Crash when used with Polymer #4
Description
See: Patbox/polymer#203 (comment)
Minimal reproduction:
Mod List
- Fabric API [0.128.1+1.21.5] by FabricMC (fabric-api-0.128.1+1.21.5.jar)
- HM Api [1.0.1+1.21.2] by AzureAaron (hm-api-1.0.1+1.21.2.jar)
- Polymer [0.12.6+1.21.5] by Patbox (polymer-bundled-0.12.6+1.21.5.jar)
Crash Log
---- Minecraft Crash Report ----
// Shall we play a game?
Time: 2025-07-27 11:54:00
Description: Initializing game
java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'fabric-data-attachment-api-v1' at 'net.fabricmc.fabric.impl.attachment.sync.AttachmentSync'!
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
at knot//net.minecraft.class_310.<init>(class_310.java:473)
at knot//net.minecraft.client.main.Main.main(Main.java:249)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)
Caused by: java.lang.ExceptionInInitializerError
at knot//net.fabricmc.fabric.mixin.attachment.CustomPayloadC2SPacketAccessor.getMaxPayloadSize(CustomPayloadC2SPacketAccessor.java)
at knot//net.fabricmc.fabric.impl.attachment.sync.AttachmentChange.<clinit>(AttachmentChange.java:63)
at knot//net.fabricmc.fabric.impl.attachment.sync.s2c.AttachmentSyncPayloadS2C.<clinit>(AttachmentSyncPayloadS2C.java:30)
at knot//net.fabricmc.fabric.impl.attachment.sync.AttachmentSync.onInitialize(AttachmentSync.java:103)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399)
... 9 more
Caused by: java.lang.ClassCastException: class net.azureaaron.hmapi.network.WrappedPacketCodec cannot be cast to class eu.pb4.polymer.networking.impl.ExtCustomPayloadCodec (net.azureaaron.hmapi.network.WrappedPacketCodec and eu.pb4.polymer.networking.impl.ExtCustomPayloadCodec are in unnamed module of loader 'knot' @61009542)
at knot//net.minecraft.class_2817.modifyExpressionValue$ben000$polymer-networking$modifyCodec(class_2817.java:1517)
at knot//net.minecraft.class_2817.<clinit>(class_2817.java:18)
... 14 more
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
at knot//net.minecraft.class_310.<init>(class_310.java:473)
-- Initialization --
Details:
Modules:
Stacktrace:
at knot//net.minecraft.client.main.Main.main(Main.java:249)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)
-- System Details --
Details:
Minecraft Version: 1.21.5
Minecraft Version ID: 1.21.5
Operating System: Mac OS X (aarch64) version 15.5
Java Version: 21.0.7, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 200699648 bytes (191 MiB) / 826277888 bytes (788 MiB) up to 4294967296 bytes (4096 MiB)
CPUs: 8
Processor Vendor: Apple Inc.
Processor Name: Apple M1
Identifier: Apple Inc. Family 0x1b588bb3 Model 0 Stepping 0
Microarchitecture: ARM64 SoC: Firestorm + Icestorm
Frequency (GHz): 3.20
Number of physical packages: 1
Number of physical CPUs: 8
Number of logical CPUs: 8
Graphics card #0 name: Apple M1
Graphics card #0 vendor: Apple (0x106b)
Graphics card #0 VRAM (MiB): 0.00
Graphics card #0 deviceId: unknown
Graphics card #0 versionInfo: unknown
Memory slot #0 capacity (MiB): 0.00
Memory slot #0 clockSpeed (GHz): 0.00
Memory slot #0 type: unknown
Virtual memory max (MiB): 10240.00
Virtual memory used (MiB): 7140.69
Swap memory total (MiB): 2048.00
Swap memory used (MiB): 635.38
Space in storage for jna.tmpdir (MiB): <path not set>
Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): <path not set>
Space in storage for io.netty.native.workdir (MiB): <path not set>
Space in storage for java.io.tmpdir (MiB): available: 94968.50, total: 233752.44
Space in storage for workdir (MiB): available: 94968.50, total: 233752.44
JVM Flags: 2 total; -Xms512m -Xmx4096m
Fabric Mods:
fabric-api: Fabric API 0.128.1+1.21.5
fabric-api-base: Fabric API Base 0.4.62+73a52b4b49
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.96+86c3a9f149
fabric-biome-api-v1: Fabric Biome API (v1) 16.0.7+2dd063df49
fabric-block-api-v1: Fabric Block API (v1) 1.1.0+ed91556f49
fabric-block-view-api-v2: Fabric BlockView API (v2) 1.0.26+aa6d566c49
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 2.0.16+86c3a9f149
fabric-client-tags-api-v1: Fabric Client Tags 1.1.37+86c3a9f149
