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OpenJDK 12 Installation Guide: How to Download and Set Up Java SE


How to Download OpenJDK 12 for Your Operating System




OpenJDK is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). It is the official reference implementation of Java SE since version 7. OpenJDK is widely used by developers and enterprises around the world for developing and running Java applications.


OpenJDK 12 is the latest release of OpenJDK as of March 2019. It contains many new features and enhancements, such as switch expressions, raw string literals, dynamic class-file constants, default CDS archives, low-pause-time garbage collector, microbenchmark suite, and more. You can find the full list of changes in the release notes.




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In this article, we will show you how to download and install OpenJDK 12 for different operating systems, such as Windows, Linux, and MacOS. We will also show you how to verify the installation and check the version of OpenJDK 12 on your system.


How to Download OpenJDK 12 for Windows




There are two ways to download OpenJDK 12 for Windows: using ZIP or MSI packages, or using Windows Package Manager.


Using ZIP or MSI Packages




You can download ZIP or MSI packages from OpenJDK website. The ZIP package contains a compressed folder with all the files needed to run OpenJDK 12. The MSI package is an installer that will automatically set up OpenJDK 12 on your system.


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To use the ZIP package, follow these steps:


  • Download the .zip file from OpenJDK website.



  • Extract the .zip file to a folder of your choice.



  • Set the JAVA_HOME environment variable to point to that folder.



  • Add the bin subfolder of that folder to your PATH environment variable.



To use the MSI package, follow these steps:


  • Download the .msi file from OpenJDK website.



  • Double-click on the .msi file and follow the instructions on the screen.



  • The installer will automatically set up OpenJDK 12 on your system and update your PATH and JAVA_HOME environment variables.



Using Windows Package Manager




If you have Windows Package Manager installed on your system, you can use it to download and install OpenJDK 12 from your Windows Terminal. Windows Package Manager is a command-line tool that allows you to manage software packages on Windows.


To use Windows Package Manager, follow these steps:


  • Open Windows Terminal.



  • Type winget install openjdk --version=12.0.2 and press Enter.



  • The tool will automatically download and install OpenJDK 12 on your system.



How to Download OpenJDK 12 for Linux




There are two ways to download OpenJDK 12 for Linux: using TAR.GZ packages, or using DEB or RPM packages.


Using TAR.GZ Packages




You can download TAR.GZ packages from OpenJDK website. The TAR.GZ package contains a compressed folder with all the files needed to run OpenJDK 12.


To use the TAR.GZ package, follow these steps:


  • Download the .tar.gz file from OpenJDK website.



  • Extract the .tar.gz file to a folder of your choice.



  • Set the JAVA_HOME environment variable to point to that folder.



  • Add the bin subfolder of that folder to your PATH environment variable.



Using DEB or RPM Packages




You can download DEB or RPM packages from AdoptOpenJDK website. The DEB package is for Debian-based Linux distributions, such as Ubuntu or Mint. The RPM package is for Red Hat-based Linux distributions, such as Fedora or CentOS.


To use the DEB package, follow these steps:


  • Download the .deb file from AdoptOpenJDK website.



  • Open a terminal and navigate to the folder where you downloaded the file.



  • Type sudo dpkg -i openjdk-12*_linux-x64_bin.deb and press Enter.



  • The installer will automatically set up OpenJDK 12 on your system and update your PATH and JAVA_HOME environment variables.



To use the RPM package, follow these steps:


  • Download the .rpm file from AdoptOpenJDK website.



  • Open a terminal and navigate to the folder where you downloaded the file.



  • Type sudo rpm -ivh openjdk-12*_linux-x64_bin.rpm and press Enter.



  • The installer will automatically set up OpenJDK 12 on your system and update your PATH and JAVA_HOME environment variables.



How to Download OpenJDK 12 for MacOS




You can download OpenJDK 12 for MacOS from OpenJDK website. The package contains a compressed folder with all the files needed to run OpenJDK 12.


To use the package, follow these steps:


  • Download the .tar.gz file from OpenJDK website.



  • Extract the .tar.gz file to a folder of your choice.



  • Set the JAVA_HOME environment variable to point to that folder.



  • Add the bin subfolder of that folder to your PATH environment variable.



How to Verify the Installation and Check the Version of OpenJDK 12




To verify that you have successfully installed OpenJDK 12 on your system, you can use the java -version command in your terminal. This will show you the version and build information of your Java runtime environment. For example, you should see something like this:


$ java -version openjdk version "12.0.2" 2019-07-16 OpenJDK Runtime Environment (build 12.0.2+10) OpenJDK 64-Bit Server VM (build 12.0.2+10, mixed mode, sharing)


If you see this output, it means that you have successfully installed OpenJDK 12 on your system and you can start using it for your Java applications.


Conclusion




In this article, we have shown you how to download and install OpenJDK 12 for different operating systems, such as Windows, Linux, and MacOS. We have also shown you how to verify the installation and check the version of OpenJDK 12 on your system.


OpenJDK 12 is a free and open-source implementation of Java SE that contains many new features and enhancements. It is widely used by developers and enterprises around the world for developing and running Java applications. If you want to learn more about OpenJDK 12 and its features, you can visit the official website or read the release notes.


FAQs




What is the difference between Oracle JDK and OpenJDK?




Oracle JDK and OpenJDK are both implementations of Java SE, but they have some differences in terms of licensing, support, and features. Oracle JDK is a commercial product that requires a paid subscription for updates and support after six months of its release. OpenJDK is a free and open-source product that is updated and supported by the community. Oracle JDK also includes some proprietary features that are not available in OpenJDK, such as Java Flight Recorder, Java Mission Control, and ZGC.


How can I switch between different JDK versions on my system?




If you have multiple JDK versions installed on your system, you can switch between them by changing the JAVA_HOME and PATH environment variables. You can also use tools such as jenv or SDKMAN! to manage and switch between different JDK versions more easily.


What are the new features and enhancements in OpenJDK 12?




OpenJDK 12 contains many new features and enhancements, such as:


  • Switch expressions: a new syntax that allows multiple values to be returned from a switch statement.



  • Raw string literals: a new way to write string literals that span multiple lines and do not need escape sequences.



  • Dynamic class-file constants: a new mechanism that allows dynamic languages to generate constants for the Java class file format.



  • Default CDS archives: a feature that improves the startup time of Java applications by creating a default class data-sharing archive.



  • Low-pause-time garbage collector: a new experimental garbage collector that aims to reduce the pause times for applications with large heaps.



  • Microbenchmark suite: a new set of benchmarks that measure the performance of small units of code.



How can I update OpenJDK 12 to the latest version?




You can update OpenJDK 12 to the latest version by downloading and installing the latest package from OpenJDK website or AdoptOpenJDK website. You can also use Windows Package Manager, DEB or RPM packages, or other tools to update OpenJDK 12 automatically.


Where can I find more information and support for OpenJDK?




You can find more information and support for OpenJDK from the following sources:


  • OpenJDK website: the official website of OpenJDK that contains downloads, documentation, mailing lists, bug reports, and more.



  • AdoptOpenJDK website: a community-driven website that provides prebuilt binaries and installers for OpenJDK.



  • OpenJDK Wiki: a wiki that contains useful information and guides for OpenJDK users and developers.



  • Stack Overflow: a popular question-and-answer website where you can ask and answer questions related to OpenJDK.





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