No Useless Logging

Why I Made This Mod

If you've ever run a Minecraft server with named mobs or played with mods that spawn named entities, you've probably noticed your console and log files getting flooded with death messages like:

[Server thread/INFO] [minecraft/LivingEntity]: Named entity Sheep['Fluffy'/547, l='ServerLevel[world]', x=123.50, y=64.00, z=-789.30] died: Fluffy was slain by Zombie     These messages serve no practical purpose for most players and server administrators. They clutter the console, making it harder to spot important information, and they bloat log files over time. This is especially problematic on servers with:   Named villagers in trading halls or iron farms Named pets that might die to environmental hazards Modded entities that are spawned with custom names Adventure maps with named mobs for storytelling purposes     I created No Useless Logging to solve this problem once and for all.    

What It Does

No Useless Logging is a lightweight utility mod that filters out death messages for any entity that has a custom name tag. This includes:

✅ Vanilla mobs – Sheep, cows, villagers, horses, wolves, cats, and all other tameable/nameable entities
✅ Modded entities – Any mod that extends Minecraft's base LivingEntity class
✅ Villager death messages – Including the special villager-specific death log format
✅ All death causes – Whether the entity was slain, drowned, burned, fell, or died any other way

The mod works by installing a Log4j filter at the root logger level, which means it catches and blocks these messages before they ever reach your console or log file.

Important: This mod only filters log messages. It does not affect gameplay, death events, or any other game mechanics. Your entities will still die normally – you just won't see the spam in your logs.

Performance

No Useless Logging is designed with performance in mind:

• Minimal overhead – The filter only checks messages that contain death-related content
• Efficient string matching – Uses simple prefix checking (startsWith) rather than expensive regex operations
• No tick handlers – The mod doesn't hook into the game loop or run any recurring tasks
• No event listeners – Works purely at the logging level, completely separate from game events
• Tiny memory footprint – The entire mod is less than 6KB

The filter operates in O(1) time complexity for the most common case (checking if a message starts with "Named entity"), making it virtually unnoticeable even on high-traffic servers.

Reducing Log File Size

On servers with many named entities, death messages can significantly contribute to log file bloat. Here's what you can expect:

Scenario Without Mod With Mod Trading hall with 50 villagers Dozens of death messages during raids Clean logs Named mob farm Constant spam from entity deaths Silent operation Adventure server with named NPCs Log files grow rapidly Minimal log growth

 

By filtering these messages, you'll see:

• Smaller log files – Less disk space usage over time
• Cleaner console output – Easier to monitor server activity
• Faster log parsing – When analyzing logs for errors or issues

Compatibility

Minecraft Version: 1.21.1
Mod Loader: NeoForge 21.1.215+
Side: Both (Client & Server)

Works With:

• ✅ All vanilla entities
• ✅ Modded entities that extend LivingEntity
• ✅ Single-player worlds
• ✅ Dedicated servers
• ✅ LAN worlds

Installation:

• Server-only: Install on the server to filter server logs
• Client-only: Install on the client to filter client logs
• Both: Install on both for complete coverage

Mod Compatibility:

This mod operates at the logging level and does not modify any game classes or use mixins. It should be compatible with virtually every other mod. If you encounter any compatibility issues, please report them!

License

This mod is released under the MIT License. You are free to include it in modpacks, modify it, or use it however you like.

Made by Navrelis