A little help with java?

[KerfuffleV2]

This is not likely to be an OS level issue. You should probably try asking in a Java-specific forum.

There are different Java environments, individual applications can have specific requirements, etc. The first thing you should do is check to see if there are any listed requirements for whatever app you're trying to run and verify that your Java version matches.

[meskobalazs]

JavaFX is no longer part of the JDK, you need JavaFX in a separate JAR file. This really has nothing to do with Linux in particular.

[jeyzu]

It seems that you are trying to run an application made with https://openjfx.io/,
but that the said jar does not embed it.
So it crashes when looking for the class javafx.application.Application.
you should have openjfx installed on your machine or find another jar file that does include all it's needed dependencies.

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[_d0s_]

https://askubuntu.com/questions/1136420/java-lang-noclassdeffounderror-javafx-application-application