(Ubuntu) InvocationTargetException, version 1.12.2/2768

[leetleek]

Hello,

 

Upon starting the Forge universal jar, I get the following message:

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
Caused by: java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
	at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	... 6 more

 

Here's what I have tried:

• minecraft_server.1.12.2.jar is present in the same directory as the Forge universal jar
• I did run minecraft_server.1.12.2.jar twice (first time to generate & accept EULA file), successfully
• Installed the latest default-jre and default-jdk packages from apt

 

I am attempting to run Forge version 14.23.5.2768 for Minecraft 1.12.2, on Ubuntu 18.04 LTS.

Any help is greatly appreciated.

[leetleek]

18 minutes ago, diesieben07 said:

Forge only works with Java 8 for 1.12.2 and older.

Thank you so much, I don't know how I missed that.