Installing OpenJDK 11 on macOS: A Step-by-Step Guide
Prerequisites
Before we begin, make sure you have the following:
- A Mac with macOS High Sierra or later
- A valid Apple ID and a Mac with a compatible processor (Intel Core i5 or i7)
- A recent version of macOS (10.15 or later)
- Java Development Kit (JDK) 8 or later installed on your system
Step 1: Download and Install the OpenJDK 11 Image
To install OpenJDK 11 on your Mac, you’ll need to download the OpenJDK 11 image from the Oracle website. Here’s how:
- Go to the Oracle website (https://www.oracle.com/java/technologies/javase-downloads.html)
- Click on the "Download" button for macOS
- Select the "OpenJDK 11" image for your system (e.g., macOS High Sierra)
- Choose the correct architecture (32-bit or 64-bit) and download the image
- Save the downloaded file to your desktop
Step 2: Create a New Bootable USB Drive
To install OpenJDK 11 on your Mac, you’ll need to create a new bootable USB drive. Here’s how:
- Open the Disk Utility application on your Mac (you can find it in the Applications/Utilities folder)
- Select the downloaded OpenJDK 11 image file (e.g.,
OpenJDK-11-11.0.4.15.0.1-x86_64.dmg) - Click on the "Create" button
- Choose the "USB Drive" option and select the USB drive you want to use
- Click on the "Create" button
Step 3: Boot from the USB Drive
To boot from the USB drive, you’ll need to restart your Mac and enter the boot options. Here’s how:
- Restart your Mac and immediately hold down the Command (⌘) + R keys
- Select the USB drive from the boot options (it should be listed as a new bootable device)
- Click on the "Boot" button to start the installation process
Step 4: Install OpenJDK 11
Once the installation process starts, you’ll be prompted to select the installation options. Here’s what to do:
- Select the "Install OpenJDK 11" option
- Choose the language and keyboard layout you prefer
- Select the installation location (e.g.,
/Applications/Java/or~/Library/Java/)
Step 5: Configure the Java Development Kit (JDK)
After the installation is complete, you’ll need to configure the JDK. Here’s how:
- Open the Terminal application on your Mac (you can find it in the Applications/Utilities folder)
- Type the following command to update the JDK:
sudo apt-get update - Type the following command to install the JDK:
sudo apt-get install openjdk-11-jdk - Type the following command to configure the JDK:
sudo update-alternatives --install /usr/lib/jvm/java-11-openjdk/jre/lib/jre/libexec/java-11-openjdk 11.0.4.15.0.1 1
Step 6: Verify the Installation
To verify that the installation was successful, you can check the JDK version using the following command:
- Type the following command to check the JDK version:
java -version
Step 7: Install Java Runtime Environment (JRE)
To use the JDK, you’ll also need to install the Java Runtime Environment (JRE). Here’s how:
- Open the Terminal application on your Mac
- Type the following command to install the JRE:
sudo apt-get install openjdk-11-jre
Step 8: Verify the JRE Installation
To verify that the JRE was installed correctly, you can check the JRE version using the following command:
- Type the following command to check the JRE version:
java -version
Troubleshooting Tips
- If you encounter any issues during the installation process, you can try restarting your Mac and trying again.
- If you’re using a virtual machine, make sure that the virtual machine is properly configured and that the JDK is installed on the correct virtual machine.
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If you’re experiencing issues with the JDK or JRE, you can try reinstalling them using the following commands:
- To reinstall the JDK:
sudo apt-get install openjdk-11-jdk - To reinstall the JRE:
sudo apt-get install openjdk-11-jre
Conclusion
Installing OpenJDK 11 on macOS is a straightforward process that requires some basic technical knowledge. By following these steps, you should be able to successfully install OpenJDK 11 on your Mac and use it to develop and run Java applications. Remember to verify the installation by checking the JDK and JRE versions, and to troubleshoot any issues that may arise during the installation process.