Forge and NeoForge installers fail on Minecraft 1.21.1 with UnsupportedClassVersionError

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
52/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
java, rust
領域
backend

研究方向

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.

由索引模型根據 Issue 內容生成。

描述

app
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

主要語言
Rust
星號
2.5k
分支
663
平均合併
2 天 11 小時
30 天內合併 PR
122

環境準備

這個專案沒有提供開發容器、Dockerfile 或貢獻指南,環境需要你自己搭建:先看它的 README,通用步驟見我們的新手貢獻指南。

從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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