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ee53911a06
Agent and -Xshare:off both ruled out as causes. Restored normal agent injection. Updated docs with complete findings — issue remains unsolved. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
80 lines
4.4 KiB
Markdown
80 lines
4.4 KiB
Markdown
# Singleplayer Server Crash: fastutil ClassNotFoundException
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## Status: Open — NO SOLUTION (Feb 24-27 2026)
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## Symptom
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Singleplayer server crashes immediately on boot:
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```
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Exception in thread "main" java.lang.NoClassDefFoundError: it/unimi/dsi/fastutil/objects/ObjectArrayList
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at com.hypixel.hytale.plugin.early.EarlyPluginLoader.<clinit>(EarlyPluginLoader.java:34)
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at com.hypixel.hytale.Main.main(Main.java:36)
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Caused by: java.lang.ClassNotFoundException: it.unimi.dsi.fastutil.objects.ObjectArrayList
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at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
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```
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Server exits with code 1. Multiplayer works fine for the same user.
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## Affected Users
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1. **ヅ𝚃 JAYED !** (Feb 24) — Windows x86_64, had AOT cache errors before fastutil crash
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2. **Asentrix** (Feb 27) — Windows x86_64 (NT 10.0.26200.0), RTX 4060, Launcher v2.4.4, NO AOT cache errors
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- Reproduces 100% on singleplayer, every attempt
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- Multiplayer works fine for both users
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- macOS/Linux users are NOT affected
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## Ruled Out (confirmed via debug builds)
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| Suspect | Tested | Result |
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|---------|--------|--------|
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| **DualAuth Agent** | Debug build with agent completely disabled (`debug-no-agent` tag) | **Same crash.** Agent is innocent. |
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| **`-Xshare:off` (CDS)** | Added to `JAVA_TOOL_OPTIONS` in launcher code (`debug-xshare-off` tag) | **Did not help.** CDS is not the cause. |
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| **`-XX:+UseCompactObjectHeaders`** | Stripped via wrapper | **Did not help.** Server has `-XX:+IgnoreUnrecognizedVMOptions` anyway. |
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| **Corrupted game files** | User did repair + full reinstall | **Same crash.** |
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| **Java wrapper** | Logs confirm wrapper works correctly | Not the cause. |
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| **ARM64/Parallels** | User is on standard Windows x86_64 | Not applicable. |
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| **AOT cache** | Asentrix has no AOT errors (JAYED did), both crash the same way | Not the root cause. |
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## What We Know
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- `fastutil` is bundled inside `HytaleServer.jar` (fat/shaded JAR) — same JAR for all users
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- JVM's `BuiltinClassLoader` cannot find `it.unimi.dsi.fastutil.objects.ObjectArrayList` despite it being in the JAR
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- Crash happens at `EarlyPluginLoader` static initializer (line 34) which imports `ObjectArrayList`
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- The bundled JRE is identical for all users (downloaded by launcher)
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- The issue is **not** caused by anything the F2P launcher adds — it's the vanilla server JVM failing to load its own classes
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## Remaining Theories
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1. **Antivirus/security software** — Windows Defender or third-party AV intercepting JAR file reads. Real-time scanning + fat JAR = known conflict. **Untested** — user should try disabling AV temporarily.
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2. **Windows Insider build** — Asentrix is on NT 10.0.26200.0 (Windows 11 Dev/Insider). Bleeding-edge Windows may have JVM compatibility issues.
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3. **File locking** — Stalled `java.exe` processes holding `HytaleServer.jar` open (Asentrix had stalled processes killed at every launch).
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4. **Corrupted JRE on disk** — Despite being the same download, filesystem or AV may have corrupted specific JRE files on their system.
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## Next Steps to Try
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1. **Disable Windows Defender** temporarily — the only quick test left
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2. **Delete bundled JRE** and let launcher re-download — rules out local JRE corruption
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3. **Ask if official Hytale singleplayer works** — if it also crashes, it's their system (but F2P users may not have access)
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## Update History
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### Feb 24: First report (JAYED)
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User reported singleplayer crash. Initial investigation found AOT cache errors + fastutil ClassNotFoundException. Stripping `-XX:+UseCompactObjectHeaders` did not help.
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### Feb 27: Second report (Asentrix), extensive debugging
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- Asentrix hit same crash, no AOT errors — ruled out AOT as root cause
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- Built `debug-xshare-off`: added `-Xshare:off` to `JAVA_TOOL_OPTIONS` — **did not help**
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- Built `debug-no-agent`: completely disabled DualAuth agent — **same crash**
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- **Conclusion**: Neither the agent nor CDS is the cause. The JVM itself cannot load classes from the fat JAR on these specific Windows systems.
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- Note: wrapper `injectArgs` append AFTER `-jar`, so they cannot inject JVM flags — only `JAVA_TOOL_OPTIONS` works for JVM flags
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## Related
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- Java wrapper config: `backend/core/config.js` (stripFlags / injectArgs)
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- DualAuth Agent: v1.1.12, package `ws.sanasol.dualauth`
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- Game version at time of reports: `2026.02.19-1a311a592`
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- Debug tags: `debug-xshare-off`, `debug-no-agent`
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- Log submission IDs: `c88e7b71` (Asentrix initial), `0445e4dc` (xshare test), `748dceeb` (no-agent test)
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