Application will not launch in OpenJDK (but not Oracle JDK)

[LordBurtz]

When I try to start the application with ´java -jar 'Lazer_exporter.jar'´ i get the error:
Error: Could not find or load main class com.ringosham.Main Caused by: java.lang.NoClassDefFoundError: javafx/application/Application
I tried putting the .jar in the main directory (git cloned that), putting it into src/ and all src/* directories..
Sorry for the inconvenience but I dont know how to use that jar

[ringosham]

Please use Java 8. It will not run on anything higher.
You can check you Java version by java -version

[LordBurtz]

Sorry to reopen this rather stupid question -but I cant get this to work...
Command: java -jar Lazer_exporter.jar
Error: Error: Could not find or load main class com.ringosham.Main
java version: openjdk version "1.8.0_292" OpenJDK Runtime Environment (build 1.8.0_292-b10) OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)
archlinux-java get: java-8-openjdk

I decompiled your release 1.6 and it looks fine.. the Main class is correctly specified idk why this happens

[ringosham]

Sorry but I cannot reproduce your issue.
Something must have gone wrong with your Java installation.

My Java version:

java version "1.8.0_301"
Java(TM) SE Runtime Environment (build 1.8.0_301-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.301-b09, mixed mode)

[danbulant]

I have the same problem on Manjaro

❯ java -version
openjdk version "16.0.2" 2021-07-20
OpenJDK Runtime Environment (build 16.0.2+7)
OpenJDK 64-Bit Server VM (build 16.0.2+7, mixed mode)

Other java applications (minecraft, lavalink) work just fine.

[danbulant]

However, using the java JRE 1.8 by oracle (not the OpenJDK version) works. Those aren't available in linux repos as they're proprietary though (and snap install doesn't work).

[ringosham]

Ah so this must have been Oracles fault (or maybe the team in OpenJDK).
I'll see what can be done.

[ringosham]

It turns out that OpenJDK 8 does not include JavaFX (The graphical frontend) in its dependency (and all later versions of OpenJDK as well)

On Linux, this can be solved by installing openjfx
See https://stackoverflow.com/questions/63842928/openjdk8-and-javafx-on-macos for macOS