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package com.example.examplemod;

import net.minecraft.init.Blocks;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import org.apache.logging.log4j.Logger;

@Mod(modid = ExampleMod.MODID, name = ExampleMod.NAME, version = ExampleMod.VERSION)

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We have an int 'version' for registries, which is incremented whenever (existing?) id mappings change.
We also have an int->int versioning map for the id mappings, which stores the registry version that last altered the mapping for each id.

We save the registry version number into save data, alongside minecraft's own "DataVersion" number.

We can then setup datafixers to run if the current registry version is not the registry version the data was saved under.
If the 'last changed' version for a given id is greater than the saved data's registry version, then the saved id no longer represents the correct data and should be dummied out.

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How to install Forge: For Players

Go to https://files.minecraftforge.net and select the Minecraft version you wish to get Forge for from the list.

You can download the installer for the Recommended Build or the Latest Build there. Latest builds may have newer features but may be more unstable as a result. The installer will attempt to install Forge into your vanilla launcher environment, where you can then create a new profile using that version and play the game!

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public class EmptyClassInheritanceMultiMap extends ClassInheritanceMultiMap<Entity>
{
    public static final EmptyClassInheritanceMultiMap INSTANCE = new EmptyClassInheritanceMultiMap();

    private EmptyClassInheritanceMultiMap()
    {
        super(Entity.class);
    }

    @Override

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package net.minecraftforge.debug;

import net.minecraft.block.Block;
import net.minecraft.block.BlockColored;
import net.minecraft.block.material.Material;
import net.minecraft.block.state.BlockStateContainer;
import net.minecraft.block.state.IBlockState;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.BlockModelShapes;
import net.minecraft.client.renderer.block.model.BakedQuad;

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/*
 * Minecraft Forge
 * Copyright (c) 2016.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation version 2.1
 * of the License.
 *
 * This library is distributed in the hope that it will be useful,

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client.renderer.texture
	Stitcher
		doStitch
entity
	EntityList
		createEntityFromNBT
tileentity
	TileEntity
		create
util

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--- ../src-base/minecraft/net/minecraft/client/renderer/block/model/SimpleBakedModel.java
+++ ../src-work/minecraft/net/minecraft/client/renderer/block/model/SimpleBakedModel.java
@@ -158,6 +158,8 @@
                 }
                 else
                 {
+                    ((java.util.ArrayList<BakedQuad>) field_177656_a).trimToSize();
+                    for (List<BakedQuad> list : field_177654_b.values()) ((java.util.ArrayList<BakedQuad>) list).trimToSize();
                     return new SimpleBakedModel(this.field_177656_a, this.field_177654_b, this.field_177655_c, this.field_177653_e, this.field_177652_d, this.field_177651_f, this.field_188646_c);
                 }