OpenJDK on RHEL9 Version: openjdk version: (We have three versions for you to choose from: 1.8, 11, and 17) How to use: To use Openjdk, run the command 'java'. OpenJDK (Open Java Development Kit) is a free and open-source implementation of the ​Java SE (Standard Edition) Platform, providing a fully functional and highly compatible development environment for Java applications. As the reference implementation of Java, OpenJDK is maintained by the ​OpenJDK community under the guidance of Oracle and other major contributors, ensuring adherence to Java specifications and continuous improvements.