get started, see 'Running the Tests'. However, the system will not replace the current JRE with a lower version. Tap the Homebrew Cask this allows us to install pre-built binaries like the JDK. 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. Then we need to open and edit ist: sudo nano /Applications/UniFi.app/Contents/istĪnd add the following JVMRuntime section manually after the JVMOptions JVMRuntimeĪfter this, the UniFi Controller should run without problems.The following are the system requirements for installing the JDK and the JRE on macOS: brew search openjdk to find all available Java-related formula.

I’m going to assume you have Adopt OpenJDK installed, preferably via Homebrew – if not, then install Homebrew and then: brew tap AdoptOpenJDK/openjdkĪfter this, you should be able to run Java runtime on your Mac – let’s get back to making UniFi Controller run.įirst, we need to link our current Java to the UniFi.app sudo ln -s /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/ /Applications/UniFi.app/Contents/PlugIns

Starting the Unifi Controller under recent macOS versions with OpenJDK installed can cause problems, such as one of the following warnings:

Brew install java runtime