Netty inbound / outbound socket exception handler

import io.netty.channel.*;

import java.net.SocketAddress;

public class ExceptionHandler extends ChannelDuplexHandler {

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Uncaught exceptions from inbound handlers will propagate up to this handler 
    }

    @Override
    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
        ctx.connect(remoteAddress, localAddress, promise.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) {
                if (!future.isSuccess()) {
                    // Handle connect exception here...
                }
            }
        }));
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
        ctx.write(msg, promise.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) {
                if (!future.isSuccess()) {
                    // Handle write exception here...
                }
            }
        }));
    }

    // ... override more outbound methods to handle their exceptions as well
}