Could not find or load main class ISOViewer

[SulfredLee]

I am using ubuntu 18.04

java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-8u212-b03-0ubuntu1.18.04.1-b03)
OpenJDK 64-Bit Server VM (build 25.212-b03, mixed mode)

When I run
java -jar isoviewer-2.0.2-jfx.jar
I get
Error: Could not find or load main class ISOViewer

I see other issue talking about the version of the java make this problem. But I am using java 8 already.
https://github.com/sannies/isoviewer/issues/5
https://github.com/sannies/isoviewer/issues/15

I am not very familiar with the version control of the java, so how can I run isoviewer?

Thank you very much.

[jurisbu]

Yeah, this is a bit annoying that there are no instruction how to actually run this fine application! Would be great to have some "grandma" instructions.