FurnaceRecipe Error?

The Furnace does set the Result as the custom item but, when I take out the custom item, it gives me this error in the cmd. I haven't messed with Furnaces before until today so I'm confused with what is wrong ;\

Code:

package me.jetsinsu.mages.recipes;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.inventory.FurnaceRecipe;

public class CustomFurnaceRecipe {

    public static CustomFurnaceRecipe instance = new CustomFurnaceRecipe();
  
    public static CustomFurnaceRecipe getInstance(){
        return instance;
    }
  
    public void customFurnaceRecipe(){
      
        FurnaceRecipe s = new FurnaceRecipe(ItemUtil.getManager().createItem(Material.IRON_INGOT, 1, (short) 0, "Steel", "Smelted iron"), Material.IRON_INGOT);
        Bukkit.getServer().addRecipe(s);
    }
}

Error:

Code:

Error executing task
java.util.concurrent.ExecutionException: java.lang.ClassCastException: net.minecraft.server.v1_9_R1.ItemStack cannot be cast to java.lang.Float
        at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_91]
        at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_91]
        at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:46) [spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721) [spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]
Caused by: java.lang.ClassCastException: net.minecraft.server.v1_9_R1.ItemStack cannot be cast to java.lang.Float
        at net.minecraft.server.v1_9_R1.RecipesFurnace.b(RecipesFurnace.java:135) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.SlotFurnaceResult.c(SlotFurnaceResult.java:44) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.SlotFurnaceResult.a(SlotFurnaceResult.java:31) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.Container.a(Container.java:307) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1857) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_91]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_91]
        at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) ~[spigot-1.9.2.jar:git-Spigot-e000104-4cb3258]
        ... 5 more

I tried setting it as a regular item but it still gives me the error

Code:

FurnaceRecipe s = new FurnaceRecipe(new ItemStack(Material.IRON_INGOT), Material.IRON_INGOT);

 

The second parameter needs to be a float.

 

._.
"net.minecraft.server.v1_9_R1.ItemStack cannot be cast to java.lang.Float". You realize he's using a Material, correct? This stacktrace points towards an internal CraftBukkit method whilst registering the recipe. Also, if you'd take a look at the Javadocs:
https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/inventory/FurnaceRecipe.html#FurnaceRecipe(org.bukkit.inventory.ItemStack, org.bukkit.Material)

It actually does take a Material as the secondary parameter. The THIRD parameter is supposed to be a float value to specify the experience yield. It's actually an optional parameter as well, so it's not needed. This is not the issue

 

Ok, So I messed with the Furnace a little. It seems as thought if result is the same is a the item being burned, it will get the error. It won't if it the burned item and result are different :\

 

@JetsinsuGZ If this thread is solved please mark it as "Solved"
Also, dont abuse static :S