@EventHandler
public void onJoin(PlayerJoinEvent event) {
    if (generalConf.isCraftingEnabled()) {
        List<NamespacedKey> keys = new ArrayList<>();
        for (BaseDuctType bdt : ductRegister.baseDuctTypes()) {
            for (Object type : bdt.ductTypes()) {
                DuctType dt = (DuctType) type;
                if (dt.getDuctRecipe() != null) {
                    NamespacedKey key = ((Keyed) dt.getDuctRecipe()).getKey();
                    keys.add(key);
                }
            }
            if (bdt.is("pipe")) {
                keys.add(((PipeManager) bdt.getDuctManager()).getWrenchRecipe().getKey());
            }
        }
        event.getPlayer().discoverRecipes(keys);
    }
}
 

public static String getRecipeKey(org.bukkit.inventory.Recipe rec, boolean dur){
	if(rec instanceof Keyed){
		return ((Keyed)rec).getKey().getKey();
	}else{
		return "nonkeyed:" + rec.getResult().getType().toString() + (dur ? rec.getResult().getDurability() : "");
	}
}