Forge and NeoForge installers fail on Minecraft 1.21.1 with UnsupportedClassVersionError
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
调研方向
Start by tracing how the app selects the managed Java runtime and passes it to Forge and NeoForge loader processors; the report names no source files or tests. Compare the required class file version 70 with the runtime's maximum of 65, then check where loader metadata or installer runtime compatibility is determined. Done means Forge 52.1.20 and NeoForge 21.1.265 can install Minecraft 1.21.1 with the supported runtime.
由索引模型根据 Issue 内容生成。
描述
Please confirm the following.
- I checked the existing issues for duplicate problems
- I have tried resolving the issue using the support portal
- I have ensured my Modrinth App installation is up to date
What version of the Modrinth App are you using?
0.22.0
What operating systems are you seeing the problem on?
Windows
Describe the bug
I'm using Modrinth App 0.22.0 on Windows 11. Fabric works normally, but both Forge and NeoForge fail when installing Minecraft 1.21.1, including in clean, newly created instances
java.lang.UnsupportedClassVersionError: net/minecraftforge/installertools/ConsoleTool has been compiled by a more recent version of the Java Runtime (class file version 70.0), this version of the Java Runtime only recognizes class file versions up to 65.0
Java 21 is installed through Modrinth's managed Java installations. Clearing the cache and reinstalling Java 21 did not fix the issue.
Reproduced with:
NeoForge 21.1.265
Forge 52.1.20
Both fail during loader processors. This appears to be a shared installer runtime or metadata compatibility issue.
Steps to reproduce
Create a new instance in either Neoforge or Forge
If it works, continue and start the game
Expected behavior
Install fails, or fails when launching
Additional context
No response
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