Tomcat 9 and websocket. Got a 404 error. What is wrong in my code?











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I'm t rying to make my the first simple client-servet application with web socket and tomcat 9 server. I found this example in the enternet. I had the next error:



(index):17 WebSocket connection to 'ws://localhost:8080/JavaWebSocket/ws' failed: 


Error during WebSocket handshake: Unexpected response code: 404"



it's this line:



var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws")" 


I thought the initialisation should be



 var webSocket = new WebSocket("ws://localhost:8080/[nameOfTheClassWithWebSocket]/ws");


But it doesn't work too :( I tried everything :( I can't solve this problem :(



Java code and Jsp file with project scheme are bellow.



Java code:



package socket;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/ws")
public class WebSocketServerExample {
@OnOpen
public void onOpen(){
System.out.println("Open Connection ...");
}

@OnClose
public void onClose(){
System.out.println("Close Connection ...");
}

@OnMessage
public String onMessage(String message){
System.out.println("Message from the client: " + message);
String echoMsg = "Echo from the server : " + message;
return echoMsg;
}

@OnError
public void onError(Throwable e){
e.printStackTrace();
}
}


jsp file:



<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta charset="UTF-8">
<title>Tomcat WebSocket</title>
</head>
<body>
<form>
<input id="message" type="text">
<input onclick="wsSendMessage();" value="Echo" type="button">
<input onclick="wsCloseConnection();" value="Disconnect" type="button">
</form>
<br>
<textarea id="echoText" rows="5" cols="30"></textarea>
<script type="text/javascript">
var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws");
var echoText = document.getElementById("echoText");
echoText.value = "";
var message = document.getElementById("message");
webSocket.onopen = function(message){ wsOpen(message);};
webSocket.onmessage = function(message){ wsGetMessage(message);};
webSocket.onclose = function(message){ console.log(message);};
webSocket.onerror = function(message){ console.log(message);};
function wsOpen(message){
echoText.value += "Connected ... n";
}
function wsSendMessage(){
webSocket.send(message.value);
echoText.value += "Message sended to the server : " + message.value + "n";
message.value = "";
}
function wsCloseConnection(){
webSocket.close();
}
function wsGetMessage(message){
echoText.value += "Message received from to the server : " + message.data + "n";
}
function wsClose(message){
echoText.value += "Disconnect ... n";
}

function wserror(message){
echoText.value += "Error ... n";
}
</script>
</body>
</html>


Scheme of the Project










share|improve this question


























    up vote
    1
    down vote

    favorite












    I'm t rying to make my the first simple client-servet application with web socket and tomcat 9 server. I found this example in the enternet. I had the next error:



    (index):17 WebSocket connection to 'ws://localhost:8080/JavaWebSocket/ws' failed: 


    Error during WebSocket handshake: Unexpected response code: 404"



    it's this line:



    var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws")" 


    I thought the initialisation should be



     var webSocket = new WebSocket("ws://localhost:8080/[nameOfTheClassWithWebSocket]/ws");


    But it doesn't work too :( I tried everything :( I can't solve this problem :(



    Java code and Jsp file with project scheme are bellow.



    Java code:



    package socket;
    import javax.websocket.OnClose;
    import javax.websocket.OnError;
    import javax.websocket.OnMessage;
    import javax.websocket.OnOpen;
    import javax.websocket.server.ServerEndpoint;

    @ServerEndpoint("/ws")
    public class WebSocketServerExample {
    @OnOpen
    public void onOpen(){
    System.out.println("Open Connection ...");
    }

    @OnClose
    public void onClose(){
    System.out.println("Close Connection ...");
    }

    @OnMessage
    public String onMessage(String message){
    System.out.println("Message from the client: " + message);
    String echoMsg = "Echo from the server : " + message;
    return echoMsg;
    }

    @OnError
    public void onError(Throwable e){
    e.printStackTrace();
    }
    }


    jsp file:



    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Tomcat WebSocket</title>
    </head>
    <body>
    <form>
    <input id="message" type="text">
    <input onclick="wsSendMessage();" value="Echo" type="button">
    <input onclick="wsCloseConnection();" value="Disconnect" type="button">
    </form>
    <br>
    <textarea id="echoText" rows="5" cols="30"></textarea>
    <script type="text/javascript">
    var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws");
    var echoText = document.getElementById("echoText");
    echoText.value = "";
    var message = document.getElementById("message");
    webSocket.onopen = function(message){ wsOpen(message);};
    webSocket.onmessage = function(message){ wsGetMessage(message);};
    webSocket.onclose = function(message){ console.log(message);};
    webSocket.onerror = function(message){ console.log(message);};
    function wsOpen(message){
    echoText.value += "Connected ... n";
    }
    function wsSendMessage(){
    webSocket.send(message.value);
    echoText.value += "Message sended to the server : " + message.value + "n";
    message.value = "";
    }
    function wsCloseConnection(){
    webSocket.close();
    }
    function wsGetMessage(message){
    echoText.value += "Message received from to the server : " + message.data + "n";
    }
    function wsClose(message){
    echoText.value += "Disconnect ... n";
    }

    function wserror(message){
    echoText.value += "Error ... n";
    }
    </script>
    </body>
    </html>


    Scheme of the Project










    share|improve this question
























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I'm t rying to make my the first simple client-servet application with web socket and tomcat 9 server. I found this example in the enternet. I had the next error:



      (index):17 WebSocket connection to 'ws://localhost:8080/JavaWebSocket/ws' failed: 


      Error during WebSocket handshake: Unexpected response code: 404"



      it's this line:



      var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws")" 


      I thought the initialisation should be



       var webSocket = new WebSocket("ws://localhost:8080/[nameOfTheClassWithWebSocket]/ws");


      But it doesn't work too :( I tried everything :( I can't solve this problem :(



      Java code and Jsp file with project scheme are bellow.