fabric-command-api-v1: Fabric Command API (v1) 1.2.70+f71b366f49
fabric-command-api-v2: Fabric Command API (v2) 2.2.49+73a52b4b49
fabric-commands-v0: Fabric Commands (v0) 0.2.87+df3654b349
fabric-content-registries-v0: Fabric Content Registries (v0) 10.0.14+3e6c1f7d49
fabric-convention-tags-v1: Fabric Convention Tags 2.1.33+7f945d5b49
fabric-convention-tags-v2: Fabric Convention Tags (v2) 2.15.2+6d9989f349
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.3.12+86c3a9f149
fabric-data-attachment-api-v1: Fabric Data Attachment API (v1) 1.8.5+6d9989f349
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 22.5.2+a0fab30c49
fabric-dimensions-v1: Fabric Dimensions API (v1) 4.0.17+3e6c1f7d49
fabric-entity-events-v1: Fabric Entity Events (v1) 2.1.0+3ce7866349
fabric-events-interaction-v0: Fabric Events Interaction (v0) 4.0.15+64e3057949
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.70+c327076a49
fabric-item-api-v1: Fabric Item API (v1) 11.4.1+e46fd76a49
fabric-item-group-api-v1: Fabric Item Group API (v1) 4.2.9+3459fc6149
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.63+ecf51cdc49
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.61+df3654b349
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.6.0+230071a049
fabric-loot-api-v2: Fabric Loot API (v2) 3.0.48+3f89f5a549
fabric-loot-api-v3: Fabric Loot API (v3) 1.0.36+86c3a9f149
fabric-message-api-v1: Fabric Message API (v1) 6.1.0+fe971bba49
fabric-model-loading-api-v1: Fabric Model Loading API (v1) 5.2.3+5281b90749
fabric-networking-api-v1: Fabric Networking API (v1) 4.5.0+775be32c49
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 21.1.2+b8d6ba7049
fabric-particles-v1: Fabric Particles (v1) 4.1.2+112e550e49
fabric-recipe-api-v1: Fabric Recipe API (v1) 8.1.8+3235ab3249
fabric-registry-sync-v0: Fabric Registry Sync (v0) 6.1.22+cd64004349
fabric-renderer-api-v1: Fabric Renderer API (v1) 6.1.2+bdf4842249
fabric-renderer-indigo: Fabric Renderer - Indigo 3.1.2+5281b90749
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.64+73761d2e49
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.1.27+86c3a9f149
fabric-rendering-v1: Fabric Rendering (v1) 11.3.0+a272b33849
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 5.0.21+73a52b4b49
fabric-resource-loader-v0: Fabric Resource Loader (v0) 3.1.7+847e5f5c49
fabric-screen-api-v1: Fabric Screen API (v1) 2.0.46+86c3a9f149
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.129+c327076a49
fabric-sound-api-v1: Fabric Sound API (v1) 1.0.38+86c3a9f149
fabric-tag-api-v1: Fabric Tag API (v1) 1.0.17+ecf51cdc49
fabric-transfer-api-v1: Fabric Transfer API (v1) 5.4.24+7b20cbb049
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 6.3.17+f17a180c49
fabricloader: Fabric Loader 0.16.14
mixinextras: MixinExtras 0.4.1
hm-api: HM Api 1.0.1+1.21.2
java: OpenJDK 64-Bit Server VM 21
minecraft: Minecraft 1.21.5
polymer-bundled: Polymer 0.12.6+1.21.5
polymer-autohost: Polymer (Auto Host) 0.12.6+1.21.5
io_netty_netty-codec-http: netty-codec-http 4.1.82
polymer-blocks: Polymer (Textured Blocks) 0.12.6+1.21.5
polymer-common: Polymer (Common) 0.12.6+1.21.5
packet_tweaker: Packet Tweaker 0.6.0-pre.1+1.21.2-pre3
polymer-core: Polymer (Core) 0.12.6+1.21.5
polymer-networking: Polymer (Networking) 0.12.6+1.21.5
polymer-registry-sync-manipulator: Polymer (Registry Sync Manipulator) 0.12.6+1.21.5
polymer-resource-pack: Polymer (Resource Pack) 0.12.6+1.21.5
polymer-resource-pack-extras: Polymer (Resource Pack Extras) 0.12.6+1.21.5
polymer-sound-patcher: Polymer (Sound Patcher) 0.12.6+1.21.5
polymer-virtual-entity: Polymer (Virtual Entity) 0.12.6+1.21.5
Launched Version: 1.21.5
Launcher name: PrismLauncher
Backend library: LWJGL version 3.3.3-snapshot
Backend API: Unknown
Window size: <not initialized>
GFLW Platform: <error>
Render Extensions: ERR
GL debug messages: <no renderer available>
Is Modded: Definitely; Client brand changed to 'fabric'
Universe: 404
Type: Client (map_client.txt)
Locale: en_US
System encoding: UTF-8
File encoding: UTF-8
CPU: 8x Apple M1