Forge not launching (K)Ubuntu 18

[Wouter]

Hello,

 

I just tried running minecraft on my Linux machine. It runs Kubutu 19.04.1 LTS. Normal minecraft launches just fine. But when I install forge the game does not launch.

The only log I can get is my launcher_log.txt. 

 

I can see some errors about GLXBadWindow. I dont get these when I launch normal minecraft (1.12).

 

Does anyone know a fix?

Greetings,

Wouter

 

 

Versions:

• Forge: forge-1.12.2-14.23.5.2768
• Linux: Kubuntu 19.04.1 LTS

System:

• I7-7700HQ
• GTX 1050ti (using Nvidia-396)
• Session: X
• DisplayManager: KDE Plasma
• Status: Up to date.

 

Quote

To recreate this issue. Try running Minecraft this the new minecraft launcher (from the Minecraft.deb install package) and install forge 1.12.2 Rec. [Also does this on the old minecraft.jar launcher]

 

launcher_log.txt

[Wouter]

The big error is:

[1019/123010:INFO:ClientHandler.cpp(155)] Hiding launcher!

[1019/123010:WARNING:x11_util.cc(1404)] X error received: serial 174, error_code 3 (BadWindow (invalid Window parameter)), request_code 4, minor_code 0 (X_DestroyWindow)
[1019/123010:INFO:GameCallbacks.cpp(199)] game/game () info Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader

[1019/123010:INFO:GameCallbacks.cpp(199)] game/game () info at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)

[1019/123010:INFO:GameCallbacks.cpp(199)] game/game () info at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[1019/123010:INFO:GameCallbacks.cpp(199)] launcher/monitor (Process Monitor) fatal Process crashed with exit code 1

 

[quadraxis]

Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader

 

Java 9+ is not currently supported, you need to use Java 8.

Edited October 19, 2018 by quadraxis
formatting

[Wouter]

That did the trick. Thanks!