Hazmat
unethical bugfixes and crash "fixes"
About this Mod
Hazmat
Unethical "fixes" to random crash issues.
Datapack Filter Fix
LifecycledResourceManagerImplMixin=false in the config to disable. Fixes Mojang's fucked up pack.mcmeta filtering system, since they somehow forgot to make the namespace filter actually do anything.
Force Attribute
DefaultAttributeContainerMixin=false in the config to disable. Will prevent any crashes due to entities not having attributes set.
Packet Fucker
DecoderHandlerMixin=true in the config to enable. Will prevent any crashes due to invalid server-sent packets. NOT GOOD FOR GENERAL USE. This was implemented as a temporary flag to go into broken worlds to manually remove broken blocks or items.
Player Backup x7
PlayerSaveHandlerMixin=false in the config to disable. Will keep seven extra playerdata backups alongside the normal one.
Available Versions
How to Install Hazmat on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "Hazmat". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1, 1.21
Server-side
~ OptionalRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Hazmat server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is Hazmat compatible with fabric?
Hazmat officially supports fabric for Minecraft 1.21.1, 1.21. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Hazmat – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Hazmat consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Install Hazmat with just one click on your server.