isXander / isXander/YetAnotherConfigLib
YACL 3.8.2+1.21.4-fabric crashes Fabric Loader with invalid access widener header
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- Dominant language
- Java
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Description
YACL 3.8.2+1.21.4-fabric crashes my Fabric 1.21.4 dedicated server during startup.
Tested versions from Modrinth:
- YACL 3.7.1: works
- YACL 3.8.1: works
- YACL 3.8.2: crashes
Environment:
- Minecraft: 1.21.4
- Fabric Loader: 0.17.2
- Java: 21
The crash occurs during Fabric's access widener loading phase:
Caused by: java.lang.RuntimeException: Failed to read accessWidener file from mod yet_another_config_lib_v3
...
Caused by: net.fabricmc.loader.impl.lib.accesswidener.AccessWidenerFormatException:
Invalid access widener file header. Expected: 'accessWidener <version> <namespace>'
Since downgrading YACL to 3.8.1 makes the exact same modpack start successfully, this appears to be specific to the 3.8.2 JAR or its packaging.
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- Open a pull request that references the issue number.
Research direction
Compare the YACL 3.8.1 and 3.8.2 JARs, focusing on the access widener file that Fabric Loader reads during startup. Reproduce the issue on a Minecraft 1.21.4 dedicated server with Fabric Loader 0.17.2, then verify that the packaged file has a valid access widener header and the server starts successfully.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- build-system
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 68/100