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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