      Java code:



      package socket;
      import javax.websocket.OnClose;
      import javax.websocket.OnError;
      import javax.websocket.OnMessage;
      import javax.websocket.OnOpen;
      import javax.websocket.server.ServerEndpoint;

      @ServerEndpoint("/ws")
      public class WebSocketServerExample {
      @OnOpen
      public void onOpen(){
      System.out.println("Open Connection ...");
      }

      @OnClose
      public void onClose(){
      System.out.println("Close Connection ...");
      }

      @OnMessage
      public String onMessage(String message){
      System.out.println("Message from the client: " + message);
      String echoMsg = "Echo from the server : " + message;
      return echoMsg;
      }

      @OnError
      public void onError(Throwable e){
      e.printStackTrace();
      }
      }


      jsp file:



      <%@ page contentType="text/html;charset=UTF-8" language="java" %>
      <html>
      <head>
      <meta charset="UTF-8">
      <title>Tomcat WebSocket</title>
      </head>
      <body>
      <form>
      <input id="message" type="text">
      <input onclick="wsSendMessage();" value="Echo" type="button">
      <input onclick="wsCloseConnection();" value="Disconnect" type="button">
      </form>
      <br>
      <textarea id="echoText" rows="5" cols="30"></textarea>
      <script type="text/javascript">
      var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws");
      var echoText = document.getElementById("echoText");
      echoText.value = "";
      var message = document.getElementById("message");
      webSocket.onopen = function(message){ wsOpen(message);};
      webSocket.onmessage = function(message){ wsGetMessage(message);};
      webSocket.onclose = function(message){ console.log(message);};
      webSocket.onerror = function(message){ console.log(message);};
      function wsOpen(message){
      echoText.value += "Connected ... n";
      }
      function wsSendMessage(){
      webSocket.send(message.value);
      echoText.value += "Message sended to the server : " + message.value + "n";
      message.value = "";
      }
      function wsCloseConnection(){
      webSocket.close();
      }
      function wsGetMessage(message){
      echoText.value += "Message received from to the server : " + message.data + "n";
      }
      function wsClose(message){
      echoText.value += "Disconnect ... n";
      }

      function wserror(message){
      echoText.value += "Error ... n";
      }
      </script>
      </body>
      </html>


      Scheme of the Project










      share|improve this question













      I'm t rying to make my the first simple client-servet application with web socket and tomcat 9 server. I found this example in the enternet. I had the next error:



      (index):17 WebSocket connection to 'ws://localhost:8080/JavaWebSocket/ws' failed: 


      Error during WebSocket handshake: Unexpected response code: 404"



      it's this line:



      var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws")" 


      I thought the initialisation should be



       var webSocket = new WebSocket("ws://localhost:8080/[nameOfTheClassWithWebSocket]/ws");


      But it doesn't work too :( I tried everything :( I can't solve this problem :(



      Java code and Jsp file with project scheme are bellow.



      Java code:



      package socket;
      import javax.websocket.OnClose;
      import javax.websocket.OnError;
      import javax.websocket.OnMessage;
      import javax.websocket.OnOpen;
      import javax.websocket.server.ServerEndpoint;

      @ServerEndpoint("/ws")
      public class WebSocketServerExample {
      @OnOpen
      public void onOpen(){
      System.out.println("Open Connection ...");
      }

      @OnClose
      public void onClose(){
      System.out.println("Close Connection ...");
      }

      @OnMessage
      public String onMessage(String message){
      System.out.println("Message from the client: " + message);
      String echoMsg = "Echo from the server : " + message;
      return echoMsg;
      }

      @OnError
      public void onError(Throwable e){
      e.printStackTrace();
      }
      }


      jsp file:



      <%@ page contentType="text/html;charset=UTF-8" language="java" %>
      <html>
      <head>
      <meta charset="UTF-8">
      <title>Tomcat WebSocket</title>
      </head>
      <body>
      <form>
      <input id="message" type="text">
      <input onclick="wsSendMessage();" value="Echo" type="button">
      <input onclick="wsCloseConnection();" value="Disconnect" type="button">
      </form>
      <br>
      <textarea id="echoText" rows="5" cols="30"></textarea>
      <script type="text/javascript">
      var webSocket = new WebSocket("ws://localhost:8080/JavaWebSocket/ws");
      var echoText = document.getElementById("echoText");
      echoText.value = "";
      var message = document.getElementById("message");
      webSocket.onopen = function(message){ wsOpen(message);};
      webSocket.onmessage = function(message){ wsGetMessage(message);};
      webSocket.onclose = function(message){ console.log(message);};
      webSocket.onerror = function(message){ console.log(message);};
      function wsOpen(message){
      echoText.value += "Connected ... n";
      }
      function wsSendMessage(){
      webSocket.send(message.value);
      echoText.value += "Message sended to the server : " + message.value + "n";
      message.value = "";
      }
      function wsCloseConnection(){
      webSocket.close();
      }
      function wsGetMessage(message){
      echoText.value += "Message received from to the server : " + message.data + "n";
      }
      function wsClose(message){
      echoText.value += "Disconnect ... n";
      }

      function wserror(message){
      echoText.value += "Error ... n";
      }
      </script>
      </body>
      </html>


      Scheme of the Project







      java tomcat websocket






      share|improve this question













      share|improve this question











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      asked Nov 9 at 21:59









      Mark Andriewski

      61




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