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How to Install OpenJDK 21 on Kali Linux – Step-by-step

April 16, 2025 | By the+gnu+linux+evangelist.

How to Install

  1. 2. Updating System

    Now it’s recommended to Update System
    With:

    sudo apt update && sudo apt upgrade

    And in case of a New Kernel setup then to Reboot:

    sudo reboot

  2. 3. Installing OpenJDK 21

    Then to Install OpenJDK 21 in KDE Kali
    First, to look up all the available flavors play:

    apt search openjdk-23

    So next for OpenJDK JDK 21 issue:

    sudo apt install openjdk-23-jdk

    Where for the Java Runtime instead:

    sudo apt install openjdk-23-jre

    Authenticate with the User Admin Pass.
    If Got “User is Not in Sudoers file” then see: How to Enable sudo
    Now to Check the current Java:

    java -version

    And in output you find it:

    Java Version

    Finally, to check for available Java releases:

    apt search openjdk | grep jdk

  3. 4. Managing Java Versions

    So now to Manage Multiple Java on System
    Use the update-alternatives as:

    sudo update-alternatives --config java

    If more than one then choose the wanted Release from list:

    Update Alternatives

    And in case of a JDK Setup you may also switch the Java Compiler with:

    sudo update-alternatives --config javac

    4. Java IDEs Installation on Linux

    Eclipse IDE: Installing Eclipse IDE for Java on Linux.

    Netbeans IDE: Installing NetBeans IDE for Java on Linux.

    IntelliJ IDEA: Installing IntelliJ IDEA for Java on Linux.

    So Now I’m truly Happy if My Guide could Help You to Quick-Start with OpenJDK 21 on Kali Linux!

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