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I am fairly new to Minecraft Modding (I have around 5 years Java experience).
I want to prevent vanilla bows from firing. Looking into the docs for Forge I came across the ArrowNockEvent which should allow me to cancel any bow actions.
But even thought the event is marked as @Cancelable, Forge still throws an IllegalArgumentException when I try to cancel the event.
Here is the code if I am doing something wrong:

 

@SubscribeEvent(priority = EventPriority.HIGHEST)
    public void onHit(ArrowNockEvent event) {
        // not sure if machines can trigger this event
        if (event.getEntityPlayer() != null) {
            ItemStack bow = event.getBow();
            System.out.println(bow);
            System.out.println("Empty? " + ItemStackTools.isEmpty(bow));
            if (!ItemStackTools.isEmpty(bow)) {
                if(bow.getItem() instanceof ItemBow) {
                    event.setCanceled(true);
                }
            }
        }
    }

 

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