Here are the three easiest ways to fix Java’s “not recognized as an internal or external command” error: Install or reinstall Java and the JDK on your computer Add Java’s bin directory to the computer ...

To install Java 17, open a terminal window and issue this command: sudo apt-get install openjdk-17-jdk openjdk-17-jre -y. After that installation completes, let’s install Java 18 with this command: ...