BAEL-7195 Custom Event Handlers and Listeners in Netty (#15634)

* Custom Event Handlers and Listeners in Netty

PR recreated.

* Update libraries-server-2/src/test/java/com/baeldung/netty/customhandlersandlisteners/ChatIntegrationTest.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

* Update libraries-server-2/src/test/java/com/baeldung/netty/customhandlersandlisteners/ChatIntegrationTest.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

* Update libraries-server-2/src/main/java/com/baeldung/netty/customhandlersandlisteners/handler/ServerEventHandler.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

* Update libraries-server-2/src/main/java/com/baeldung/netty/customhandlersandlisteners/ChatServerMain.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

* Update libraries-server-2/src/main/java/com/baeldung/netty/customhandlersandlisteners/ChatClientMain.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

* changing to default visibility

* review 2

* Update libraries-server-2/src/main/java/com/baeldung/netty/customhandlersandlisteners/listener/ChannelInfoListener.java

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

---------

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>

libraries-server-2/pom.xml

@@ -30,6 +30,12 @@
             <artifactId>jetty-webapp</artifactId>
             <version>${jetty.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <version>${netty.version}</version>
+        </dependency>
+
     </dependencies>
 
     <build>
@@ -73,6 +79,7 @@
     <properties>
         <jetty.version>9.4.27.v20200227</jetty.version>
         <alpn.version>8.1.11.v20170118</alpn.version>
+        <netty.version>4.1.104.Final</netty.version>
     </properties>
 
 </project>