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

asked Nov 9 at 21:59

Mark Andriewski

add a comment |

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

asked Nov 9 at 21:59

Mark Andriewski

add a comment |

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

asked Nov 9 at 21:59

Mark Andriewski

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

asked Nov 9 at 21:59

Mark Andriewski

asked Nov 9 at 21:59

Mark Andriewski

asked Nov 9 at 21:59

Mark Andriewski

asked Nov 9 at 21:59

Mark Andriewski

asked Nov 9 at 21:59

Mark Andriewski

add a comment |

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