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 ...

The problem is that path is in fact URI, i.e. something like file:/..., but java.nio.file.Path does not expect URI. It probably does not work correctly also on Linux but there is no exception since ": ...

I'm guessing that, when launching the program through the batch file, the current working directory is now the jar file directory (which coincidently is what I want), so using a relative path to ...