Disable Sweep Attack

import java.lang.reflect.Field;

import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_14_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.plugin.java.JavaPlugin;

import io.netty.channel.Channel;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import net.minecraft.server.v1_14_R1.PacketPlayOutWorldParticles;
import net.minecraft.server.v1_14_R1.ParticleParam;

public class Main extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {
        for (Player p : Bukkit.getOnlinePlayers()) {
            injectPlayer(p);
        }
    }

    @Override
    public void onDisable() {
        for (Player p : Bukkit.getOnlinePlayers()) {
            removePlayer(p);
        }
    }

    @EventHandler
    public void onjoin(PlayerJoinEvent event) {
        injectPlayer(event.getPlayer());
    }

    @EventHandler
    public void onleave(PlayerQuitEvent event) {
        removePlayer(event.getPlayer());
    }

    private void removePlayer(Player player) {
        Channel channel = ((CraftPlayer) player).getHandle().playerConnection.networkManager.channel;
        channel.eventLoop().submit(() -> {
            channel.pipeline().remove(player.getName());
            return null;
        });
    }

    private void injectPlayer(Player player) {
        ChannelDuplexHandler channelDuplexHandler = new ChannelDuplexHandler() {

            @Override
            public void channelRead(ChannelHandlerContext channelHandlerContext, Object packet) throws Exception {
                super.channelRead(channelHandlerContext, packet);
            }

            @Override
            public void write(ChannelHandlerContext channelHandlerContext, Object packet, ChannelPromise channelPromise)
                    throws Exception {

                if (packet instanceof PacketPlayOutWorldParticles) {
                    PacketPlayOutWorldParticles particlePacket = (PacketPlayOutWorldParticles) packet;
                    Field particleField = particlePacket.getClass().getDeclaredField("j");
                    particleField.setAccessible(true);
                    ParticleParam packetParticleFieldParam = (ParticleParam) particleField.get(particlePacket);
                    if (packetParticleFieldParam.a().equals("minecraft:sweep_attack")) {
                        return;
                    }
                }
                super.write(channelHandlerContext, packet, channelPromise);
            }

        };

        ChannelPipeline pipeline = ((CraftPlayer) player).getHandle().playerConnection.networkManager.channel
                .pipeline();
        pipeline.addBefore("packet_handler", player.getName(), channelDuplexHandler);

    }
}