JAVA-SPRING - Error java.lang.ClassNotFoundException: "com.mysql.jdbc.Driver" Upon Putting My Connection to Other Class but working on the Main

While practicing Spring framework, I want my JDBC Connection to be on external class. However, upon creating the object on my main method and calling the .connectToDB() method, I keep on getting this kind of error:

java.lang.ClassNotFoundException: "com.mysql.jdbc.Driver"

This is my code:

DBConnection.java (Class with dependencies)

package com.jrs.annotation;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Value;

public class DBConnection {
	@Value("${mysql.driver}")
	private String driver;
	
	@Value("${mysql.url}")
	private String url;
	
	@Value("${mysql.password}")
	private String password;
	
	@Value("${mysql.username}")
	private String username;
	
	public void displayConnection(){
		System.out.println("Driver: " + this.driver + "\nURL: "+ this.url + "\nUsername" + this.username + "\nPassword" + this.password);
	}
	
	
	public void connectToDB() throws SQLException, ClassNotFoundException {
		Class.forName(this.driver);
		Connection con = DriverManager.getConnection(url, username, password);
		System.out.println("Connection has been established");
	}
}

Client.java (My class for main method)

package com.jrs.annotation;

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

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Client {

	public static void main(String[] args) throws Exception {
		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
		DBConnection con = context.getBean("dbconnection",DBConnection.class);
		con.displayConnection();
		con.connectToDB();
	}
}

connection_details.properties (Values for the database connection)

mysql.driver  = "com.mysql.jdbc.Driver"
mysql.url     = "jdbc:mysql://127.0.0.1:3306/school"
mysql.username= "root"
mysql.password= ""

beans.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <context:annotation-config/>
    
    <context:property-placeholder location="connection_details.properties" />
	<bean id = "dbconnection" class = "com.jrs.annotation.DBConnection">
	</bean>
</beans>

I've tried to do the connection code on my Main method and it's working. I got only that kind of error when I put it on a method from an external class and call it on my main. Is there anything that I missed to include?

Thank you.

SOLUTION:
I've already found what's going wrong with this, values on the connection_details.properties doesn't need a single or double quote. Thank you for your ideas.

Correct Code for connection_details.properties

mysql.driver  = com.mysql.jdbc.Driver
mysql.url     = jdbc:mysql://127.0.0.1:3306/school
mysql.username= root
mysql.password= 

When the class com.mysql.jdbc.Driver is not found, it means that it is not available at runtime. Please check if the MySQL java connector is available in your build.gradle or pom.xml, and if it is not, then please add it:
https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.21