I'm having some trouble with the item model and texture setting. There's nothing in the console that indicates that the texture wasn't found or that the JSON model file loaded.

 

Mod File:

package tlhpoe.scalae;

import net.minecraftforge.common.capabilities.*;
import net.minecraftforge.fml.common.*;
import net.minecraftforge.fml.common.Mod.*;
import net.minecraftforge.fml.common.event.*;
import tlhpoe.scalae.capabilities.ScalaeCapabilities.*;

@Mod(modid = Scalae.MODID, version = Scalae.VERSION)
public class Scalae	{
    public static final String MODID = "scalae";
    public static final String VERSION = "1.0";
    
    @Instance(MODID)
    public static Scalae instance;
    
    @SidedProxy(serverSide = "tlhpoe.scalae.CommonProxy", clientSide = "tlhpoe.scalae.ClientProxy")
    public static CommonProxy proxy;
    
    @CapabilityInject(IScalaeCapability.class)
    public static final Capability<IScalaeCapability> CAPABILITY = null;
    
    @EventHandler
    public void preInit(FMLPreInitializationEvent event) {
    	proxy.initServer(event);
    	proxy.initClient(event);
    }
    
    @EventHandler
    public void init(FMLInitializationEvent event) {
    	proxy.initServer(event);
    	proxy.initClient(event);
    }
    
    @EventHandler
    public void postInit(FMLPostInitializationEvent event) {
    	proxy.initServer(event);
    	proxy.initClient(event);
    }
}

 

Common Proxy:

package tlhpoe.scalae;

import net.minecraftforge.common.*;
import net.minecraftforge.common.capabilities.*;
import net.minecraftforge.fml.common.event.*;
import net.minecraftforge.fml.common.registry.*;
import tlhpoe.scalae.capabilities.ScalaeCapabilities.*;
import tlhpoe.scalae.handler.*;
import tlhpoe.scalae.item.*;

public class CommonProxy {
public void initServer(FMLStateEvent state) {
	if(state instanceof FMLPreInitializationEvent) {
		GameRegistry.register(ItemScalaeXP.INSTANCE);

		CapabilityManager.INSTANCE.register(IScalaeCapability.class, new Storage(), DefaultImpl.class);

		MinecraftForge.EVENT_BUS.register(new ScalaeEvents());
	}
}

public void initClient(FMLStateEvent state) {
}
}

 

ClientProxy:

package tlhpoe.scalae;

import net.minecraft.client.*;
import net.minecraft.client.renderer.block.model.*;
import net.minecraft.item.*;
import net.minecraftforge.client.model.*;
import net.minecraftforge.fml.common.event.*;
import tlhpoe.scalae.item.*;

public class ClientProxy extends CommonProxy {
@Override
public void initClient(FMLStateEvent state) {
	super.initClient(state);

	if(state instanceof FMLInitializationEvent) {
		registerItemRenderer(ItemScalaeXP.INSTANCE);
	}
}

private static void registerItemRenderer(Item i) {
	ModelLoader.setCustomModelResourceLocation(i, 0, new ModelResourceLocation(i.getRegistryName(), "inventory"));
}
}

 

Item File:

public class ItemScalaeXP extends Item {
public static final ItemScalaeXP INSTANCE = new ItemScalaeXP();
public static final String NAME = "scalae_xp";

private ItemScalaeXP() {
	setRegistryName(NAME);
	setUnlocalizedName(NAME);
	setCreativeTab(CreativeTabs.COMBAT);
}

...

ModelLoader.setCustomModelResourceLocation

must be called in preInit, not init.