I am unable to launch modded Minecraft using the latest Minecraft Launcher with Java 10. I am reporting this bug in the Mojang Bug Tracker because it has something to do with the Minecraft Launch Wrapper.
Here's the last line in the launcher_log.txt:
[0614/144307:INFO:GameCallbacks.cpp(178)] launcher/launcher (main) info Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader[0614/144307:INFO:GameCallbacks.cpp(178)] launcher/launcher (main) info Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoaderat net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Steps to reproduce
Install any modification for Minecraft (OptiFine for example)
:info: Note that the bug here is the Minecraft Launch Wrapper, which is a Minecraft library, and not the modification.
Attachments
Comments 8
This ticket is invalid as it relates to a modified or 3rd party client, server, or launcher.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
This site is for addressing issues related to the base unmodded Minecraft; Bukkit, Forge, Optifine, modded servers such as The Hive, Overcast, Showbot, Hypixel or any other modded system invalidates your ticket, unless the behavior can be reproduced in Vanilla.
Additionally, if you have problems on large-scale modded servers, please report it to their site. It's probably not a bug in Vanilla Minecraft.
@unknown, the bug here is the Minecraft Launch Wrapper, not the modification. Note that Minecraft Launch Wrapper is a Minecraft library.
Java 10 will soon take over Java 8, so if this bug won't get fixed, mods will not be able to be played.
(Take note of at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34))
What if the vanilla Minecraft is bugged so that it can no longer compatible with mods? The mods don't get wrong; the part relevant to be compatible with mods in vanilla Minecraft does.
@unknown, Java 8 works fine in launching modded Minecraft; Java 10 will fail to load any modded Minecraft.
What, Java 10 is already out??
Also your Minecraft is modded so... if the vanilla version works fine , then probably you should ask the mod developers for help?