Spoof Health Packets with ProtocolLib

gistfile1.txt

//Spoof Health Packets
ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(plugin, ENTITY_METADATA) {
    public void onPacketSending(PacketEvent event) {
        try {
            Player observer = event.getPlayer();
            StructureModifier<Entity> entityModifer = event.getPacket().getEntityModifier(observer.getWorld());
            org.bukkit.entity.Entity entity = entityModifer.read(0);
            if (entity != null && observer != entity && entity instanceof Player
                    && (entity.getPassenger() == null || entity.getPassenger() != observer)) {
                event.setPacket(event.getPacket().deepClone());
                StructureModifier<List<WrappedWatchableObject>> watcher = event.getPacket()
                        .getWatchableCollectionModifier();
                for (WrappedWatchableObject watch : watcher.read(0)) {
                    if (watch.getIndex() == 7 && (float) watch.getValue() > 0) {
                        watch.setValue(Math.max(1f, (float) r.nextInt(20)));
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});