java - Why isn't my website working? I load the servlet, and it loads incorrectly in Eclipse - Stack Overflow

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Basically, I have a simple servlet. Let me explain.

I have Eclipse 2025-03.

I have Tomcat 11.

The project is a web project, but it's updated with Maven.

I run the servlet and it opens this website: http://localhost:8100/Web_De_Productos_Dos/servlet/com.pildorasinformaticas.productos.ServletPruebas. Before, when it was working fine, I would run the servlet and it would open this website: http://localhost:8100/Web_De_Productos_Dos/ServletPruebas

What's more, if I manually set the second website, it opens fine, loads fine, and everything works fine... but running it from Eclipse opens the first website and it doesn't work, giving me a 404 error. This is my servlet:

package com.pildorasinformaticas.productos;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.sql.Connection;
    import java.sql.ResultSet;
    import java.sql.Statement;
    
    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 javax.sql.*;
    
    import jakarta.annotation.Resource;
    
    
    
    /**
     * Servlet implementation class ServletPruebas
     */
    @WebServlet("/ServletPruebas")
    public class ServletPruebas extends HttpServlet {
        private static final long serialVersionUID = 1L;
        
        //definir o establecer el dataSource
        
        @Resource(name="jdbc/Productos")
        private DataSource miPool;
        /**
         * @see HttpServlet#HttpServlet()
         */
        public ServletPruebas() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            //response.getWriter().append("Served at: ").append(request.getContextPath());
            
            // crear el objeto printWriter
            
            PrintWriter salida = response.getWriter();
            
            response.setContentType("text/plain");
            
            //crear conexion con bbdd
            
            Connection miConexion = null;
            
            Statement miStatement = null;
            
            ResultSet miResultSet = null;
            
            try {
                miConexion = miPool.getConnection();
                
                String mySql = "SELECT * FROM PRODUCTOS";
                miStatement = miConexion.createStatement();
                miResultSet = miStatement.executeQuery(mySql); 
                
                while(miResultSet.next()) {
                    String nombre_articulo = miResultSet.getString(3);
                    salida.println(nombre_articulo);
                }
                
            }catch(Exception e) {
                
                e.printStackTrace();
            }
            
        }
    
        /**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            doGet(request, response);
        }
    
    }

this is my pom.xml:

<project xmlns=".0.0" xmlns:xsi="; xsi:schemaLocation=".0.0 .0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>Web_De_Productos_Dos</groupId>
      <artifactId>Web_De_Productos_Dos</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>war</packaging>
      
      <dependencies>
      
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.29</version> <!-- Verifica la última versión disponible -->
    </dependency>
    
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.3</version>
        <scope>provided</scope>
    </dependency>
    
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    
    <dependency>
        <groupId>jakarta.servlet</groupId>
        <artifactId>jakarta.servlet-api</artifactId>
        <version>5.0.0</version>
        <scope>provided</scope>
    </dependency>
    
    <dependency>
        <groupId>jakarta.servlet.jsp.jstl</groupId>
        <artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
        <version>2.0.0</version>
    </dependency>
    
    <dependency>
        <groupId>.glassfish.web</groupId>
        <artifactId>jakarta.servlet.jsp.jstl</artifactId>
        <version>2.0.0</version>
    </dependency>
    </dependencies>
      <build>
        <plugins>
          <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.3</version>
          </plugin>
          <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.13.0</version>
            <configuration>
              <release>24</release>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </project>

this is my context.xml set on META-INF:

<?xml version="1.0" encoding="UTF-8"?>
    <Context>
        <!-- Aquí puedes configurar recursos si es necesario -->
        <Resource name="jdbc/Productos" auth="Container" type="javax.sql.DataSource" maxTotal="15" maxIdle="3" maxWaitMillis="5000" username="root" password="" driverClassName="com.mysql.cj.jdbc.Driver" url="jdbc:mysql://localhost:3306/curso_sql">
        
        </Resource>
        
    </Context>

this is my web.xml set on WEB-INF:

<?xml version="1.0" encoding="UTF-8"?>
    <web-app id="WebApp_ID" version="2.4" xmlns="; xmlns:xsi="; xsi:schemaLocation=" .xsd">
        <display-name>Web_De_Productos_Dos</display-name>
        <welcome-file-list>
            <welcome-file>index.html</welcome-file>
            <welcome-file>index.htm</welcome-file>
            <welcome-file>index.jsp</welcome-file>
            <welcome-file>default.html</welcome-file>
            <welcome-file>default.htm</welcome-file>
            <welcome-file>default.jsp</welcome-file>
        </welcome-file-list>
        
        <resource-ref>
            <description>Base de datos MySQL</description>
            <res-ref-name>jdbc/Productos</res-ref-name>
            <res-type>javax.sql.DataSource</res-type>
            <res-auth>Container</res-auth>
        </resource-ref>
    </web-app>

If you need more information, let me know and I'll upload it, but I think that's all... Now I'll tell you, it all started when I was running the servlet and the website wouldn't even open, when 2 minutes ago everything was working fine, without modifying anything. So what did I do? Since the website wouldn't open, I went to project properties, searched for project facets, and changed the web dynamic version to version 4.0 while I was on 2.4, and I changed Java 21 while I was on Java 24. From that moment on, this started happening to me... then I reverted it, left everything as it was, but it still fails... Since that change, everything has been ruined.

I tried changing the versions of the facets and that broke my code seemsly. Like I said my servlet was working fine till that change...

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