No Slime Superflat

A lightweight, memory-efficient Minecraft mod that prevents slimes from spawning in Superflat worlds. This mod serves as a lean alternative to Collective's "Superflat World No Slimes" mod, specifically designed to eliminate memory leaks and reduce overhead

Installation • Features

Overview

This mod was created to address performance issues found in dependency-heavy solutions like Collective, which contains memory leaks in version 1.12.2. No Slime Superflat provides the same functionality with zero memory leaks and negligible performance impact.

Features

• Zero Memory Leaks: Stateless event handling ensures no memory accumulation over time
• Minimal Performance Impact: Less than 0.1ms per tick with early-exit optimization
• Runtime Configuration: Enable/disable slime prevention without restarting
• Lightweight: Approximately 50KB memory footprint
• Easy to Port: Clean codebase with patch-friendly architecture for version migration
• No Dependencies: Standalone mod requiring only Forge or Fabric

Performance Analysis

Memory Usage

• Base memory footprint: ~50KB RAM
• No garbage collection pressure (stateless design)
• Zero object allocation during normal operation

CPU Overhead

• Average processing time: <0.1ms per tick
• Early-exit pattern minimizes unnecessary checks
• Only processes EntitySlime instances in Superflat worlds

Comparison with Alternatives

Mod	Memory	Dependencies	Leaks	Rating
No Slime Superflat	~50KB	None	None	⭐⭐⭐⭐⭐
Superflat World No Slimes	~2MB+	Multiple	Yes	⭐⭐

Installation

Requirements

For 1.12.2

• Forge 14.23.5.2847 or compatible

For 1.16.5

• Forge 36.2.30 or higher

Steps

1. Download the latest release from the Releases page
2. Place the JAR file in your .minecraft/mods folder
3. Launch Minecraft with Forge profile
4. Verify installation in the Mods menu

Commands

It was removed in version 1.4 because they were useless and made it a bit more difficult for me to update the mod.

The mod includes a built-in command system:

• /noslimesuperflat - Shows statistics about blocked slimes
• /noslimesuperflat stats - Detailed statistics display
• /noslimesuperflat reload - Reloads configuration without restart

Statistics include:

• Total slimes blocked
• Spawn checks performed
• Efficiency percentage
• Current configuration status

Building from Source

Prerequisites

• Java 8 (required for compatibility with ForgeGradle 2.3/5.1+) or for versions greater than 1.21 Java 21/Java 25
• Git

Build Instructions

# Clone the repository
git clone https://github.com/Onyx-i7/NoSlimeSuperflatMod.git
cd NoSlimeSuperflatMod

# Build the mod
./gradlew build

# Output location
ls build/libs/NoSlimeSuperflat-*.jar

For detailed build instructions, see BUILD_INSTRUCTIONS.md.

Project Structure

NoSlimeSuperflat/
├── src/main/java/com/onyxi7/noslimesuperflat/
│   ├── NoSlimeSuperflat.java    # Main mod class with configuration
│   ├── FabricEventHandler.java  # Slime spawn event handler
├── src/main/resources
│   ├── fabric.mod.json          # Mod metadata
├── build.gradle                 # Build configuration
├── README.md                    # This file
└── LICENSE                      # MIT License

Technical Details

How It Works

The mod intercepts the EntityJoinWorldEvent and cancels slime spawns when:

1. The entity is an instance of EntitySlime
2. The world type is Superflat (WorldType.FLAT)
3. The feature is enabled in configuration

Code Design Principles

• Stateless Event Handling: All event handlers are static methods
• Early-Exit Pattern: Conditions checked in order of likelihood
• Defensive Programming: Null checks and exception handling
• Documentation: Comprehensive JavaDoc for all public APIs

Porting Guide

To port this mod to other Minecraft versions:

1. Update build.gradle:

   • Change Minecraft version
   • Update Forge version
   • Update mappings

2. Review API changes in:

   • EntityJoinWorldEvent
   • EntitySlime class
   • WorldType enum

3. Test thoroughly in target version

See PORTING_GUIDE.md for detailed and updated instructions.

Troubleshooting

Common Issues

Mod Not Appearing in Game

Causes:

• Incorrect Forge version installed
• JAR file not in mods folder
• Mod ID conflict

Reporting Issues

Before reporting an issue:

1. Check existing issues on GitHub
2. Verify you're using the latest version
3. Collect relevant information:
   • Minecraft version
   • Forge version
   • Mod list
   • Latest log file
   • Configuration file

Submit issues at: https://github.com/Onyx-i7/NoSlimeSuperflatMod/issues

Compatibility

✅ Works with EVERYTHING

This mod is completely standalone and doesn't conflict with other mods

⚠️ Incompatible with:

• Any mod that modifies slime spawning in superflat worlds (they do the same thing)

License

This project is licensed under the MIT License. See LICENSE for details.

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Repository: https://github.com/Onyx-i7/NoSlimeSuperflatMod
Issues: https://github.com/Onyx-i7/NoSlimeSuperflatMod/issues
Releases: https://github.com/Onyx-i7/NoSlimeSuperflatMod/releases
Modrinth: https://modrinth.com/mod/no-superflat-slimes
CurseForge: https://www.curseforge.com/minecraft/mc-mods/nosuperflatslimes