Remove vaadin tests (#2257)

* Refactor Vaadin samples

* Refactor Vaadin samples

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

@@ -13,7 +13,7 @@ public class NettyServer {
 
     private int port;
 
-    public NettyServer(int port) {
+    private NettyServer(int port) {
         this.port = port;
     }
 
@@ -27,7 +27,7 @@ public class NettyServer {
         new NettyServer(port).run();
     }
 
-    public void run() throws Exception {
+    private void run() throws Exception {
         EventLoopGroup bossGroup = new NioEventLoopGroup();
         EventLoopGroup workerGroup = new NioEventLoopGroup();
         try {

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

@@ -4,27 +4,27 @@ public class RequestData {
     private int intValue;
     private String stringValue;
 
-    public int getIntValue() {
+    int getIntValue() {
         return intValue;
     }
 
-    public void setIntValue(int intValue) {
+    void setIntValue(int intValue) {
         this.intValue = intValue;
     }
 
-    public String getStringValue() {
+    String getStringValue() {
         return stringValue;
     }
 
-    public void setStringValue(String stringValue) {
+    void setStringValue(String stringValue) {
         this.stringValue = stringValue;
     }
 
     @Override
     public String toString() {
         return "RequestData{" +
-                "intValue=" + intValue +
-                ", stringValue='" + stringValue + '\'' +
-                '}';
+          "intValue=" + intValue +
+          ", stringValue='" + stringValue + '\'' +
+          '}';
     }
 }

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

@@ -3,11 +3,11 @@ package com.baeldung.netty;
 public class ResponseData {
     private int intValue;
 
-    public int getIntValue() {
+    int getIntValue() {
         return intValue;
     }
 
-    public void setIntValue(int intValue) {
+    void setIntValue(int intValue) {
         this.intValue = intValue;
     }
 

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

@@ -1,11 +1,11 @@
 package com.baeldung.netty;
 
-import java.util.List;
-
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ReplayingDecoder;
 
+import java.util.List;
+
 public class ResponseDataDecoder extends ReplayingDecoder<ResponseData> {
 
     @Override