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
java tomcat websocket
asked Nov 9 at 21:59
Mark Andriewski
61
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
java tomcat websocket
asked Nov 9 at 21:59
Mark Andriewski
61
add a comment |
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
java tomcat websocket
asked Nov 9 at 21:59
Mark Andriewski
61
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
java tomcat websocket
asked Nov 9 at 21:59
Mark Andriewski
61
asked Nov 9 at 21:59
Mark Andriewski
61
asked Nov 9 at 21:59
Mark Andriewski
61
asked Nov 9 at 21:59
Mark Andriewski
61
asked Nov 9 at 21:59
Mark Andriewski
61
61
add a comment |
add a comment |
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