How to Install Oracle JDK on Ubuntu 24.04

Installing Oracle JDK on Ubuntu 24.04 ensures you have the latest, officially supported Java Development Kit for developing and running Java applications. This guide walks you through the necessary steps to install Oracle JDK smoothly, whether you’re setting up a development environment or deploying Java-based software. Before starting, ensure your system is up to date and that you have administrative privileges to install software.

What You’ll Need

• Ubuntu 24.04 installed and running
• Internet connection to download packages
• Terminal access with sudo privileges

Step-by-Step

1. Open your terminal. You can do this by pressing Ctrl+Alt+T or searching for “Terminal” in your application menu.
2. Update your package index to ensure you have the latest information about available packages:

   sudo apt update

3. Install necessary packages for adding new repositories and HTTPS support:

   sudo apt install wget gnupg software-properties-common -y

4. Download the Oracle JDK RPM package from the official Oracle website. Visit https://www.oracle.com/java/technologies/javase-jdk11-downloads.html, select the latest version, and copy the download link for the Linux x64 tar.gz package.
5. Use wget to download the JDK package. Replace the URL below with the actual link you copied:

   wget --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" "YOUR_DOWNLOAD_URL" -O oracle-jdk.tar.gz

   This command bypasses Oracle’s license agreement prompt and downloads the file directly.

6. Create a directory to extract the JDK files:

   sudo mkdir -p /usr/lib/jvm

7. Extract the downloaded archive into the JVM directory:

   sudo tar -xzf oracle-jdk.tar.gz -C /usr/lib/jvm

8. Rename the extracted folder for easier reference. Replace “jdk-version” with the actual folder name:

   sudo mv /usr/lib/jvm/jdk- /usr/lib/jvm/oracle-jdk

9. Set Oracle JDK as the default Java runtime environment:

   sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/oracle-jdk/bin/java 1
   sudo update-alternatives --config java

   Select the Oracle JDK from the list if prompted.

10. Verify the installation by checking the Java version:

    java -version

    You should see the Oracle JDK version details displayed.

11. Additionally, set javac (Java compiler) as default:

    sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/oracle-jdk/bin/javac 1
    sudo update-alternatives --config javac

12. Confirm javac version:

    javac -version

Common Mistakes

• Not accepting the Oracle license agreement during download, resulting in a failed download.
• Incorrect URL or not replacing “YOUR_DOWNLOAD_URL” with the actual download link.
• Extracting the archive to the wrong directory, causing Java not to be found in expected locations.
• Failing to update alternatives, leading to system default still pointing to an older Java version.
• Forgetting to verify the installation with ‘java -version’ to ensure the correct version is active.

Tips

• Always download the latest JDK version for security and performance improvements.
• Keep your system updated regularly to avoid compatibility issues.
• Use ‘update-alternatives’ to manage multiple Java versions seamlessly.
• If you encounter permission issues, prepend commands with sudo.
• Consider setting environment variables like JAVA_HOME for easier Java management.

Troubleshooting

If the installation does not go as planned, here are some common issues and solutions:

• Download fails or license prompt not accepted: Ensure you include the header –header “Cookie: oraclelicense=accept-securebackup-cookie” in your wget command. This bypasses the license agreement.
• Java version not updating: Run ‘sudo update-alternatives –config java’ and select the Oracle JDK manually. Confirm with ‘java -version’ afterward.
• Extraction errors: Verify the downloaded archive is complete and not corrupted. Re-download if necessary.
• Java commands not recognized: Ensure ‘/usr/bin’ is in your PATH and that alternatives are correctly configured.
• System still uses an older Java: Remove or disable the old Java versions from update-alternatives.

Frequently Asked Questions

1. Do I need to uninstall OpenJDK before installing Oracle JDK?

It’s recommended to remove existing OpenJDK versions to avoid conflicts, especially if you want to ensure only Oracle JDK is used. Use ‘sudo apt remove openjdk-*’ to uninstall.

2. How do I keep Oracle JDK updated on Ubuntu?

Oracle does not provide automatic updates for their JDK. You need to manually download and replace the JDK files or consider using OpenJDK for easier updates via apt.

3. Can I install multiple Java versions simultaneously?

Yes, using ‘update-alternatives’ allows you to install and switch between multiple Java versions effortlessly.

4. How do I verify that Java is installed correctly?

Run ‘java -version’ and ‘javac -version’ in the terminal. The output should display the Oracle JDK version you installed.

5. Is Oracle JDK free for commercial use?

Starting from Java SE 11, Oracle JDK is free for personal and development use, but commercial licensing may require a subscription. Check Oracle’s licensing terms for details.

6. What should I do if Java applications do not run after installation?

Ensure the correct Java version is active using ‘update-alternatives’ and verify JAVA_HOME environment variable points to the Oracle JDK directory.

Following these steps carefully will help you successfully install Oracle JDK on Ubuntu 24.04, enabling you to develop and run Java applications with confidence and stability. Remember to keep your system updated and periodically check for new JDK releases to ensure optimal security and performance.

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