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I'm working on a Java JEE application using WebSocket with a Tomcat 10.1 server. My goal is to create a one-player (host) game via a WebSocket and allow other players to join this game in real time locally by replacing “localhost” with the host player's ipv4. However, I'm running into a problem: the onMessage method in my WebSocket class never fires, even when I send a message from the client.

Here is my lobby.jsp page which has 2 buttons create and join.

lobby.jsp :

<body> Bienvenue, <%= username %>! Choisissez une option pour continuer :
<form action="createGameSocket" method="POST" style="display:inline;">
    <button type="submit" class="button">Create Game</button>
</form>

<button onclick="joinGame(event)" class="button">Join Game</button>

<script>
function joinGame(event) {
    event.preventDefault();
    window.location.href = "joinGame.jsp";
}
</script>

when I press "create Game" I get this :

CreateGameServlet:

package controller;

import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import jakarta.servlet.http.HttpSession;

import java.io.IOException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement;

@WebServlet("/createGameSocket") public class CreateGameServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    HttpSession session = request.getSession();
    String username = (String) session.getAttribute("username");

    if (username == null) {
        response.sendRedirect("index.jsp");
        return;
    }

    
    String gameCode = java.util.UUID.randomUUID().toString().substring(0, 6).toUpperCase();
    session.setAttribute("gameCode", gameCode);
    System.out.println("Voici le gameCode : " + gameCode);

    try {
       
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/game_db", "root", "test");

       
        String insertQuery = "INSERT INTO games (host_player_id, code, status) VALUES (?, ?, ?)";
        PreparedStatement stmt = conn.prepareStatement(insertQuery);

       
        int hostPlayerId = 1; // À modifier pour récupérer l'ID réel de l'utilisateur connecté
        stmt.setInt(1, hostPlayerId);
        stmt.setString(2, gameCode);
        stmt.setString(3, "waiting");
        stmt.executeUpdate();

        
        stmt.close();
        conn.close();

       
        response.sendRedirect("createGame.jsp?code=" + gameCode);
    } catch (Exception e) {
        e.printStackTrace();
        response.getWriter().println("Erreur lors de la création de la partie : " + e.getMessage());
    }
}
}

which will call the createGame script:

createGame.jsp

<!DOCTYPE html>
    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <title>Créer une partie</title>
    <h1>Partie créée avec succès</h1>
    <p>Attendez que les joueurs se connectent, puis démarrez la partie.</p>
    
    <form action="startGame.jsp" method="POST">
        <button type="submit" class="button">Démarrer la partie</button>
    </form>
    
    <h1>Partie créée avec succès</h1>
    <p>Donnez ces informations aux joueurs pour qu'ils se connectent :</p>
    <p class="info" >Adresse IPv4 : 192.168.56.1</p>
    <p class="info" >Code de la partie : <%= request.getParameter("code") %></p>
    <p class="info" >Joueurs connectés : <span id="players"></span></p>
    
    <script>
        const gameCode = "<%= request.getParameter("code") %>";
        const socket = new WebSocket("ws://192.168.56.1:8080/gameSocket");
    
        socket.onopen = () => {
            console.log("Connexion WebSocket ouverte");
            socket.send(JSON.stringify({ type: "host", gameCode: gameCode }));
        };
    
        socket.onmessage = (event) => {
            console.log("Message reçu : ", event.data);
            const data = JSON.parse(event.data);
            if (data.message) {
                document.getElementById("players").textContent = data.message;
            }
        };
    
        socket.onerror = (error) => {
            console.error("Erreur WebSocket : ", error);
        };
    
        socket.onclose = () => {
            console.log("Connexion WebSocket fermée");
        };
    
        function startGame() {
            console.log("Partie démarrée !");
            
        }
    </script>

just in case : web.xml :

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="; 
         xmlns:xsi="; 
         xsi:schemaLocation=" .xsd" 
         version="5.0">
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.jsp</welcome-file>
        <welcome-file>default.htm</welcome-file>
    </welcome-file-list>
</web-app>

本文标签： Websocket always closed using Tomcat 101 in Java JEEStack Overflow

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