Java Maven ClassNotFoundException: com.mysql.cj.jdbc.Driver

Question

I am currently testing my database connection:

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.DriverManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

@WebServlet("/servlet/casillano.testdb.TestDbServlet")
public class TestDbServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String user="";
        String pass="";

        String url="jdbc:mysql://localhost:3306/birthday-wishlist-db?useSSL=false&serverTimezone=UTC";
        String driver = "com.mysql.cj.jdbc.Driver";

        try {
            PrintWriter out = response.getWriter();
            out.println("Connection to databse: " + url);
            Class.forName(driver);
            Connection conn = DriverManager.getConnection(url, user, pass);
            out.println("Connection successful");
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
            throw new ServletException(e);
        }

    }
}

It was successful at first, but after a while, a red x popped up on my project and nowhere else. When I tried running this code again, I got a ClassNotFoundException.

My pom.xml contains the mysql dependency:

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>

So I'm not sure what's wrong. I tried cleaning and doing a Maven update on the project, but nothing worked.