OpenJDK Runtime Environment (build 11.0.5-ea + 6-post-Debian-2) To check if java is installed open a terminal, type the following command, and check what came back: root kali-elena: ~ # java -version The first time you execute it will ask you to accept the license agreement.Īs we said, it is necessary to install java on the Linux machine. Once the installation is complete you will be able to find it in the Programs.