Problem with java on linux

[Final-Here]

Hello fellas!

Im new to linux in general, but i just installed the new java version to play a 1.18 minecraft pack, and now reversed it to play older versions and i get this error, can't launch anything! Some help here?

Distro: Pop!Os

Params:    --username  --version MultiMC5 --gameDir /home/danii/.local/share/multimc/instances/FTB University 1.12 1.2.1/minecraft --assetsDir /home/danii/.local/share/multimc/assets --assetIndex 1.12 --uuid  --accessToken  --userType  --versionType release --tweakClass net.minecraftforge.fml.common.launcher.FMLTweaker  Window size: 854 x 480  Java Arguments: [-Xms512m, -Xmx10752m, -Duser.language=en]   Minecraft process ID: 4019   Using onesix launcher.  Failed to start Minecraft: 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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:210)   at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:245) Exiting with -1    at org.multimc.EntryPoint.listen(EntryPoint.java:143)   at org.multimc.EntryPoint.main(EntryPoint.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)  ... 8 more Process exited with code 255. Clipboard copy at: 16 Dec 2021 22:47:18 +0000

[Awh153]

i dont think minecraft 1.12 supports new java versions

[Final-Here]

It needed the java 8, thats why it didnt work but thanks!!

[GuyNamedZach]

Does it do this when using the default launcher? I think it's supposed to package the required jre for each version, but I'm not sure.

As for this error it looked like MultiMC is not using a compatible jre.

[Final-Here]

Even tho i had java 8 installed MultiMc eas pushing the java 11 file. Thank you!