How to Install
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2. Downloading OpenJDK 21
Download OpenJDK 21 GNU/Linux Package
If you don’t see the Current Release, just access the Latest one and then on the Left Sidebar you should find it.
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3. Installing OpenJDK 21
Now to Install OpenJDK 21 for Debian
Simply play:sudo tar xvzf ~/Downloads/openjdk-21*.tar.gz -C /usr/lib/jvm/
But if yuo are in Trouble to Find it out on Terminal then See: How to Access Downloads Folder from Browser.
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4. Setting Up Java
Next to Set Up Oracle java OpenJDK 21
You can directly Copy & Paste the Commands into Terminal..sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-21*/bin/java 1165
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-21*/bin/javac 1165
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-21*/bin/jar 1165
sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk-21*/bin/javaws 1165
Checking or Setting the System Java Version in Use with
sudo update-alternatives --config java
And for the Java Compiler instead:
sudo update-alternatives --config javac
To Switch of Java Version Just Enter the Selection Number on First, Column. :)
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5. Setting Up Env
(Optional) Setting JAVA_HOME User Environment Variable
And Edit the Bash environment Configuration filenano $HOME/.bashrc
Append:
export JAVA_HOME=/usr/lib/jvm/jdk-21[Release]
Replace [Release] with the actual one on the above Command.
Possibly to Check the JDK 21 exact PATH use in another window:ls /usr/lib/jvm/
Ctr+x to Save & Exit from nano Editor :)
Next to Load the New Bash Environment:bash
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Finally, Test New Java JDK 21 Installation
java -version
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