PaperMC/nms-patches/RecipeFireworks.patch

--- a/net/minecraft/server/RecipeFireworks.java
+++ b/net/minecraft/server/RecipeFireworks.java
@@ -3,13 +3,16 @@
 import com.google.common.collect.Lists;
 import java.util.ArrayList;
 
-public class RecipeFireworks extends IRecipe {
+public class RecipeFireworks extends ShapelessRecipes { // CraftBukkit
 
     private ItemStack b;
 
+    // CraftBukkit start - Delegate to new parent class with bogus info
     public RecipeFireworks() {
+        super("", new ItemStack(Items.FIREWORKS, 0, 0), NonNullList.a(RecipeItemStack.a, RecipeItemStack.a(Items.GUNPOWDER)));
         this.b = ItemStack.a;
     }
+    // CraftBukkit end
 
     public boolean a(InventoryCrafting inventorycrafting, World world) {
         this.b = ItemStack.a;