I just made a tool.. Here is how. In game the item works. Just crafting breaks

 

Core class:

 

public static ItemModPickaxe emeraldPickaxe;

public static ToolMaterial EMERALDMATERIAL = EnumHelper.addToolMaterial("EMERALD", 3, 600, 10.0F, 4.0F, 30);

 

ItemModPickaxe Class:

 

public class ItemModPickaxe extends ItemPickaxe {

 

public ItemModPickaxe(String unlocalizedName, ToolMaterial material) {

super(material);

this.setUnlocalizedName(unlocalizedName);

}

 

public void RegisterRenderer(String modelName){

System.out.println("INTIALIZING ITEM RENDERER: " + modelName);

 

Minecraft.getMinecraft().getRenderItem().getItemModelMesher().register(this, 0, new ModelResourceLocation(Core.MODID+":"+modelName, "inventory"));;

}

}

 

Client Proxy in the init method:

 

Core.emeraldPickaxe.RegisterRenderer("emerald_pickaxe");

 

Common Proxy Class:

GameRegistry.registerItem(Core.emeraldPickaxe = new ItemModPickaxe("emerald_pickaxe", Core.EMERALDMATERIAL), "emerald_pickaxe");

 

//Creating the Recipe now:

 

GameRegistry.addRecipe(new ItemStack(Core.emeraldPickaxe), new Object[]{

"###",

" I ",

" I ", '#', Items.emerald, 'I', Items.stick});

 

And then it crashes with: http://pastebin.com/jMPEGECj

 

 

What is the method called in which you register you item (CommonProxy)?

 

EDIT: It might be that you are overriding the same method you use to register the item.