Minecraft Forge Server MacOS Problem

[R3VOLVR]

Hi,

I am trying to create a modded Minecraft Forge server so I could play with my friends. I watched every video on how to make a modded Minecraft server using Forge on a Mac and they do not seem to have any problems at all, but unfortunately the terminal can not run the forge jar and is giving me error messages which will be provided below. The reason why I prefer using the terminal instead of the provided Minecraft server jar provided by the official Minecraft website is because the SpongeForge mod disables the GUI as far as I know. But anyways, here are the information:

I am currently using a 2018 Macbook Pro 15.

Specs:

• CPU

  • 2.2 GHz Intel Core i7

• RAM

  • 16GB 2400mHz DDR4

• GPU

  • Radeon Pro 555X 4GB
  • Intel UHD Graphics 630 1536 MB

 

I also installed the recommended Java version - Java 8 Update 221.

 

Here's what's inside my start.command

#!/bin/bash
cd "$(dirname "$0")"
exec java -Xms1G -Xmx1G -jar forge-1.12.2-14.23.5.2838-universal.jar nogui

 

and Here's the log on my terminal when i try to run the start.command:

Last login: Thu Jul 18 00:22:03 on ttys000
Keiths-MacBook-Pro:~ keithphilippe$ /Users/keithphilippe/Desktop/Modded/Server/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.<init>(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 hope someone can help me fix this problem. Thanks in advance.

[uiytt]

okay so can you show us what you have in your server folder ?

[DaemonUmbra]

  On 7/17/2019 at 10:18 PM, uiytt said:

okay so can you show us what you have in your server folder ?

Expand  

This is irrelevant.

 

You need to use Java 8 to launch any pre-1.13 Forge version.

[R3VOLVR]

  On 7/18/2019 at 12:26 AM, DaemonUmbra said:

This is irrelevant.

 

You need to use Java 8 to launch any pre-1.13 Forge version.

Expand  

I already have said above that I recently installed Java 8. Problem still occurs.

[R3VOLVR]

  On 7/18/2019 at 8:50 AM, diesieben07 said:

The log shows you are using Java 9 or above.

Expand  

I do not currently have my laptop with me right now, but yesterday I just checked the Java version on my Mac via the System Preferences and it said that I was using Java 8u221. But if the log said that I am still using Java 9, I'll try to uninstall that version once I can have access to my laptop ASAP and send another update from you guys.

Hopefully this will fix the problem.

Edited July 18, 2019 by R3VOLVR
Spelling

[R3VOLVR]

  On 7/18/2019 at 8:56 AM, R3VOLVR said:

I do not currently have my laptop with me right now, but yesterday I just checked the Java version on my Mac via the System Preferences and it said that I was using Java 8u221. But if the log said that I am still using Java 9, I'll try to uninstall that version once I can have access to my laptop ASAP and send another update from you guys.

Hopefully this will fix the problem.

Expand  

Unfortunately, I do not know how to uninstall Java 9 at the moment, but here's a screenshot of my current version of Java:

[R3VOLVR]

  On 7/18/2019 at 1:28 PM, diesieben07 said:

What matters is that java on the command line is somehow bound to Java 9 (or above).

You can specify the full path to the java executable instead to force Java 8.

Expand  

So I reinstalled Java 8 again and the problem still persists. Is there a way you can help me do what's needed to be done? Do I need to change what's written in the start.command?

[Raelsyl]

  On 7/18/2019 at 8:50 AM, diesieben07 said:

The log shows you are using Java 9 or above.

Expand  

Where does it imply that? Just curious.

[MisterBrums]

Had the same problem. Running macOS Catalina 10.15.6. Installed Java 8 from Oracle's website, as suggested in this post. However, it's true that even after installing java 8, the "java" command still links to the built-in installed java.

 

This can be checked by typing 

java -version

Which outputs : java version "14.0.2" 2020-07-14

 

You can also see where the binary is by typing 

whereis java

Result: /usr/bin/java

 

After a bit of searching, the Java 8 binary, on the Mac, when installed from Oracle, is at:

/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java

 

This is the correct binary, as shown by checking the version:

"/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/./java" -version

Result: java version "1.8.0_261"

 

Here is my working startup script:

#!/bin/bash
cd "$(dirname "$0")"
"/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/./java" -Xms4G -Xmx4G -jar forge-1.12.2-14.23.5.2854.jar

Note that you need to either quote the path or escape the space.

 

Hope it helps

 

[DaemonUmbra]

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Please update to a modern version of Minecraft to receive support.