Java is a powerful programming language that enables users to create a wide range of applications, such as building games, creating web applications, and designing embedded systems. Debian 12 is a powerful newly released Linux-based operating system that provides a stable and reliable foundation for Java applications to thrive. Together with Java and Debian systems you can open up a world of possibilities and innovations that can definitely help people a lot. This is only possible if Java is installed on your Debian system.
In this guide you will learn about:
How to install Java on Debian 12
How to install and use multiple Java versions on Debian 12
How to update Java on Debian 12
Bonus Method: How to Install Other Java Versions on Debian 12
in conclusion
You can install Java on Debian 12:
Previous Debian source libraries included various Java versions, such as Java 8, Java 11, Java 17, Java 18 and Java 19. However, the latest Debian 12 source repositories exclude other Java versions except Java 17. Therefore, you will be able to install Java 17 on Debian 12 only through the apt command by following these steps:
Because you are installing Java from the Debian repository, you must first ensure that it is updated, which can be done with the following command:
Sudo apt update&sudo apt upgrade-y
After the update, you can install Java on Debian 12 through the command given below:
sudo apt install openjdk—17—jdk
Or you can use the following command to install Java 17 on Debian
sudo apt install default—jdk
To check if Java is installed correctly on Debian you can use the following command:
javac version
If you want to remove a specific version of Java installed from the APT package manager, just use the following syntax:
Sudo apt delete Java_Version-y
Note: Don’t forget to replace java_version with the version installed on your Debian system by the apt package manager.
Java officially provides deb package files, making installation very simple. You can download any version of Java and install it on Debian using the apt command.
If you are interested in installing the latest version of Java on Debian 12 from the Deb package, please follow these steps:
First, you need to download the Java deb package required for Debian from the official website. If you want to download Java directly from the terminal, you can simply use the following command:
www.example.com
After downloading the deb package, you can use the apt installation command to install the latest version of Java on Debian:
Sudo apt installation ./jdk-21_linux-x64_bin.deb
To verify that the latest version of Java is installed on Debian, you can execute the following command:
javac version
If you have installed Java on Debian 12 via deb file and want to remove it from the system, you can use apt command to remove this version from the system. However, you must ensure that you install the version on Debian via the deb package.
Since I already have Java 21 installed on Debian, the following command will be used to remove it from the system:
sudo apt remove jdk—21
In addition to installing Java from the Debian source repositories or tar.gz files, you can also install Java on Debian 12 using a third-party application called SDKMAN. Specific steps are as follows:
Make sure you have cURL and Zip installed on Debian, if not, you can install both on your system by executing the following command:
Sudo apt install curl compressed package
You can then execute the following script in the Debian terminal to download and install SDKMAN on your system:
Curl-S "https://get.sdkman.io"|BASH
To complete the installation of SDKMAN on Debian 12, you must run the "browser" command that appears immediately after executing the above command:
/home/username/.sdkman/bin/www.example.com
Note: The username in the above command will be different in your scenario.
You can confirm whether SDKMAN is successfully installed on Debian by running the following version command:
sdk version
To see a list of Java versions that can be installed on Debian 12 via SDKMAN, you can run the following command:
sdk list java
It will provide you with a list of different Java versions, vendors and identifiers. Here, you care about identifiers. Select your supplier and note the supplier's identifier. Then use the "q" button to exit the list:
Then you can install Java on Debian 12 rom SDKMAN using the following command:
sdk install java identifier
Here I am installing Java 19 on Debian from SDKMAN:
To ensure that the Java installed from SDKMAN is the default Java version on Debian, you can run the following command to confirm:
javac version
You cannot remove Java on Debian 12 directly from SDKMAN as it does not allow the default Java version to be uninstalled from the system. To remove Java on Debian, you must set a different Java version as the default version, which can be done with the following command:
Sdkman uses Java identifiers
Or use the UPDATE_Alternative method to switch to another Java version on Debian. Once this is done, you can remove the Java installation on Debian from SDKMAN using the following command:
SDK Uninstall Java 19-AMZN
Some applications require a specific Java version to be installed on your system. In this case, removing the current version of Java on the system is not an ideal option. Don't worry, you can use the following steps to use any Java version on your system without removing the previous steps:
Before using another Java version on Debian, you must confirm the current Java version you are using on your system, this can be done with the following command:
javac version
Now you have to select the default Java executable on Debian from the list of Java versions currently installed on your system. You can do this through the command given below:
Sudo Update – Alternative – Configure javac
You must select the Java version to use on your system, keep the current Java version by entering the selection number:
After completion, use the VERSION command again to confirm that the Java version on Debian has been updated:
javac version
Tip: If you fail to remove Java from your Debian system, first try switching to another Java version before trying to remove it.
If there is a new update for Java, you can reinstall it by downloading the updated Deb file, targ.gz file or installing Java from SDKMAN. Then use the step-by-step guidance provided in the UPDATE-Alternative method of this guide to update Java on Debian.
If you are using an older Debian version and are interested in installing another Java version from APT, you can simply specify the Java version in place of VERSION_NO:
sudo apt install openjdk—version_no—jdk
Installing Java on Debian 12 will allow you to develop applications, games or design embedded systems. You can install Java on Debian directly from the apt package manager. However, this method will only install the Java 17 version on your system. To install the latest Java version on Debian 12, you have to download the tar.gz file from the official Java website. Then follow the step-by-step instructions provided in this guide to install Java on Debian. You can also install the SDKMAN tool on Debian so that you can easily install any Java version on your system. The choice of Java installation method depends on your needs, so choose the method wisely and start using Java on Debian system.
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