Forge Server start.command problems

[philosodog]

Greetings- 

I'm attempting to run a forge server on my old mac (An Intel IMac I have booted with High Sierra 10.13.6), and i'm running into a few problems. I understand that to allocate more ram to the forge.jar, I must use a start.command file. This is the start.command I'm using:

#!/bin/bash
cd "$(dirname "$0")"
exec java -Xms12G -Xmx12G -jar forge-1.12.2-14.23.5.2838-universal.jar

Double-clicking, I am met with this gargantuan error:

 

Last login: Sun Aug  4 16:03:25 on console

william-Mac-Pro:~ william$ /Users/william/Desktop/girth/start.command ; exit;

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:567)

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.(Launch.java:34)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

... 6 more

logout

Saving session...

...copying shared history...

...saving history...truncating history files...

...completed.

 

[Process completed]

 

I have 16 GB of DDR3 RAM, 12GB of which is allocated through the start.command.
I am using Java Version 8, Update 221. 
If anybody needs more information, feel free to ask.

[philosodog]

  On 8/4/2019 at 10:33 PM, diesieben07 said:

You are not.

Expand  

Is there anything at all you can point me towards? I easily uninstalled the java, and installed an earlier Java 7. It failed with largely the same error message.

[appjackstudio]

  On 8/4/2019 at 11:06 PM, philosodog said:

Is there anything at all you can point me towards? I easily uninstalled the java, and installed an earlier Java 7. It failed with largely the same error message.

Expand  

Can you post the output of the "java -version" command?

[philosodog]

williams-Mac-Pro:~ william$ /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version java version "1.8.0_221" Java(TM) SE Runtime Environment (build 1.8.0_221-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode) I reinstalled an archived java 7 version, tried to run it and it didn't work, so I updated. I could try going back to that same java 7, and giving you the version?

[Carl3668]

How did you change your java version?

When I install Java 8 and put java -version in the terminal it says the version is 14...
I think I should uninstall Java 14 before installing Java 8 but I’m not sure and I don’t know how to uninstall Java 14

Edited April 8, 2020 by Carl3668

[DaemonUmbra]

You should be able to uninstall it like any app.

Also this thread is slightly old, please make your own thread next time.