How to Install Java 17 in Ubuntu 20.04?

To install Java 17 on Ubuntu 20.04, you can use the OpenJDK package which is available from the default repositories. Here’s a step-by-step guide of “How to Install Java 17 in Ubuntu 20.04?”

1. Update Package Repository:
   First, you need to update the package repository to make sure you have the latest list of available packages.

ubuntu@Rushi-InfoTech:~$ sudo apt-get update

2. Install OpenJDK 17:
   Next, you can install OpenJDK 17 using the following command:

ubuntu@Rushi-InfoTech:~$ sudo apt install openjdk-17-jdk

Please Confirm to install with yes “y“.

3. Verify Installation:
   Once the installation process is complete, you can verify that Java 17 has been successfully installed:

ubuntu@Rushi-InfoTech:~$ java -version

You should see output indicating the version of Java you’ve just installed.

Similarly, you can check the javac version (the Java compiler) with:

ubuntu@Rushi-InfoTech:~$ javac -version

4. Setting Java 17 as the default (if you have multiple Java versions installed):
   If you have more than one version of Java installed, you can set Java 17 as the default using the update-alternatives command.

ubuntu@Rushi-InfoTech:~$ sudo update-alternatives --config java

And for the Java compiler:

ubuntu@Rushi-InfoTech:~$ sudo update-alternatives --config javac

Follow the on-screen prompts to select the version you want as the default.

5. Setting JAVA_HOME:
   It’s a good idea to set the JAVA_HOME environment variable. First, find out the path where Java 17 is installed:

ubuntu@Rushi-InfoTech:~$ readlink -f /usr/bin/java | sed "s:bin/java::"

This will output the path to the Java installation. Now, you can set the JAVA_HOME variable in your shell profile:

ubuntu@Rushi-InfoTech:~$ echo 'export JAVA_HOME=THE_PATH_FROM_ABOVE' >> ~/.bashrc

Make sure to replace THE_PATH_FROM_ABOVE with the actual path you got from the previous command.

After adding this line, you can load the new settings:

ubuntu@Rushi-InfoTech:~$ source ~/.bashrc

Now, Java 17 should be successfully installed and configured on your Ubuntu 20.04 system!

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