add example code for BAEL-1439

libraries/src/main/java/com/baeldung/netty/ChannelHandlerA.java

@@ -0,0 +1,22 @@
+package com.baeldung.netty;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+
+import java.util.logging.Logger;
+
+public class ChannelHandlerA extends ChannelInboundHandlerAdapter {
+
+    private Logger logger = Logger.getLogger(getClass().getName());
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        throw new Exception("Ooops");
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        logger.info("Exception Occurred in ChannelHandler A");
+        ctx.fireExceptionCaught(cause);
+    }
+}

libraries/src/main/java/com/baeldung/netty/ChannelHandlerB.java

@@ -0,0 +1,20 @@
+package com.baeldung.netty;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+
+import java.util.logging.Logger;
+
+
+public class ChannelHandlerB extends ChannelInboundHandlerAdapter {
+
+    private Logger logger = Logger.getLogger(getClass().getName());
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        logger.info("Exception Handled in ChannelHandler B");
+        logger.info(cause.getLocalizedMessage());
+        //do more exception handling
+        ctx.close();
+    }
+}

libraries/src/main/java/com/baeldung/netty/NettyServerB.java

@@ -0,0 +1,47 @@
+package com.baeldung.netty;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.SocketChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+
+public class NettyServerB  {
+
+    private int port;
+
+    private NettyServerB(int port) {
+        this.port = port;
+    }
+
+    private void run() throws Exception {
+
+        EventLoopGroup bossGroup = new NioEventLoopGroup();
+        EventLoopGroup workerGroup = new NioEventLoopGroup();
+
+        try {
+            ServerBootstrap b = new ServerBootstrap();
+            b.group(bossGroup, workerGroup)
+                .channel(NioServerSocketChannel.class)
+                .childHandler(new ChannelInitializer<SocketChannel>() {
+                    public void initChannel(SocketChannel ch) throws Exception {
+                        ch.pipeline().addLast(new ChannelHandlerA(), new ChannelHandlerB());
+                     }
+                })
+                .option(ChannelOption.SO_BACKLOG, 128)
+                .childOption(ChannelOption.SO_KEEPALIVE, true);
+            ChannelFuture f = b.bind(port).sync(); // (7)
+            f.channel().closeFuture().sync();
+        } finally {
+            workerGroup.shutdownGracefully();
+            bossGroup.shutdownGracefully();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        new NettyServerB(8080).run();
+    }
+}