Forge doesn't work in 1.12.2

[KillsT3aler69]

Describe the problem

The image crashes when you try to run forge in 1.12.2.

Container definition

docker run -it
-p 25565:25565
-e EULA=TRUE
-e TYPE=FORGE
-e VERSION=1.12.2
itzg/minecraft-server

Container logs

[init] Running as uid=1000 gid=1000 with /data as 'drwxrwxr-x 2 1000 1000 4096 Aug 3 18:19 /data'
[init] Resolving type given FORGE
[mc-image-helper] 14:26:31.979 INFO : Downloading Forge installer 14.23.5.2859 for Minecraft 1.12.2
[mc-image-helper] 14:26:33.257 INFO : Running Forge installer. This might take a while...
[init] Creating server properties in /data/server.properties
[init] Disabling whitelist functionality
[init] Setting initial memory to 1G and max to 1G
[init] Starting the Minecraft server...
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(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
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
2023-08-05T14:26:45.332Z WARN mc-server-runner Minecraft server failed. Inspect logs above for errors that indicate cause. DO NOT report this line as an error. {"exitCode": 1}
2023-08-05T14:26:45.332Z INFO mc-server-runner Done

[itzg]

Java 8 is indeed required. Refer to https://docker-minecraft-server.readthedocs.io/en/latest/versions/java/#running-minecraft-server-on-different-java-version

[KillsT3aler69]

This did indeed fix the issue, thanks!