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This is a client library for Nadron server https://github.com/menacher/java-game-server/tree/netty4/nadron. Java clients can use this program to connect and interact with nadron server.

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package io.nadron.client.handlers.netty;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.DatagramChannel;

import java.net.InetSocketAddress;

public class UDPPipelineFactory extends ChannelInitializer
{
	public static final String EVENT_ENCODER_NAME = "eventEncoder";
	private static UDPUpstreamHandler UDP_UPSTREAM_HANDLER;
	private static UDPPipelineFactory INSTANCE;
	private static UDPEventEncoder udpEventEncoder;
	static {
		UDP_UPSTREAM_HANDLER = new UDPUpstreamHandler();
	}
	
	private InetSocketAddress udpServerAddress;
	public UDPPipelineFactory(InetSocketAddress udpServerAddress)
	{
		this.udpServerAddress = udpServerAddress;
	}
	
	@Override
	protected void initChannel(DatagramChannel ch) throws Exception 
	{
		ChannelPipeline pipeline = ch.pipeline();
		pipeline.addLast(EVENT_ENCODER_NAME, getEventEncoder(udpServerAddress));
		pipeline.addLast("UDPUpstreamHandler",UDP_UPSTREAM_HANDLER);
	}
	
	public synchronized static UDPPipelineFactory getInstance(InetSocketAddress udpServerAddress)
	{
		if(null == INSTANCE)
		{
			INSTANCE = new UDPPipelineFactory(udpServerAddress);
		}
		return INSTANCE;
	}

	public synchronized static ChannelHandler getEventEncoder(InetSocketAddress udpServerAddress){
		if(null == udpEventEncoder){
			udpEventEncoder = new UDPEventEncoder(udpServerAddress);
		}
		return udpEventEncoder;
	}
}