When I try to run the forge server jar in the command line, I get this error message:

schoolbusesc2@server:~/Documents/Minecraft Server$ java -jar forge-1.12.2-14.23.5.2847-universal.jar
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:566)
        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: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
        at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        ... 6 more

I have tried reinstalling, but still same message.

Edited April 6, 20205 yr by SchoolBusesC2

1.12 is no longer supported on these forums due to age.

Please update to a modern version to receive support here.

 

More information on supported versions can be found in the LTS link at the top of every page.

Quote

1.12 is no longer supported on these forums due to age.

Please update to a modern version to receive support here.

The problem is that some of my mods only go up to 1.12.2. So I have to use this version, but it is not working.

Edited April 6, 20205 yr by SchoolBusesC2

7 minutes ago, SchoolBusesC2 said:

The problem is that some of my mods only go up to 1.12.2. So I have to use this version, but it is not working.

I was just letting you know.

Once a moderator sees this topic, it will be locked, I just saved them the effort of explaining why.