Get Started with OpenJDK on Red Hat OpenShift and RHEL

Introduction

Java is one of the most popular and widely used programming languages in the world. It allows developers to create applications that can run on different platforms and devices, from desktops and servers to mobile phones and embedded systems. However, to run Java applications, you need a Java Development Kit (JDK) and a Java Runtime Environment (JRE).

A JDK is a software development environment that contains the tools and libraries needed to compile, debug, and run Java applications. A JRE is a software package that contains the components needed to execute Java applications, such as the Java Virtual Machine (JVM) and the core class libraries. A JDK includes a JRE, but a JRE does not include a JDK.

download openjdk red hat

There are many implementations of the JDK and JRE available in the market, but the most widely used ones are Oracle JDK and OpenJDK. Oracle JDK is the official implementation of the Java SE platform by Oracle Corporation, which acquired Sun Microsystems, the original creator of Java, in 2010. OpenJDK is an open source implementation of the Java SE platform that is sponsored and led by Oracle, but also involves other contributors from the Java community.

Red Hat build of OpenJDK is a free and open source distribution of OpenJDK that is supported by Red Hat, one of the leading providers of enterprise open source solutions. Red Hat build of OpenJDK is available for Red Hat Enterprise Linux (RHEL), Windows, and other Linux environments as a JRE and a complete JDK. It is also shipped as a JDK and JRE in many containers in the Red Hat Container Catalog.

In this article, we will explain how to download and install Red Hat build of OpenJDK, what are the benefits and differences of using it compared to Oracle JDK, and what are some common issues that you might encounter. By the end of this article, you will have a better understanding of OpenJDK Red Hat and how to use it for your Java development needs.

Downloading OpenJDK Red Hat

To download OpenJDK Red Hat, you need to visit the for OpenJDK Red Hat.

On the download page, you can choose from three versions of OpenJDK Red Hat: 8u, 11u, and 17u. These versions correspond to the major releases of Java SE: 8, 11, and 17. Each version has different features and support policies, so you should choose the one that suits your requirements best.

For each version, you can download either a ZIP or an MSI file for Windows, or a TAR.XZ file for Linux. You can also download a ZIP file containing the source code for each version. Additionally, you can download container images for OpenJDK Red Hat from the .

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The following table shows the latest release dates and file sizes for each version of OpenJDK Red Hat:

VersionRelease dateFile size (Windows ZIP)File size (Linux TAR.XZ)

OpenJDK 8u372April 20, 2023171 MB97 MB

OpenJDK 11u13April 20, 2023193 MB108 MB

OpenJDK 17u0September 14, 2022198 MB112 MB

Installing OpenJDK Red Hat

After you have downloaded the file for your desired version and platform of OpenJDK Red Hat, you can proceed to install it on your system. The installation process may vary depending on the file type and the operating system you are using.

Installing OpenJDK Red Hat on Windows

If you have downloaded the ZIP file for Windows, you can simply extract it to any location on your system. You can use any file compression tool, such as WinZip or 7-Zip, to unzip the file. Alternatively, you can right-click on the file and select "Extract All" from the context menu.

After extracting the file, you will see a folder named "jdk--windows-x64". Inside this folder, you will find the bin, conf, include, jmods, legal, and lib subfolders that contain the OpenJDK Red Hat files. You can move this folder to any location on your system, such as C:\Program Files\Java.

To use OpenJDK Red Hat as your default JDK and JRE on Windows, you need to set the JAVA_HOME and PATH environment variables. The JAVA_HOME variable should point to the location of the OpenJDK Red Hat folder, such as C:\Program Files\Java\jdk--windows-x64. The PATH variable should include the bin subfolder of the OpenJDK Red Hat folder, such as C:\Program Files\Java\jdk--windows-x64\bin.

You can set these environment variables by following these steps:

• Open the Control Panel and click on System and Security.

• Click on System and then click on Advanced system settings.

• Click on Environment Variables in the System Properties window.

• In the User variables section, click on New to create a new variable.

• Type JAVA_HOME in the Variable name field and type the location of the OpenJDK Red Hat folder in the Variable value field. Click OK to save the variable.

• In the User variables section, select the PATH variable and click on Edit.

• Click on New and type the location of the bin subfolder of the OpenJDK Red Hat folder. Click OK to save the changes.

• Click OK to close the Environment Variables window and click OK to close the System Properties window.

If you have downloaded the MSI file for Windows, you can simply double-click on it to launch the installer. The installer will guide you through the installation process and allow you to choose the installation directory and options. The installer will also set the JAVA_HOME and PATH environment variables for you automatically.

Installing OpenJDK Red Hat on Linux

If you have downloaded the TAR.XZ file for Linux, you can extract it to any location on your system using a command-line tool such as tar or xz. For example, you can use the following command to extract the file to /opt/java:

$ sudo tar -xvf jdk--linux-x64.tar.xz -C /opt/java

After extracting the file, you will see a folder named "jdk--linux-x64". Inside this folder, you will find the bin, conf, include, jmods, legal, and lib subfolders that contain the OpenJDK Red Hat files. You can move this folder to any location on your system, such as /usr/lib/jvm.

To use OpenJDK Red Hat as your default JDK and JRE on Linux, you need to set the JAVA_HOME and PATH environment variables. The JAVA_HOME variable should point to the location of the OpenJDK Red Hat folder, such as /usr/lib/jvm/jdk--linux-x64. The PATH variable should include the bin subfolder of the OpenJDK Red Hat folder, such as /usr/lib/jvm/jdk--linux-x64/bin.

You can set these environment variables by editing your shell configuration file, such as /.bashrc or /.profile. You can use any text editor, such as nano or vi, to edit these files. For example, you can add these lines to your /.bashrc file: export JAVA_HOME=/usr/lib/jvm/jdk--linux-x64 export PATH=$PATH:$JAVA_HOME/bin

After editing the file, you need to source it or restart your shell for the changes to take effect. You can use the following command to source the file:

$ source /.bashrc

Benefits of OpenJDK Red Hat

There are many benefits of using OpenJDK Red Hat over Oracle JDK, especially for enterprise users and developers. Some of these benefits are:</