For some time now, Java is not (pre-)installed anymore, let’s fix that. As I’m writing this, Java 19.0.1 is the latest version and Adoptium is one of the best places to find Prebuilt OpenJDK Binaries.
Adoptium was known as AdoptOpenJDK, before the project was moved to the Eclipse Foundation. All available versions for supported platforms can be found here.
If you are already using Homebrew then the easiest way to get the JDK on to your Mac might be this:
$brew install --cask temurin # Install a specific version $brew tap homebrew/cask-versions $brew install --cask temurin11 # Uninstall a specific version $brew uninstall --cask temurin
Otherwise, the easiest way is to select macOS x64 and OpenJDK 19, download and install the pkg file.
Like you can see, the package installer will put the JDK into this location:
Almost done. After opening a terminal, the successful installation of the JDK can be confirmed like so:
… hopefully showing something like this:
openjdk 19.0.1 2022-10-18 OpenJDK Runtime Environment Temurin-19.0.1+10 (build 19.0.1+10) OpenJDK 64-Bit Server VM Temurin-19.0.1+10 (build 19.0.1+10, mixed mode, sharing)
JAVA_HOME is an important environment variable and it’s important to get it right. Here is a trick that allows me to keep the environment variable current, even after a Java Update was installed. In ~/.zshenv, I set the variable like so:
Open a new terminal and verify:
echo $JAVA_HOME /Library/Java/JavaVirtualMachines/temurin-19.jdk/Contents/Home
The source code of the Java Platform, Standard Edition 11 Reference Implementations binaries is available under the GPLv2 in a single zip file.
The API Specification of the Java Platform, Standard Edition and Java Development Kit
can be found here: