tomcat 连接mysql失败

<Resource name="jdbc/MyDB" auth="Container"
          type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://localhost:3306/mydatabase"
          username="myuser" password="mypassword" maxActive="20" maxIdle="10"
          maxWait="-1"/>

GRANT ALL PRIVILEGES ON mydatabase.* TO 'myuser'@'localhost' IDENTIFIED BY 'mypassword';
FLUSH PRIVILEGES;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MySQLConnectionTest {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "myuser";
        String password = "mypassword";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            System.out.println("Connected to the database!");
        } catch (SQLException e) {
            System.out.println("Failed to connect to the database.");
            e.printStackTrace();
        }
    }
}