If you have the Java Runtime Environment installed, and the JAR file is executable, it should open with a double-click. Sometimes, you might see a pop-up to choose which app to run the file.

Steps to run a JAR file on Windows, Mac or Linux To run a JAR file on Windows, Mac or Ubuntu machines, follow these steps: Verify that Java is installed on your computer Confirm the computer’s PATH ...

Right-click an empty spot inside the directory. Click Open in the terminal. Issue the command (including sudo) to open the file with elevated privileges. That’s a bit extra.